XML 72 R61.htm IDEA: XBRL DOCUMENT
v3.21.2

Note 8 - Loans - Loan Held for Investment by Loan Portfolio Segments, Internal Risk Ratings and Vintage Year (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Total, Loans Amortized Cost Basis by Origination Year 2021 | $ 2,718,670 |  | $ 2,718,670 |
Total, Loans Amortized Cost Basis by Origination Year 2020 | 2,536,318 |  | 2,536,318 |
Total, Loans Amortized Cost Basis by Origination Year 2019 | 2,519,191 |  | 2,519,191 |
Total, Loans Amortized Cost Basis by Origination Year 2018 | 2,077,723 |  | 2,077,723 |
Total, Loans Amortized Cost Basis by Origination Year 2017 | 1,467,702 |  | 1,467,702 |
Total, Loans Amortized Cost Basis by Origination Year Prior | 2,694,915 |  | 2,694,915 |
Total, Revolving Loans | 1,912,472 |  | 1,912,472 |
Total, Revolving Converted to Term Loans | 45,955 |  | 45,955 |
Total loans | 15,972,946 |  | 15,972,946 |
YTD period charge-offs, Loans Amortized Cost Basis by Origination Year 2021 |  |  | 0 |
YTD period charge-offs | 2,652 | $ 6,956 | 19,502 | $ 13,383
YTD period recoveries | (341) | (3,906) | (2,179) | (6,789)
Net, Loans Amortized Cost Basis by Origination Year 2020 |  |  | 927 |
Net, Loans Amortized Cost Basis by Origination Year 2019 |  |  | 327 |
Net, Loans Amortized Cost Basis by Origination Year 2018 |  |  | 291 |
Net, Loans Amortized Cost Basis by Origination Year 2017 |  |  | 3 |
Net, Loans Amortized Cost Basis by Origination Year Prior |  |  | (424) |
Net, Revolving Loans |  |  | 16,257 |
Net, Revolving Converted to Term Loans |  |  | (58) |
Net | 2,311 | 3,050 | 17,323 | 6,594
Commercial Portfolio Segment [Member] |  |  |  |
Total, Loans Amortized Cost Basis by Origination Year 2021 | 552,203 |  | 552,203 |
Total, Loans Amortized Cost Basis by Origination Year 2020 | 316,800 |  | 316,800 |
Total, Loans Amortized Cost Basis by Origination Year 2019 | 272,338 |  | 272,338 |
Total, Loans Amortized Cost Basis by Origination Year 2018 | 207,322 |  | 207,322 |
Total, Loans Amortized Cost Basis by Origination Year 2017 | 103,527 |  | 103,527 |
Total, Loans Amortized Cost Basis by Origination Year Prior | 74,673 |  | 74,673 |
Total, Revolving Loans | 1,329,377 |  | 1,329,377 |
Total, Revolving Converted to Term Loans | 13,828 |  | 13,828 |
Total loans | 2,870,068 |  | 2,870,068 |
YTD period charge-offs, Loans Amortized Cost Basis by Origination Year 2021 |  |  | 0 |
YTD period charge-offs, Loans Amortized Cost Basis by Origination Year 2020 |  |  | 927 |
YTD period charge-offs, Loans Amortized Cost Basis by Origination Year 2019 |  |  | 507 |
YTD period charge-offs, Loans Amortized Cost Basis by Origination Year 2018 |  |  | 366 |
YTD period charge-offs, Loans Amortized Cost Basis by Origination Year 2017 |  |  | 0 |
YTD period charge-offs, Loans Amortized Cost Basis by Origination Year Prior |  |  | 50 |
YTD period charge-offs, Revolving Loans |  |  | 17,649 |
YTD period charge-offs, Revolving Converted to Term Loans |  |  | 0 |
YTD period charge-offs | 2,649 | 6,956 | 19,499 | 13,383
YTD period recoveries, Loans Amortized Cost Basis by Origination Year 2021 |  |  | 0 |
YTD period recoveries, Loans Amortized Cost Basis by Origination Year 2020 |  |  | 0 |
YTD period recoveries, Loans Amortized Cost Basis by Origination Year 2019 |  |  | 0 |
YTD period recoveries, Loans Amortized Cost Basis by Origination Year 2018 |  |  | (75) |
YTD period recoveries, Loans Amortized Cost Basis by Origination Year 2017 |  |  | 0 |
YTD period recoveries, Loans Amortized Cost Basis by Origination Year Prior |  |  | (169) |
YTD period recoveries, Revolving Loans |  |  | (1,301) |
YTD period recoveries, Revolving Converted to Term Loans |  |  | 0 |
YTD period recoveries | (121) | (3,796) | (1,545) | (6,354)
Net, Loans Amortized Cost Basis by Origination Year 2021 |  |  | 0 |
Net, Loans Amortized Cost Basis by Origination Year 2020 |  |  | 927 |
Net, Loans Amortized Cost Basis by Origination Year 2019 |  |  | 507 |
Net, Loans Amortized Cost Basis by Origination Year 2018 |  |  | 291 |
Net, Loans Amortized Cost Basis by Origination Year 2017 |  |  | 0 |
Net, Loans Amortized Cost Basis by Origination Year Prior |  |  | (119) |
Net, Revolving Loans |  |  | 16,348 |
Net, Revolving Converted to Term Loans |  |  | 0 |
Net | 2,528 | 3,160 | 17,954 | 7,029
Commercial Portfolio Segment [Member] | Pass [Member] |  |  |  |
Total, Loans Amortized Cost Basis by Origination Year 2021 | 552,079 |  | 552,079 |
Total, Loans Amortized Cost Basis by Origination Year 2020 | 309,944 |  | 309,944 |
Total, Loans Amortized Cost Basis by Origination Year 2019 | 245,936 |  | 245,936 |
Total, Loans Amortized Cost Basis by Origination Year 2018 | 188,790 |  | 188,790 |
Total, Loans Amortized Cost Basis by Origination Year 2017 | 87,579 |  | 87,579 |
Total, Loans Amortized Cost Basis by Origination Year Prior | 69,354 |  | 69,354 |
Total, Revolving Loans | 1,266,946 |  | 1,266,946 |
Total, Revolving Converted to Term Loans | 7,650 |  | 7,650 |
Total loans | 2,728,278 |  | 2,728,278 |
Commercial Portfolio Segment [Member] | Special Mention [Member] |  |  |  |
Total, Loans Amortized Cost Basis by Origination Year 2021 | 93 |  | 93 |
Total, Loans Amortized Cost Basis by Origination Year 2020 | 570 |  | 570 |
Total, Loans Amortized Cost Basis by Origination Year 2019 | 4,506 |  | 4,506 |
Total, Loans Amortized Cost Basis by Origination Year 2018 | 1,703 |  | 1,703 |
Total, Loans Amortized Cost Basis by Origination Year 2017 | 2,871 |  | 2,871 |
Total, Loans Amortized Cost Basis by Origination Year Prior | 0 |  | 0 |
Total, Revolving Loans | 22,073 |  | 22,073 |
Total, Revolving Converted to Term Loans | 89 |  | 89 |
Total loans | 31,905 |  | 31,905 |
Commercial Portfolio Segment [Member] | Substandard [Member] |  |  |  |
Total, Loans Amortized Cost Basis by Origination Year 2021 | 31 |  | 31 |
Total, Loans Amortized Cost Basis by Origination Year 2020 | 6,286 |  | 6,286 |
Total, Loans Amortized Cost Basis by Origination Year 2019 | 21,896 |  | 21,896 |
Total, Loans Amortized Cost Basis by Origination Year 2018 | 16,829 |  | 16,829 |
Total, Loans Amortized Cost Basis by Origination Year 2017 | 13,077 |  | 13,077 |
Total, Loans Amortized Cost Basis by Origination Year Prior | 5,319 |  | 5,319 |
Total, Revolving Loans | 39,457 |  | 39,457 |
Total, Revolving Converted to Term Loans | 6,089 |  | 6,089 |
Total loans | 108,984 |  | 108,984 |
Commercial Portfolio Segment [Member] | Doubtful [Member] |  |  |  |
Total, Loans Amortized Cost Basis by Origination Year 2021 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2020 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2019 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2018 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2017 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year Prior | 0 |  | 0 |
Total, Revolving Loans | 901 |  | 901 |
Total, Revolving Converted to Term Loans | 0 |  | 0 |
Total loans | 901 |  | 901 |
Commercial Portfolio Segment [Member] | Unlikely to be Collected Financing Receivable [Member] |  |  |  |
Total, Loans Amortized Cost Basis by Origination Year 2021 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2020 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2019 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2018 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2017 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year Prior | 0 |  | 0 |
Total, Revolving Loans | 0 |  | 0 |
Total, Revolving Converted to Term Loans | 0 |  | 0 |
Total loans | 0 |  | 0 |
Real Estate Construction Portfolio Segment [Member] |  |  |  |
Total, Loans Amortized Cost Basis by Origination Year 2021 | 165,129 |  | 165,129 |
Total, Loans Amortized Cost Basis by Origination Year 2020 | 235,970 |  | 235,970 |
Total, Loans Amortized Cost Basis by Origination Year 2019 | 167,770 |  | 167,770 |
Total, Loans Amortized Cost Basis by Origination Year 2018 | 82,214 |  | 82,214 |
Total, Loans Amortized Cost Basis by Origination Year 2017 | 30,272 |  | 30,272 |
Total, Loans Amortized Cost Basis by Origination Year Prior | 4,066 |  | 4,066 |
Total, Revolving Loans | 0 |  | 0 |
Total, Revolving Converted to Term Loans | 0 |  | 0 |
Total loans | 685,421 |  | 685,421 |
YTD period charge-offs, Loans Amortized Cost Basis by Origination Year 2021 |  |  | 0 |
YTD period charge-offs, Loans Amortized Cost Basis by Origination Year 2020 |  |  | 0 |
YTD period charge-offs, Loans Amortized Cost Basis by Origination Year 2019 |  |  | 0 |
YTD period charge-offs, Loans Amortized Cost Basis by Origination Year 2018 |  |  | 0 |
YTD period charge-offs, Loans Amortized Cost Basis by Origination Year 2017 |  |  | 0 |
YTD period charge-offs, Loans Amortized Cost Basis by Origination Year Prior |  |  | 0 |
YTD period charge-offs, Revolving Loans |  |  | 0 |
YTD period charge-offs, Revolving Converted to Term Loans |  |  | 0 |
YTD period charge-offs | (0) | (0) | 0 | (0)
YTD period recoveries, Loans Amortized Cost Basis by Origination Year 2021 |  |  | 0 |
YTD period recoveries, Loans Amortized Cost Basis by Origination Year 2020 |  |  | 0 |
YTD period recoveries, Loans Amortized Cost Basis by Origination Year 2019 |  |  | 0 |
YTD period recoveries, Loans Amortized Cost Basis by Origination Year 2018 |  |  | 0 |
YTD period recoveries, Loans Amortized Cost Basis by Origination Year 2017 |  |  | 0 |
YTD period recoveries, Loans Amortized Cost Basis by Origination Year Prior |  |  | (76) |
YTD period recoveries, Revolving Loans |  |  | 0 |
YTD period recoveries, Revolving Converted to Term Loans |  |  | 0 |
YTD period recoveries | (76) | 0 | (76) | 0
Net, Loans Amortized Cost Basis by Origination Year 2021 |  |  | 0 |
Net, Loans Amortized Cost Basis by Origination Year 2020 |  |  | 0 |
Net, Loans Amortized Cost Basis by Origination Year 2019 |  |  | 0 |
Net, Loans Amortized Cost Basis by Origination Year 2018 |  |  | 0 |
Net, Loans Amortized Cost Basis by Origination Year 2017 |  |  | 0 |
Net, Loans Amortized Cost Basis by Origination Year Prior |  |  | (76) |
Net, Revolving Loans |  |  | 0 |
Net, Revolving Converted to Term Loans |  |  | 0 |
Net | (76) | (0) | (76) | (0)
Real Estate Construction Portfolio Segment [Member] | Pass [Member] |  |  |  |
Total, Loans Amortized Cost Basis by Origination Year 2021 | 160,357 |  | 160,357 |
Total, Loans Amortized Cost Basis by Origination Year 2020 | 213,737 |  | 213,737 |
Total, Loans Amortized Cost Basis by Origination Year 2019 | 152,626 |  | 152,626 |
Total, Loans Amortized Cost Basis by Origination Year 2018 | 64,908 |  | 64,908 |
Total, Loans Amortized Cost Basis by Origination Year 2017 | 30,272 |  | 30,272 |
Total, Loans Amortized Cost Basis by Origination Year Prior | 0 |  | 0 |
Total, Revolving Loans | 0 |  | 0 |
Total, Revolving Converted to Term Loans | 0 |  | 0 |
Total loans | 621,900 |  | 621,900 |
Real Estate Construction Portfolio Segment [Member] | Special Mention [Member] |  |  |  |
Total, Loans Amortized Cost Basis by Origination Year 2021 | 4,772 |  | 4,772 |
Total, Loans Amortized Cost Basis by Origination Year 2020 | 22,233 |  | 22,233 |
Total, Loans Amortized Cost Basis by Origination Year 2019 | 11,800 |  | 11,800 |
Total, Loans Amortized Cost Basis by Origination Year 2018 | 17,306 |  | 17,306 |
Total, Loans Amortized Cost Basis by Origination Year 2017 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year Prior | 0 |  | 0 |
Total, Revolving Loans | 0 |  | 0 |
Total, Revolving Converted to Term Loans | 0 |  | 0 |
Total loans | 56,111 |  | 56,111 |
Real Estate Construction Portfolio Segment [Member] | Substandard [Member] |  |  |  |
Total, Loans Amortized Cost Basis by Origination Year 2021 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2020 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2019 | 3,344 |  | 3,344 |
Total, Loans Amortized Cost Basis by Origination Year 2018 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2017 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year Prior | 4,066 |  | 4,066 |
Total, Revolving Loans | 0 |  | 0 |
Total, Revolving Converted to Term Loans | 0 |  | 0 |
Total loans | 7,410 |  | 7,410 |
Real Estate Construction Portfolio Segment [Member] | Doubtful [Member] |  |  |  |
Total, Loans Amortized Cost Basis by Origination Year 2021 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2020 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2019 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2018 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2017 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year Prior | 0 |  | 0 |
Total, Revolving Loans | 0 |  | 0 |
Total, Revolving Converted to Term Loans | 0 |  | 0 |
Total loans | 0 |  | 0 |
Real Estate Construction Portfolio Segment [Member] | Unlikely to be Collected Financing Receivable [Member] |  |  |  |
Total, Loans Amortized Cost Basis by Origination Year 2021 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2020 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2019 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2018 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2017 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year Prior | 0 |  | 0 |
Total, Revolving Loans | 0 |  | 0 |
Total, Revolving Converted to Term Loans | 0 |  | 0 |
Total loans | 0 |  | 0 |
Commercial Real Estate Portfolio Segment [Member] |  |  |  |
Total, Loans Amortized Cost Basis by Origination Year 2021 | 1,276,726 |  | 1,276,726 |
Total, Loans Amortized Cost Basis by Origination Year 2020 | 1,318,699 |  | 1,318,699 |
Total, Loans Amortized Cost Basis by Origination Year 2019 | 1,340,990 |  | 1,340,990 |
Total, Loans Amortized Cost Basis by Origination Year 2018 | 1,239,857 |  | 1,239,857 |
Total, Loans Amortized Cost Basis by Origination Year 2017 | 857,626 |  | 857,626 |
Total, Loans Amortized Cost Basis by Origination Year Prior | 1,618,610 |  | 1,618,610 |
Total, Revolving Loans | 180,864 |  | 180,864 |
Total, Revolving Converted to Term Loans | 0 |  | 0 |
Total loans | 7,833,372 |  | 7,833,372 |
YTD period charge-offs, Loans Amortized Cost Basis by Origination Year 2021 |  |  | 0 |
YTD period charge-offs, Loans Amortized Cost Basis by Origination Year 2020 |  |  | 0 |
YTD period charge-offs, Loans Amortized Cost Basis by Origination Year 2019 |  |  | 0 |
YTD period charge-offs, Loans Amortized Cost Basis by Origination Year 2018 |  |  | 0 |
YTD period charge-offs, Loans Amortized Cost Basis by Origination Year 2017 |  |  | 0 |
YTD period charge-offs, Loans Amortized Cost Basis by Origination Year Prior |  |  | 0 |
YTD period charge-offs, Revolving Loans |  |  | 0 |
YTD period charge-offs, Revolving Converted to Term Loans |  |  | 0 |
YTD period charge-offs | (0) | (0) | 0 | (0)
YTD period recoveries, Loans Amortized Cost Basis by Origination Year 2021 |  |  | 0 |
YTD period recoveries, Loans Amortized Cost Basis by Origination Year 2020 |  |  | 0 |
YTD period recoveries, Loans Amortized Cost Basis by Origination Year 2019 |  |  | (180) |
YTD period recoveries, Loans Amortized Cost Basis by Origination Year 2018 |  |  | 0 |
YTD period recoveries, Loans Amortized Cost Basis by Origination Year 2017 |  |  | 0 |
YTD period recoveries, Loans Amortized Cost Basis by Origination Year Prior |  |  | (21) |
YTD period recoveries, Revolving Loans |  |  | (83) |
YTD period recoveries, Revolving Converted to Term Loans |  |  | 0 |
YTD period recoveries | (144) | (95) | (284) | (345)
Net, Loans Amortized Cost Basis by Origination Year 2021 |  |  | 0 |
Net, Loans Amortized Cost Basis by Origination Year 2020 |  |  | 0 |
Net, Loans Amortized Cost Basis by Origination Year 2019 |  |  | (180) |
Net, Loans Amortized Cost Basis by Origination Year 2018 |  |  | 0 |
Net, Loans Amortized Cost Basis by Origination Year 2017 |  |  | 0 |
Net, Loans Amortized Cost Basis by Origination Year Prior |  |  | (21) |
Net, Revolving Loans |  |  | (83) |
Net, Revolving Converted to Term Loans |  |  | 0 |
Net | (144) | (95) | (284) | (345)
Commercial Real Estate Portfolio Segment [Member] | Pass [Member] |  |  |  |
Total, Loans Amortized Cost Basis by Origination Year 2021 | 1,256,784 |  | 1,256,784 |
Total, Loans Amortized Cost Basis by Origination Year 2020 | 1,266,048 |  | 1,266,048 |
Total, Loans Amortized Cost Basis by Origination Year 2019 | 1,284,803 |  | 1,284,803 |
Total, Loans Amortized Cost Basis by Origination Year 2018 | 1,089,005 |  | 1,089,005 |
Total, Loans Amortized Cost Basis by Origination Year 2017 | 813,707 |  | 813,707 |
Total, Loans Amortized Cost Basis by Origination Year Prior | 1,473,901 |  | 1,473,901 |
Total, Revolving Loans | 177,509 |  | 177,509 |
Total, Revolving Converted to Term Loans | 0 |  | 0 |
Total loans | 7,361,757 |  | 7,361,757 |
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member] |  |  |  |
Total, Loans Amortized Cost Basis by Origination Year 2021 | 18,826 |  | 18,826 |
Total, Loans Amortized Cost Basis by Origination Year 2020 | 52,416 |  | 52,416 |
Total, Loans Amortized Cost Basis by Origination Year 2019 | 45,281 |  | 45,281 |
Total, Loans Amortized Cost Basis by Origination Year 2018 | 104,703 |  | 104,703 |
Total, Loans Amortized Cost Basis by Origination Year 2017 | 42,329 |  | 42,329 |
Total, Loans Amortized Cost Basis by Origination Year Prior | 82,614 |  | 82,614 |
Total, Revolving Loans | 2,499 |  | 2,499 |
Total, Revolving Converted to Term Loans | 0 |  | 0 |
Total loans | 348,668 |  | 348,668 |
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member] |  |  |  |
Total, Loans Amortized Cost Basis by Origination Year 2021 | 1,116 |  | 1,116 |
Total, Loans Amortized Cost Basis by Origination Year 2020 | 235 |  | 235 |
Total, Loans Amortized Cost Basis by Origination Year 2019 | 10,906 |  | 10,906 |
Total, Loans Amortized Cost Basis by Origination Year 2018 | 46,149 |  | 46,149 |
Total, Loans Amortized Cost Basis by Origination Year 2017 | 1,590 |  | 1,590 |
Total, Loans Amortized Cost Basis by Origination Year Prior | 62,095 |  | 62,095 |
Total, Revolving Loans | 856 |  | 856 |
Total, Revolving Converted to Term Loans | 0 |  | 0 |
Total loans | 122,947 |  | 122,947 |
Commercial Real Estate Portfolio Segment [Member] | Doubtful [Member] |  |  |  |
Total, Loans Amortized Cost Basis by Origination Year 2021 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2020 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2019 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2018 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2017 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year Prior | 0 |  | 0 |
Total, Revolving Loans | 0 |  | 0 |
Total, Revolving Converted to Term Loans | 0 |  | 0 |
Total loans | 0 |  | 0 |
Commercial Real Estate Portfolio Segment [Member] | Unlikely to be Collected Financing Receivable [Member] |  |  |  |
Total, Loans Amortized Cost Basis by Origination Year 2021 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2020 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2019 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2018 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2017 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year Prior | 0 |  | 0 |
Total, Revolving Loans | 0 |  | 0 |
Total, Revolving Converted to Term Loans | 0 |  | 0 |
Total loans | 0 |  | 0 |
Residential Portfolio Segment [Member] |  |  |  |
Total, Loans Amortized Cost Basis by Origination Year 2021 | 722,492 |  | 722,492 |
Total, Loans Amortized Cost Basis by Origination Year 2020 | 663,599 |  | 663,599 |
Total, Loans Amortized Cost Basis by Origination Year 2019 | 738,093 |  | 738,093 |
Total, Loans Amortized Cost Basis by Origination Year 2018 | 548,330 |  | 548,330 |
Total, Loans Amortized Cost Basis by Origination Year 2017 | 476,277 |  | 476,277 |
Total, Loans Amortized Cost Basis by Origination Year Prior | 997,559 |  | 997,559 |
Total, Revolving Loans | 0 |  | 0 |
Total, Revolving Converted to Term Loans | 0 |  | 0 |
Total loans | 4,146,350 |  | 4,146,350 |
YTD period charge-offs, Loans Amortized Cost Basis by Origination Year 2021 |  |  | 0 |
YTD period charge-offs, Loans Amortized Cost Basis by Origination Year 2020 |  |  | 0 |
YTD period charge-offs, Loans Amortized Cost Basis by Origination Year 2019 |  |  | 0 |
YTD period charge-offs, Loans Amortized Cost Basis by Origination Year 2018 |  |  | 0 |
YTD period charge-offs, Loans Amortized Cost Basis by Origination Year 2017 |  |  | 3 |
YTD period charge-offs, Loans Amortized Cost Basis by Origination Year Prior |  |  | 0 |
YTD period charge-offs, Revolving Loans |  |  | 0 |
YTD period charge-offs, Revolving Converted to Term Loans |  |  | 0 |
YTD period charge-offs |  |  | 3 |
YTD period recoveries, Loans Amortized Cost Basis by Origination Year 2021 |  |  | 0 |
YTD period recoveries, Loans Amortized Cost Basis by Origination Year 2020 |  |  | 0 |
YTD period recoveries, Loans Amortized Cost Basis by Origination Year 2019 |  |  | 0 |
YTD period recoveries, Loans Amortized Cost Basis by Origination Year 2018 |  |  | 0 |
YTD period recoveries, Loans Amortized Cost Basis by Origination Year 2017 |  |  | 0 |
YTD period recoveries, Loans Amortized Cost Basis by Origination Year Prior |  |  | (208) |
YTD period recoveries, Revolving Loans |  |  | 0 |
YTD period recoveries, Revolving Converted to Term Loans |  |  | 0 |
YTD period recoveries |  |  | (208) |
Net, Loans Amortized Cost Basis by Origination Year 2021 |  |  | 0 |
Net, Loans Amortized Cost Basis by Origination Year 2020 |  |  | 0 |
Net, Loans Amortized Cost Basis by Origination Year 2019 |  |  | 0 |
Net, Loans Amortized Cost Basis by Origination Year 2018 |  |  | 0 |
Net, Loans Amortized Cost Basis by Origination Year 2017 |  |  | 3 |
Net, Loans Amortized Cost Basis by Origination Year Prior |  |  | (208) |
Net, Revolving Loans |  |  | 0 |
Net, Revolving Converted to Term Loans |  |  | 0 |
Net |  |  | (205) |
Residential Portfolio Segment [Member] | Pass [Member] |  |  |  |
Total, Loans Amortized Cost Basis by Origination Year 2021 | 722,013 |  | 722,013 |
Total, Loans Amortized Cost Basis by Origination Year 2020 | 663,292 |  | 663,292 |
Total, Loans Amortized Cost Basis by Origination Year 2019 | 731,803 |  | 731,803 |
Total, Loans Amortized Cost Basis by Origination Year 2018 | 544,362 |  | 544,362 |
Total, Loans Amortized Cost Basis by Origination Year 2017 | 474,271 |  | 474,271 |
Total, Loans Amortized Cost Basis by Origination Year Prior | 992,504 |  | 992,504 |
Total, Revolving Loans | 0 |  | 0 |
Total, Revolving Converted to Term Loans | 0 |  | 0 |
Total loans | 4,128,245 |  | 4,128,245 |
Residential Portfolio Segment [Member] | Special Mention [Member] |  |  |  |
Total, Loans Amortized Cost Basis by Origination Year 2021 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2020 | 140 |  | 140 |
Total, Loans Amortized Cost Basis by Origination Year 2019 | 4,369 |  | 4,369 |
Total, Loans Amortized Cost Basis by Origination Year 2018 | 1,448 |  | 1,448 |
Total, Loans Amortized Cost Basis by Origination Year 2017 | 839 |  | 839 |
Total, Loans Amortized Cost Basis by Origination Year Prior | 589 |  | 589 |
Total, Revolving Loans | 0 |  | 0 |
Total, Revolving Converted to Term Loans | 0 |  | 0 |
Total loans | 7,385 |  | 7,385 |
Residential Portfolio Segment [Member] | Substandard [Member] |  |  |  |
Total, Loans Amortized Cost Basis by Origination Year 2021 | 479 |  | 479 |
Total, Loans Amortized Cost Basis by Origination Year 2020 | 167 |  | 167 |
Total, Loans Amortized Cost Basis by Origination Year 2019 | 1,921 |  | 1,921 |
Total, Loans Amortized Cost Basis by Origination Year 2018 | 2,520 |  | 2,520 |
Total, Loans Amortized Cost Basis by Origination Year 2017 | 1,167 |  | 1,167 |
Total, Loans Amortized Cost Basis by Origination Year Prior | 4,466 |  | 4,466 |
Total, Revolving Loans | 0 |  | 0 |
Total, Revolving Converted to Term Loans | 0 |  | 0 |
Total loans | 10,720 |  | 10,720 |
Residential Portfolio Segment [Member] | Doubtful [Member] |  |  |  |
Total, Loans Amortized Cost Basis by Origination Year 2021 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2020 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2019 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2018 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2017 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year Prior | 0 |  | 0 |
Total, Revolving Loans | 0 |  | 0 |
Total, Revolving Converted to Term Loans | 0 |  | 0 |
Total loans | 0 |  | 0 |
Residential Portfolio Segment [Member] | Unlikely to be Collected Financing Receivable [Member] |  |  |  |
Total, Loans Amortized Cost Basis by Origination Year 2021 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2020 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2019 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2018 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2017 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year Prior | 0 |  | 0 |
Total, Revolving Loans | 0 |  | 0 |
Total, Revolving Converted to Term Loans | 0 |  | 0 |
Total loans | 0 |  | 0 |
Equity Lines Portfolio Segment [Member] |  |  |  |
Total, Loans Amortized Cost Basis by Origination Year 2021 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2020 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2019 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2018 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2017 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year Prior | 7 |  | 7 |
Total, Revolving Loans | 402,231 |  | 402,231 |
Total, Revolving Converted to Term Loans | 32,127 |  | 32,127 |
Total loans | 434,365 |  | 434,365 |
YTD period charge-offs, Loans Amortized Cost Basis by Origination Year 2021 |  |  | 0 |
YTD period charge-offs, Loans Amortized Cost Basis by Origination Year 2020 |  |  | 0 |
YTD period charge-offs, Loans Amortized Cost Basis by Origination Year 2019 |  |  | 0 |
YTD period charge-offs, Loans Amortized Cost Basis by Origination Year 2018 |  |  | 0 |
YTD period charge-offs, Loans Amortized Cost Basis by Origination Year 2017 |  |  | 0 |
YTD period charge-offs, Loans Amortized Cost Basis by Origination Year Prior |  |  | 0 |
YTD period charge-offs, Revolving Loans |  |  | 0 |
YTD period charge-offs, Revolving Converted to Term Loans |  |  | 0 |
YTD period charge-offs |  |  | 0 |
YTD period recoveries, Loans Amortized Cost Basis by Origination Year 2021 |  |  | 0 |
YTD period recoveries, Loans Amortized Cost Basis by Origination Year 2020 |  |  | 0 |
YTD period recoveries, Loans Amortized Cost Basis by Origination Year 2019 |  |  | 0 |
YTD period recoveries, Loans Amortized Cost Basis by Origination Year 2018 |  |  | 0 |
YTD period recoveries, Loans Amortized Cost Basis by Origination Year 2017 |  |  | 0 |
YTD period recoveries, Loans Amortized Cost Basis by Origination Year Prior |  |  | 0 |
YTD period recoveries, Revolving Loans |  |  | (8) |
YTD period recoveries, Revolving Converted to Term Loans |  |  | (58) |
YTD period recoveries |  |  | (66) |
Net, Loans Amortized Cost Basis by Origination Year 2021 |  |  | 0 |
Net, Loans Amortized Cost Basis by Origination Year 2020 |  |  | 0 |
Net, Loans Amortized Cost Basis by Origination Year 2019 |  |  | 0 |
Net, Loans Amortized Cost Basis by Origination Year 2018 |  |  | 0 |
Net, Loans Amortized Cost Basis by Origination Year 2017 |  |  | 0 |
Net, Loans Amortized Cost Basis by Origination Year Prior |  |  | 0 |
Net, Revolving Loans |  |  | (8) |
Net, Revolving Converted to Term Loans |  |  | (58) |
Net |  |  | (66) |
Equity Lines Portfolio Segment [Member] | Pass [Member] |  |  |  |
Total, Loans Amortized Cost Basis by Origination Year 2021 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2020 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2019 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2018 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2017 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year Prior | 7 |  | 7 |
Total, Revolving Loans | 400,991 |  | 400,991 |
Total, Revolving Converted to Term Loans | 31,677 |  | 31,677 |
Total loans | 432,675 |  | 432,675 |
Equity Lines Portfolio Segment [Member] | Special Mention [Member] |  |  |  |
Total, Loans Amortized Cost Basis by Origination Year 2021 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2020 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2019 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2018 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2017 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year Prior | 0 |  | 0 |
Total, Revolving Loans | 0 |  | 0 |
Total, Revolving Converted to Term Loans | 0 |  | 0 |
Total loans | 0 |  | 0 |
Equity Lines Portfolio Segment [Member] | Substandard [Member] |  |  |  |
Total, Loans Amortized Cost Basis by Origination Year 2021 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2020 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2019 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2018 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2017 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year Prior | 0 |  | 0 |
Total, Revolving Loans | 1,240 |  | 1,240 |
Total, Revolving Converted to Term Loans | 450 |  | 450 |
Total loans | 1,690 |  | 1,690 |
Equity Lines Portfolio Segment [Member] | Doubtful [Member] |  |  |  |
Total, Loans Amortized Cost Basis by Origination Year 2021 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2020 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2019 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2018 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2017 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year Prior | 0 |  | 0 |
Total, Revolving Loans | 0 |  | 0 |
Total, Revolving Converted to Term Loans | 0 |  | 0 |
Total loans | 0 |  | 0 |
Equity Lines Portfolio Segment [Member] | Unlikely to be Collected Financing Receivable [Member] |  |  |  |
Total, Loans Amortized Cost Basis by Origination Year 2021 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2020 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2019 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2018 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2017 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year Prior | 0 |  | 0 |
Total, Revolving Loans | 0 |  | 0 |
Total, Revolving Converted to Term Loans | 0 |  | 0 |
Total loans | 0 |  | 0 |
Installment and Other Loans [Member ] |  |  |  |
Total, Loans Amortized Cost Basis by Origination Year 2021 | 2,120 |  | 2,120 |
Total, Loans Amortized Cost Basis by Origination Year 2020 | 1,250 |  | 1,250 |
Total, Loans Amortized Cost Basis by Origination Year 2019 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2018 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2017 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year Prior | 0 |  | 0 |
Total, Revolving Loans | 0 |  | 0 |
Total, Revolving Converted to Term Loans | 0 |  | 0 |
Total loans | 3,370 |  | 3,370 |
YTD period charge-offs, Loans Amortized Cost Basis by Origination Year 2021 |  |  | 0 |
YTD period charge-offs, Loans Amortized Cost Basis by Origination Year 2020 |  |  | 0 |
YTD period charge-offs, Loans Amortized Cost Basis by Origination Year 2019 |  |  | 0 |
YTD period charge-offs, Loans Amortized Cost Basis by Origination Year 2018 |  |  | 0 |
YTD period charge-offs, Loans Amortized Cost Basis by Origination Year 2017 |  |  | 0 |
YTD period charge-offs, Loans Amortized Cost Basis by Origination Year Prior |  |  | 0 |
YTD period charge-offs, Revolving Loans |  |  | 0 |
YTD period charge-offs, Revolving Converted to Term Loans |  |  | 0 |
YTD period charge-offs | (0) | (0) | 0 | (0)
YTD period recoveries, Loans Amortized Cost Basis by Origination Year 2021 |  |  | 0 |
YTD period recoveries, Loans Amortized Cost Basis by Origination Year 2020 |  |  | 0 |
YTD period recoveries, Loans Amortized Cost Basis by Origination Year 2019 |  |  | 0 |
YTD period recoveries, Loans Amortized Cost Basis by Origination Year 2018 |  |  | 0 |
YTD period recoveries, Loans Amortized Cost Basis by Origination Year 2017 |  |  | 0 |
YTD period recoveries, Loans Amortized Cost Basis by Origination Year Prior |  |  | 0 |
YTD period recoveries, Revolving Loans |  |  | 0 |
YTD period recoveries, Revolving Converted to Term Loans |  |  | 0 |
YTD period recoveries | 0 | 0 | 0 | 0
Net, Loans Amortized Cost Basis by Origination Year 2021 |  |  | 0 |
Net, Loans Amortized Cost Basis by Origination Year 2020 |  |  | 0 |
Net, Loans Amortized Cost Basis by Origination Year 2019 |  |  | 0 |
Net, Loans Amortized Cost Basis by Origination Year 2018 |  |  | 0 |
Net, Loans Amortized Cost Basis by Origination Year 2017 |  |  | 0 |
Net, Loans Amortized Cost Basis by Origination Year Prior |  |  | 0 |
Net, Revolving Loans |  |  | 0 |
Net, Revolving Converted to Term Loans |  |  | 0 |
Net | (0) | $ (0) | 0 | $ (0)
Installment and Other Loans [Member ] | Pass [Member] |  |  |  |
Total, Loans Amortized Cost Basis by Origination Year 2021 | 2,120 |  | 2,120 |
Total, Loans Amortized Cost Basis by Origination Year 2020 | 1,250 |  | 1,250 |
Total, Loans Amortized Cost Basis by Origination Year 2019 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2018 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2017 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year Prior | 0 |  | 0 |
Total, Revolving Loans | 0 |  | 0 |
Total, Revolving Converted to Term Loans | 0 |  | 0 |
Total loans | 3,370 |  | 3,370 |
Installment and Other Loans [Member ] | Special Mention [Member] |  |  |  |
Total, Loans Amortized Cost Basis by Origination Year 2021 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2020 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2019 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2018 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2017 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year Prior | 0 |  | 0 |
Total, Revolving Loans | 0 |  | 0 |
Total, Revolving Converted to Term Loans | 0 |  | 0 |
Total loans | 0 |  | 0 |
Installment and Other Loans [Member ] | Substandard [Member] |  |  |  |
Total, Loans Amortized Cost Basis by Origination Year 2021 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2020 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2019 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2018 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2017 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year Prior | 0 |  | 0 |
Total, Revolving Loans | 0 |  | 0 |
Total, Revolving Converted to Term Loans | 0 |  | 0 |
Total loans | 0 |  | 0 |
Installment and Other Loans [Member ] | Doubtful [Member] |  |  |  |
Total, Loans Amortized Cost Basis by Origination Year 2021 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2020 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2019 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2018 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2017 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year Prior | 0 |  | 0 |
Total, Revolving Loans | 0 |  | 0 |
Total, Revolving Converted to Term Loans | 0 |  | 0 |
Total loans | 0 |  | 0 |
Installment and Other Loans [Member ] | Unlikely to be Collected Financing Receivable [Member] |  |  |  |
Total, Loans Amortized Cost Basis by Origination Year 2021 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2020 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2019 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2018 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year 2017 | 0 |  | 0 |
Total, Loans Amortized Cost Basis by Origination Year Prior | 0 |  | 0 |
Total, Revolving Loans | 0 |  | 0 |
Total, Revolving Converted to Term Loans | 0 |  | 0 |
Total loans | $ 0 |  | $ 0 |

X
- Definition Amount, after recovery, of writeoff of financing receivable, charged against allowance for credit loss. + References No definition available. + Details
Name: | caty_FinancingReceivableAllowanceForCreditLossWriteoffAfterRecoveryNet
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of increase in allowance for credit loss on financing receivable originated more than five years prior to current fiscal year from recovery. + References No definition available. + Details
Name: | caty_FinancingReceivableOriginatedMoreThanFiveYearsBeforeCurrentFiscalYearAllowanceForCreditLossRecovery
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of writeoff of financing receivable originated more than five years prior to current fiscal year, charged against allowance for credit loss. + References No definition available. + Details
Name: | caty_FinancingReceivableOriginatedMoreThanFiveYearsBeforeCurrentFiscalYearAllowanceForCreditLossWriteOff
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount, after recovery, of writeoff of financing receivable originated more than five years prior to current fiscal year, charged against allowance for credit loss. + References No definition available. + Details
Name: | caty_FinancingReceivableOriginatedMoreThanFiveYearsBeforeCurrentFiscalYearAllowanceForCreditLossWriteOffAfterRecovery
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of increase in allowance for credit loss on financing receivable that can be withdrawn, repaid and redrawn from recovery. + References No definition available. + Details
Name: | caty_FinancingReceivableRevolvingAllowanceForCreditLossRecovery
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of writeoff of financing receivable that can be withdrawn, repaid and redrawn, charged against allowance for credit loss. + References No definition available. + Details
Name: | caty_FinancingReceivableRevolvingAllowanceForCreditLossWriteOff
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount, after recovery, of writeoff of financing receivable that can be withdrawn, repaid and redrawn, charged against allowance for credit loss. + References No definition available. + Details
Name: | caty_FinancingReceivableRevolvingAllowanceForCreditLossWriteOffAfterRecovery
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of increase in allowance for credit loss on financing receivable converted to term loan from recovery. + References No definition available. + Details
Name: | caty_FinancingReceivableRevolvingConvertedToTermLoanRecovery
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of writeoff of financing receivable converted to term loan, charged against allowance for credit loss. + References No definition available. + Details
Name: | caty_FinancingReceivableRevolvingConvertedToTermLoanWriteOff
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount, after recovery, of writeoff of financing receivable converted to term loan, charged against allowance for credit loss. + References No definition available. + Details
Name: | caty_FinancingReceivableRevolvingConvertedToTermLoanWriteoffAfterRecovery
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of increase in allowance for credit loss on financing receivable originated four years prior to current fiscal year from recovery. + References No definition available. + Details
Name: | caty_FinancingReceivableYearFiveOriginatedFourYearsBeforeCurrentFiscalYearAllowanceForCreditLossRecovery
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of writeoff of financing receivable originated four years prior to current fiscal year, charged against allowance for credit loss. + References No definition available. + Details
Name: | caty_FinancingReceivableYearFiveOriginatedFourYearsBeforeCurrentFiscalYearAllowanceForCreditLossWriteOff
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount, after recovery, of writeoff of financing receivable originated four years prior to current fiscal year, charged against allowance for credit loss. + References No definition available. + Details
Name: | caty_FinancingReceivableYearFiveOriginatedFourYearsBeforeCurrentFiscalYearAllowanceForCreditLossWriteOffAfterRecovery
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of increase in allowance for credit loss on financing receivable originated three years prior to current fiscal year from recovery. + References No definition available. + Details
Name: | caty_FinancingReceivableYearFourOriginatedThreeYearsBeforeCurrentFiscalYearAllowanceForCreditLossRecovery
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of writeoff of financing receivable originated three years prior to current fiscal year, charged against allowance for credit loss. + References No definition available. + Details
Name: | caty_FinancingReceivableYearFourOriginatedThreeYearsBeforeCurrentFiscalYearAllowanceForCreditLossWriteOff
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount, after recovery, of writeoff of financing receivable originated three years prior to current fiscal year, charged against allowance for credit loss. + References No definition available. + Details
Name: | caty_FinancingReceivableYearFourOriginatedThreeYearsBeforeCurrentFiscalYearAllowanceForCreditLossWriteOffAfterRecovery
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of increase in allowance for credit loss on financing receivable originated in current fiscal year from recovery. + References No definition available. + Details
Name: | caty_FinancingReceivableYearOneOriginatedCurrentFiscalYearAllowanceForCreditLossRecovery
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of writeoff of financing receivable originated in current fiscal year, charged against allowance for credit loss. + References No definition available. + Details
Name: | caty_FinancingReceivableYearOneOriginatedCurrentFiscalYearAllowanceForCreditLossWriteOff
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount, after recovery, of writeoff of financing receivable originated current fiscal year, charged against allowance for credit loss. + References No definition available. + Details
Name: | caty_FinancingReceivableYearOneOriginatedCurrentFiscalYearAllowanceForCreditLossWriteOffAfterRecovery
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of increase in allowance for credit loss on financing receivable originated two years prior to current fiscal year from recovery. + References No definition available. + Details
Name: | caty_FinancingReceivableYearThreeOriginatedTwoYearsBeforeCurrentFiscalYearAllowanceForCreditLossRecovery
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of writeoff of financing receivable originated two years prior to current fiscal year, charged against allowance for credit loss. + References No definition available. + Details
Name: | caty_FinancingReceivableYearThreeOriginatedTwoYearsBeforeCurrentFiscalYearAllowanceForCreditLossWriteOff
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount, after recovery, of writeoff of financing receivable originated two year prior to current fiscal year, charged against allowance for credit loss. + References No definition available. + Details
Name: | caty_FinancingReceivableYearThreeOriginatedTwoYearsBeforeCurrentFiscalYearAllowanceForCreditLossWriteOffAfterRecovery
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of increase in allowance for credit loss on financing receivable originated one year prior to current fiscal year from recovery. + References No definition available. + Details
Name: | caty_FinancingReceivableYearTwoOriginatedAllowanceForCreditLossRecovery
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of writeoff of financing receivable originated one year prior to current fiscal year, charged against allowance for credit loss. + References No definition available. + Details
Name: | caty_FinancingReceivableYearTwoOriginatedAllowanceForCreditLossWriteOff
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount, after recovery, of writeoff of financing receivable originated one year prior to current fiscal year, charged against allowance for credit loss. + References No definition available. + Details
Name: | caty_FinancingReceivableYearTwoOriginatedAllowanceForCreditLossWriteOffAfterRecovery
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of increase in allowance for credit loss on financing receivable from recovery. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of writeoff of financing receivable, charged against allowance for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of financing receivable originated more than five years prior to current fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919232-210447 + Details
Name: | us-gaap_FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of financing receivable originated four years prior to current fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919232-210447 + Details
Name: | us-gaap_FinancingReceivableOriginatedFourYearsBeforeLatestFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of financing receivable originated in current fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919232-210447 + Details
Name: | us-gaap_FinancingReceivableOriginatedInCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of financing receivable originated in fiscal year prior to current fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919232-210447 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448 + Details
Name: | us-gaap_FinancingReceivableOriginatedInFiscalYearBeforeLatestFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of financing receivable originated three years prior to current fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919232-210447 + Details
Name: | us-gaap_FinancingReceivableOriginatedThreeYearsBeforeLatestFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of financing receivable originated two years prior to current fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919232-210447 + Details
Name: | us-gaap_FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of financing receivable that can be withdrawn, repaid and redrawn. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919232-210447 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448 + Details
Name: | us-gaap_FinancingReceivableRevolving
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of revolving financing receivable converted to term loan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 6A -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL120270059-210447 + Details
Name: | us-gaap_FinancingReceivableRevolvingConvertedToTermLoan
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, before allowance for credit loss, of financing receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953401-111524 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919253-210447 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919230-210447 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 80 -URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922355-210448 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (1) Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (2) Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1404 -Paragraph (a) + Details
Name: | us-gaap_NotesReceivableGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_PassMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_SpecialMentionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_SubstandardMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_DoubtfulMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_UnlikelyToBeCollectedFinancingReceivableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=caty_RealEstateConstructionPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialRealEstatePortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=caty_EquityLinesPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=caty_InstallmentAndOtherLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |