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Loans and Allowances for Credit Losses, Credit Quality Indicators (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2019 | Dec. 31, 2018
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Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | $ 648,501 |  |  |
Financing Receivable, Originated, 2019 | 3,353,429 |  |  |
Financing Receivable, Originated, 2018 | 2,971,436 |  |  |
Financing Receivable, Originated, 2017 | 2,224,426 |  |  |
Financing Receivable, Originated, 2016 | 1,566,422 |  |  |
Financing Receivable, Originated, 2015 or Prior | 3,751,693 |  |  |
Financing Receivable, Revolving | 7,570,674 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 377,389 |  |  |
Total | 22,463,970 |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | $ 19,826,731 |  |
Non-Graded, Recorded Investment |  | 1,924,256 |  |
Total | 22,463,970 | 21,750,987 |  |
Related Allowance [Abstract] |  |  |  |
Internally Risk Graded, Allowance |  | 179,129 |  |
Non-Graded, Allowance |  | 14,435 |  |
Total | 315,311 | 210,759 | $ 205,340 | $ 207,457
Commercial [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 353,763 |  |  |
Financing Receivable, Originated, 2019 | 1,815,289 |  |  |
Financing Receivable, Originated, 2018 | 1,628,731 |  |  |
Financing Receivable, Originated, 2017 | 1,244,748 |  |  |
Financing Receivable, Originated, 2016 | 847,499 |  |  |
Financing Receivable, Originated, 2015 or Prior | 2,091,690 |  |  |
Financing Receivable, Revolving | 6,795,876 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 18,379 |  |  |
Total | 14,795,975 |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 13,997,538 |  |
Non-Graded, Recorded Investment |  | 34,112 |  |
Total | 14,795,975 | 14,031,650 |  |
Related Allowance [Abstract] |  |  |  |
Internally Risk Graded, Allowance |  | 117,236 |  |
Non-Graded, Allowance |  | 951 |  |
Total | 213,438 | 118,187 | 103,577 | 102,226
Commercial [Member] | Energy [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 2,285 |  |  |
Financing Receivable, Originated, 2019 | 111,236 |  |  |
Financing Receivable, Originated, 2018 | 85,206 |  |  |
Financing Receivable, Originated, 2017 | 15,377 |  |  |
Financing Receivable, Originated, 2016 | 1,564 |  |  |
Financing Receivable, Originated, 2015 or Prior | 45,822 |  |  |
Financing Receivable, Revolving | 3,850,186 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 0 |  |  |
Total | 4,111,676 |  |  |
Recorded Investment [Abstract] |  |  |  |
Total | 4,111,676 | 3,973,377 |  |
Commercial [Member] | Healthcare [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 131,031 |  |  |
Financing Receivable, Originated, 2019 | 619,122 |  |  |
Financing Receivable, Originated, 2018 | 631,928 |  |  |
Financing Receivable, Originated, 2017 | 484,768 |  |  |
Financing Receivable, Originated, 2016 | 250,555 |  |  |
Financing Receivable, Originated, 2015 or Prior | 838,232 |  |  |
Financing Receivable, Revolving | 209,433 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 27 |  |  |
Total | 3,165,096 |  |  |
Recorded Investment [Abstract] |  |  |  |
Total | 3,165,096 | 3,033,916 |  |
Commercial [Member] | Services [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 65,471 |  |  |
Financing Receivable, Originated, 2019 | 541,631 |  |  |
Financing Receivable, Originated, 2018 | 532,402 |  |  |
Financing Receivable, Originated, 2017 | 460,686 |  |  |
Financing Receivable, Originated, 2016 | 421,127 |  |  |
Financing Receivable, Originated, 2015 or Prior | 918,379 |  |  |
Financing Receivable, Revolving | 1,013,458 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 2,594 |  |  |
Total | 3,955,748 |  |  |
Recorded Investment [Abstract] |  |  |  |
Total | 3,955,748 | 3,122,163 |  |
Commercial [Member] | General business [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 154,976 |  |  |
Financing Receivable, Originated, 2019 | 543,300 |  |  |
Financing Receivable, Originated, 2018 | 379,195 |  |  |
Financing Receivable, Originated, 2017 | 283,917 |  |  |
Financing Receivable, Originated, 2016 | 174,253 |  |  |
Financing Receivable, Originated, 2015 or Prior | 289,257 |  |  |
Financing Receivable, Revolving | 1,722,799 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 15,758 |  |  |
Total | 3,563,455 |  |  |
Recorded Investment [Abstract] |  |  |  |
Total | 3,563,455 |  |  |
Commercial [Member] | Wholesale/retail [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Total |  | 1,760,866 |  |
Commercial [Member] | Manufacturing [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Total |  | 665,449 |  |
Commercial [Member] | Public finance [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Total |  | 709,868 |  |
Commercial [Member] | Other commercial and industrial [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Total |  | 766,011 |  |
Commercial real estate [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 187,958 |  |  |
Financing Receivable, Originated, 2019 | 1,085,183 |  |  |
Financing Receivable, Originated, 2018 | 1,050,268 |  |  |
Financing Receivable, Originated, 2017 | 618,601 |  |  |
Financing Receivable, Originated, 2016 | 391,320 |  |  |
Financing Receivable, Originated, 2015 or Prior | 885,160 |  |  |
Financing Receivable, Revolving | 231,553 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 42 |  |  |
Total | 4,450,085 |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 4,433,783 |  |
Non-Graded, Recorded Investment |  | 0 |  |
Total | 4,450,085 | 4,433,783 |  |
Related Allowance [Abstract] |  |  |  |
Internally Risk Graded, Allowance |  | 51,805 |  |
Non-Graded, Allowance |  | 0 |  |
Total | 51,461 | 51,805 | 58,134 | 60,026
Commercial real estate [Member] | Residential construction and land development [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Total |  | 150,879 |  |
Commercial real estate [Member] | Retail [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Total |  | 775,521 |  |
Commercial real estate [Member] | Office [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Total |  | 928,379 |  |
Commercial real estate [Member] | Multifamily [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Total |  | 1,265,562 |  |
Commercial real estate [Member] | Industrial [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Total |  | 856,117 |  |
Commercial real estate [Member] | Other commercial real estate [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Total |  | 457,325 |  |
Loans to individuals [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 106,780 |  |  |
Financing Receivable, Originated, 2019 | 452,957 |  |  |
Financing Receivable, Originated, 2018 | 292,437 |  |  |
Financing Receivable, Originated, 2017 | 361,077 |  |  |
Financing Receivable, Originated, 2016 | 327,603 |  |  |
Financing Receivable, Originated, 2015 or Prior | 774,843 |  |  |
Financing Receivable, Revolving | 543,245 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 358,968 |  |  |
Total | 3,217,910 |  |  |
Recorded Investment [Abstract] |  |  |  |
Total | 3,217,910 | 2,084,172 |  |
Related Allowance [Abstract] |  |  |  |
Total | 50,412 |  |  |
Loans to individuals [Member] | Permanent Residential Mortgage [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Total |  | 1,057,321 |  |
Loans to individuals [Member] | Permanent Residential Mortgage [Member] | US Government Agency Insured Loans [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Total |  | 197,794 |  |
Loans to individuals [Member] | Home Equity Loan [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Total |  | 829,057 |  |
Loans to individuals [Member] | Residential mortgage [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 58,635 |  |  |
Financing Receivable, Originated, 2019 | 216,265 |  |  |
Financing Receivable, Originated, 2018 | 196,001 |  |  |
Financing Receivable, Originated, 2017 | 232,074 |  |  |
Financing Receivable, Originated, 2016 | 223,519 |  |  |
Financing Receivable, Originated, 2015 or Prior | 524,851 |  |  |
Financing Receivable, Revolving | 37,242 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 355,968 |  |  |
Total | 1,844,555 |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 279,113 |  |
Non-Graded, Recorded Investment |  | 1,805,059 |  |
Total | 1,844,555 | 2,084,172 |  |
Related Allowance [Abstract] |  |  |  |
Internally Risk Graded, Allowance |  | 3,085 |  |
Non-Graded, Allowance |  | 11,315 |  |
Total |  | 14,400 | 15,668 | 17,964
Loans to individuals [Member] | Residential mortgage [Member] | US Government Agency Insured Loans [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 0 |  |  |
Financing Receivable, Originated, 2019 | 1,459 |  |  |
Financing Receivable, Originated, 2018 | 8,321 |  |  |
Financing Receivable, Originated, 2017 | 13,353 |  |  |
Financing Receivable, Originated, 2016 | 28,986 |  |  |
Financing Receivable, Originated, 2015 or Prior | 145,770 |  |  |
Financing Receivable, Revolving | 0 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 0 |  |  |
Total | 197,889 |  |  |
Recorded Investment [Abstract] |  |  |  |
Total | 197,889 |  |  |
Loans to individuals [Member] | Personal [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 48,145 |  |  |
Financing Receivable, Originated, 2019 | 235,233 |  |  |
Financing Receivable, Originated, 2018 | 88,115 |  |  |
Financing Receivable, Originated, 2017 | 115,650 |  |  |
Financing Receivable, Originated, 2016 | 75,098 |  |  |
Financing Receivable, Originated, 2015 or Prior | 104,222 |  |  |
Financing Receivable, Revolving | 506,003 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 3,000 |  |  |
Total | 1,175,466 |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 1,116,297 |  |
Non-Graded, Recorded Investment |  | 85,085 |  |
Total | 1,175,466 | 1,201,382 |  |
Related Allowance [Abstract] |  |  |  |
Internally Risk Graded, Allowance |  | 7,003 |  |
Non-Graded, Allowance |  | 2,169 |  |
Total |  | 9,172 | 8,783 | 9,473
Specific Allowance [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 19,826,731 |  |
Non-Graded, Recorded Investment |  | 1,924,256 |  |
Total |  | 21,750,987 |  |
Related Allowance [Abstract] |  |  |  |
Internally Risk Graded, Allowance |  | 179,129 |  |
Non-Graded, Allowance |  | 14,435 |  |
Total |  | 193,564 |  |
Nonspecific Allowance [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 0 |  |
Non-Graded, Recorded Investment |  | 0 |  |
Total |  | 0 |  |
Related Allowance [Abstract] |  |  |  |
Internally Risk Graded, Allowance |  | 0 |  |
Non-Graded, Allowance |  | 0 |  |
Total |  | 17,195 | $ 19,178 | $ 17,768
Performing [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Non-Graded, Recorded Investment |  | 1,886,858 |  |
Performing [Member] | Pass [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 19,312,702 |  |
Performing [Member] | Special Mention [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 210,149 |  |
Performing [Member] | Accruing Substandard [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 160,326 |  |
Performing [Member] | Commercial [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Non-Graded, Recorded Investment |  | 34,075 |  |
Performing [Member] | Commercial [Member] | Pass [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 13,538,705 |  |
Performing [Member] | Commercial [Member] | Special Mention [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 187,881 |  |
Performing [Member] | Commercial [Member] | Accruing Substandard [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 155,573 |  |
Performing [Member] | Commercial [Member] | Energy [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Non-Graded, Recorded Investment |  | 0 |  |
Performing [Member] | Commercial [Member] | Energy [Member] | Pass [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 2,285 |  |  |
Financing Receivable, Originated, 2019 | 107,434 |  |  |
Financing Receivable, Originated, 2018 | 74,946 |  |  |
Financing Receivable, Originated, 2017 | 15,377 |  |  |
Financing Receivable, Originated, 2016 | 1,506 |  |  |
Financing Receivable, Originated, 2015 or Prior | 3,484 |  |  |
Financing Receivable, Revolving | 3,505,123 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 0 |  |  |
Total | 3,710,155 |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 3,700,406 |  |
Performing [Member] | Commercial [Member] | Energy [Member] | Special Mention [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 0 |  |  |
Financing Receivable, Originated, 2019 | 0 |  |  |
Financing Receivable, Originated, 2018 | 10,260 |  |  |
Financing Receivable, Originated, 2017 | 0 |  |  |
Financing Receivable, Originated, 2016 | 0 |  |  |
Financing Receivable, Originated, 2015 or Prior | 0 |  |  |
Financing Receivable, Revolving | 118,222 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 0 |  |  |
Total | 128,482 |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 117,298 |  |
Performing [Member] | Commercial [Member] | Energy [Member] | Accruing Substandard [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 0 |  |  |
Financing Receivable, Originated, 2019 | 0 |  |  |
Financing Receivable, Originated, 2018 | 0 |  |  |
Financing Receivable, Originated, 2017 | 0 |  |  |
Financing Receivable, Originated, 2016 | 58 |  |  |
Financing Receivable, Originated, 2015 or Prior | 13,439 |  |  |
Financing Receivable, Revolving | 163,094 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 0 |  |  |
Total | 176,591 |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 63,951 |  |
Performing [Member] | Commercial [Member] | Healthcare [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Non-Graded, Recorded Investment |  | 0 |  |
Performing [Member] | Commercial [Member] | Healthcare [Member] | Pass [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 131,002 |  |  |
Financing Receivable, Originated, 2019 | 615,580 |  |  |
Financing Receivable, Originated, 2018 | 623,438 |  |  |
Financing Receivable, Originated, 2017 | 479,985 |  |  |
Financing Receivable, Originated, 2016 | 250,320 |  |  |
Financing Receivable, Originated, 2015 or Prior | 806,699 |  |  |
Financing Receivable, Revolving | 205,384 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 27 |  |  |
Total | 3,112,435 |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 2,995,514 |  |
Performing [Member] | Commercial [Member] | Healthcare [Member] | Special Mention [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 0 |  |  |
Financing Receivable, Originated, 2019 | 0 |  |  |
Financing Receivable, Originated, 2018 | 0 |  |  |
Financing Receivable, Originated, 2017 | 3,782 |  |  |
Financing Receivable, Originated, 2016 | 178 |  |  |
Financing Receivable, Originated, 2015 or Prior | 19,133 |  |  |
Financing Receivable, Revolving | 3,515 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 0 |  |  |
Total | 26,608 |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 13,117 |  |
Performing [Member] | Commercial [Member] | Healthcare [Member] | Accruing Substandard [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 0 |  |  |
Financing Receivable, Originated, 2019 | 3,505 |  |  |
Financing Receivable, Originated, 2018 | 7,955 |  |  |
Financing Receivable, Originated, 2017 | 1,001 |  |  |
Financing Receivable, Originated, 2016 | 57 |  |  |
Financing Receivable, Originated, 2015 or Prior | 9,465 |  |  |
Financing Receivable, Revolving | 0 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 0 |  |  |
Total | 21,983 |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 20,805 |  |
Performing [Member] | Commercial [Member] | Services [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Non-Graded, Recorded Investment |  | 0 |  |
Performing [Member] | Commercial [Member] | Services [Member] | Pass [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 65,471 |  |  |
Financing Receivable, Originated, 2019 | 529,831 |  |  |
Financing Receivable, Originated, 2018 | 512,549 |  |  |
Financing Receivable, Originated, 2017 | 441,302 |  |  |
Financing Receivable, Originated, 2016 | 407,067 |  |  |
Financing Receivable, Originated, 2015 or Prior | 899,776 |  |  |
Financing Receivable, Revolving | 987,628 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 2,594 |  |  |
Total | 3,846,218 |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 3,050,946 |  |
Performing [Member] | Commercial [Member] | Services [Member] | Special Mention [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 0 |  |  |
Financing Receivable, Originated, 2019 | 1,125 |  |  |
Financing Receivable, Originated, 2018 | 18,071 |  |  |
Financing Receivable, Originated, 2017 | 13,977 |  |  |
Financing Receivable, Originated, 2016 | 4,219 |  |  |
Financing Receivable, Originated, 2015 or Prior | 10,963 |  |  |
Financing Receivable, Revolving | 10,715 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 0 |  |  |
Total | 59,070 |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 29,943 |  |
Performing [Member] | Commercial [Member] | Services [Member] | Accruing Substandard [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 0 |  |  |
Financing Receivable, Originated, 2019 | 10,675 |  |  |
Financing Receivable, Originated, 2018 | 1,782 |  |  |
Financing Receivable, Originated, 2017 | 2,774 |  |  |
Financing Receivable, Originated, 2016 | 8,674 |  |  |
Financing Receivable, Originated, 2015 or Prior | 3,709 |  |  |
Financing Receivable, Revolving | 14,421 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 0 |  |  |
Total | 42,035 |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 33,791 |  |
Performing [Member] | Commercial [Member] | General business [Member] | Pass [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 154,807 |  |  |
Financing Receivable, Originated, 2019 | 525,223 |  |  |
Financing Receivable, Originated, 2018 | 365,108 |  |  |
Financing Receivable, Originated, 2017 | 271,723 |  |  |
Financing Receivable, Originated, 2016 | 165,711 |  |  |
Financing Receivable, Originated, 2015 or Prior | 278,923 |  |  |
Financing Receivable, Revolving | 1,705,114 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 15,600 |  |  |
Total | 3,482,209 |  |  |
Performing [Member] | Commercial [Member] | General business [Member] | Special Mention [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 0 |  |  |
Financing Receivable, Originated, 2019 | 7,382 |  |  |
Financing Receivable, Originated, 2018 | 3,259 |  |  |
Financing Receivable, Originated, 2017 | 6,530 |  |  |
Financing Receivable, Originated, 2016 | 1,003 |  |  |
Financing Receivable, Originated, 2015 or Prior | 5,168 |  |  |
Financing Receivable, Revolving | 7,387 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 138 |  |  |
Total | 30,867 |  |  |
Performing [Member] | Commercial [Member] | General business [Member] | Accruing Substandard [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 169 |  |  |
Financing Receivable, Originated, 2019 | 8,715 |  |  |
Financing Receivable, Originated, 2018 | 5,900 |  |  |
Financing Receivable, Originated, 2017 | 4,564 |  |  |
Financing Receivable, Originated, 2016 | 6,195 |  |  |
Financing Receivable, Originated, 2015 or Prior | 5,005 |  |  |
Financing Receivable, Revolving | 10,144 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 6 |  |  |
Total | 40,698 |  |  |
Performing [Member] | Commercial [Member] | Wholesale/retail [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Non-Graded, Recorded Investment |  | 0 |  |
Performing [Member] | Commercial [Member] | Wholesale/retail [Member] | Pass [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 1,749,023 |  |
Performing [Member] | Commercial [Member] | Wholesale/retail [Member] | Special Mention [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 5,281 |  |
Performing [Member] | Commercial [Member] | Wholesale/retail [Member] | Accruing Substandard [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 5,399 |  |
Performing [Member] | Commercial [Member] | Manufacturing [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Non-Graded, Recorded Investment |  | 0 |  |
Performing [Member] | Commercial [Member] | Manufacturing [Member] | Pass [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 623,219 |  |
Performing [Member] | Commercial [Member] | Manufacturing [Member] | Special Mention [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 18,214 |  |
Performing [Member] | Commercial [Member] | Manufacturing [Member] | Accruing Substandard [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 13,883 |  |
Performing [Member] | Commercial [Member] | Public finance [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Non-Graded, Recorded Investment |  | 0 |  |
Performing [Member] | Commercial [Member] | Public finance [Member] | Pass [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 709,868 |  |
Performing [Member] | Commercial [Member] | Public finance [Member] | Special Mention [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 0 |  |
Performing [Member] | Commercial [Member] | Public finance [Member] | Accruing Substandard [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 0 |  |
Performing [Member] | Commercial [Member] | Other commercial and industrial [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Non-Graded, Recorded Investment |  | 34,075 |  |
Performing [Member] | Commercial [Member] | Other commercial and industrial [Member] | Pass [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 709,729 |  |
Performing [Member] | Commercial [Member] | Other commercial and industrial [Member] | Special Mention [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 4,028 |  |
Performing [Member] | Commercial [Member] | Other commercial and industrial [Member] | Accruing Substandard [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 17,744 |  |
Performing [Member] | Commercial real estate [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Non-Graded, Recorded Investment |  | 0 |  |
Performing [Member] | Commercial real estate [Member] | Pass [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 187,958 |  |  |
Financing Receivable, Originated, 2019 | 1,085,148 |  |  |
Financing Receivable, Originated, 2018 | 1,049,257 |  |  |
Financing Receivable, Originated, 2017 | 599,480 |  |  |
Financing Receivable, Originated, 2016 | 382,196 |  |  |
Financing Receivable, Originated, 2015 or Prior | 880,706 |  |  |
Financing Receivable, Revolving | 231,526 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 42 |  |  |
Total | 4,416,313 |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 4,381,663 |  |
Performing [Member] | Commercial real estate [Member] | Special Mention [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 0 |  |  |
Financing Receivable, Originated, 2019 | 0 |  |  |
Financing Receivable, Originated, 2018 | 0 |  |  |
Financing Receivable, Originated, 2017 | 12,167 |  |  |
Financing Receivable, Originated, 2016 | 1,640 |  |  |
Financing Receivable, Originated, 2015 or Prior | 3,152 |  |  |
Financing Receivable, Revolving | 0 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 0 |  |  |
Total | 16,959 |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 22,145 |  |
Performing [Member] | Commercial real estate [Member] | Accruing Substandard [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 0 |  |  |
Financing Receivable, Originated, 2019 | 35 |  |  |
Financing Receivable, Originated, 2018 | 1,011 |  |  |
Financing Receivable, Originated, 2017 | 6,722 |  |  |
Financing Receivable, Originated, 2016 | 0 |  |  |
Financing Receivable, Originated, 2015 or Prior | 473 |  |  |
Financing Receivable, Revolving | 27 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 0 |  |  |
Total | 8,268 |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 2,349 |  |
Performing [Member] | Commercial real estate [Member] | Residential construction and land development [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Non-Graded, Recorded Investment |  | 0 |  |
Performing [Member] | Commercial real estate [Member] | Residential construction and land development [Member] | Pass [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 150,529 |  |
Performing [Member] | Commercial real estate [Member] | Residential construction and land development [Member] | Special Mention [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 0 |  |
Performing [Member] | Commercial real estate [Member] | Residential construction and land development [Member] | Accruing Substandard [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 0 |  |
Performing [Member] | Commercial real estate [Member] | Retail [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Non-Graded, Recorded Investment |  | 0 |  |
Performing [Member] | Commercial real estate [Member] | Retail [Member] | Pass [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 743,343 |  |
Performing [Member] | Commercial real estate [Member] | Retail [Member] | Special Mention [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 12,067 |  |
Performing [Member] | Commercial real estate [Member] | Retail [Member] | Accruing Substandard [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 1,243 |  |
Performing [Member] | Commercial real estate [Member] | Office [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Non-Graded, Recorded Investment |  | 0 |  |
Performing [Member] | Commercial real estate [Member] | Office [Member] | Pass [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 923,202 |  |
Performing [Member] | Commercial real estate [Member] | Office [Member] | Special Mention [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 5,177 |  |
Performing [Member] | Commercial real estate [Member] | Office [Member] | Accruing Substandard [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 0 |  |
Performing [Member] | Commercial real estate [Member] | Multifamily [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Non-Graded, Recorded Investment |  | 0 |  |
Performing [Member] | Commercial real estate [Member] | Multifamily [Member] | Pass [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 1,257,005 |  |
Performing [Member] | Commercial real estate [Member] | Multifamily [Member] | Special Mention [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 1,604 |  |
Performing [Member] | Commercial real estate [Member] | Multifamily [Member] | Accruing Substandard [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 95 |  |
Performing [Member] | Commercial real estate [Member] | Industrial [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Non-Graded, Recorded Investment |  | 0 |  |
Performing [Member] | Commercial real estate [Member] | Industrial [Member] | Pass [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 852,539 |  |
Performing [Member] | Commercial real estate [Member] | Industrial [Member] | Special Mention [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 1,658 |  |
Performing [Member] | Commercial real estate [Member] | Industrial [Member] | Accruing Substandard [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 1,011 |  |
Performing [Member] | Commercial real estate [Member] | Other commercial real estate [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Non-Graded, Recorded Investment |  | 0 |  |
Performing [Member] | Commercial real estate [Member] | Other commercial real estate [Member] | Pass [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 455,045 |  |
Performing [Member] | Commercial real estate [Member] | Other commercial real estate [Member] | Special Mention [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 1,639 |  |
Performing [Member] | Commercial real estate [Member] | Other commercial real estate [Member] | Accruing Substandard [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 0 |  |
Performing [Member] | Loans to individuals [Member] | Permanent Residential Mortgage [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Non-Graded, Recorded Investment |  | 758,260 |  |
Performing [Member] | Loans to individuals [Member] | Permanent Residential Mortgage [Member] | Pass [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 276,138 |  |
Performing [Member] | Loans to individuals [Member] | Permanent Residential Mortgage [Member] | Special Mention [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 78 |  |
Performing [Member] | Loans to individuals [Member] | Permanent Residential Mortgage [Member] | Accruing Substandard [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 2,404 |  |
Performing [Member] | Loans to individuals [Member] | Permanent Residential Mortgage [Member] | US Government Agency Insured Loans [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Non-Graded, Recorded Investment |  | 191,694 |  |
Performing [Member] | Loans to individuals [Member] | Permanent Residential Mortgage [Member] | US Government Agency Insured Loans [Member] | Pass [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 0 |  |
Performing [Member] | Loans to individuals [Member] | Permanent Residential Mortgage [Member] | US Government Agency Insured Loans [Member] | Special Mention [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 0 |  |
Performing [Member] | Loans to individuals [Member] | Permanent Residential Mortgage [Member] | US Government Agency Insured Loans [Member] | Accruing Substandard [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 0 |  |
Performing [Member] | Loans to individuals [Member] | Home Equity Loan [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Non-Graded, Recorded Investment |  | 817,976 |  |
Performing [Member] | Loans to individuals [Member] | Home Equity Loan [Member] | Pass [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 0 |  |
Performing [Member] | Loans to individuals [Member] | Home Equity Loan [Member] | Special Mention [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 0 |  |
Performing [Member] | Loans to individuals [Member] | Home Equity Loan [Member] | Accruing Substandard [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 0 |  |
Performing [Member] | Loans to individuals [Member] | Residential mortgage [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Non-Graded, Recorded Investment |  | 1,767,930 |  |
Performing [Member] | Loans to individuals [Member] | Residential mortgage [Member] | Pass [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 58,635 |  |  |
Financing Receivable, Originated, 2019 | 216,234 |  |  |
Financing Receivable, Originated, 2018 | 195,224 |  |  |
Financing Receivable, Originated, 2017 | 231,620 |  |  |
Financing Receivable, Originated, 2016 | 220,120 |  |  |
Financing Receivable, Originated, 2015 or Prior | 496,676 |  |  |
Financing Receivable, Revolving | 36,298 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 352,870 |  |  |
Total | 1,807,677 |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 276,138 |  |
Performing [Member] | Loans to individuals [Member] | Residential mortgage [Member] | Special Mention [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 0 |  |  |
Financing Receivable, Originated, 2019 | 0 |  |  |
Financing Receivable, Originated, 2018 | 286 |  |  |
Financing Receivable, Originated, 2017 | 38 |  |  |
Financing Receivable, Originated, 2016 | 205 |  |  |
Financing Receivable, Originated, 2015 or Prior | 1,859 |  |  |
Financing Receivable, Revolving | 246 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 835 |  |  |
Total | 3,469 |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 78 |  |
Performing [Member] | Loans to individuals [Member] | Residential mortgage [Member] | Accruing Substandard [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 0 |  |  |
Financing Receivable, Originated, 2019 | 0 |  |  |
Financing Receivable, Originated, 2018 | 0 |  |  |
Financing Receivable, Originated, 2017 | 94 |  |  |
Financing Receivable, Originated, 2016 | 2,155 |  |  |
Financing Receivable, Originated, 2015 or Prior | 277 |  |  |
Financing Receivable, Revolving | 40 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 122 |  |  |
Total | 2,688 |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 2,404 |  |
Performing [Member] | Loans to individuals [Member] | Residential mortgage [Member] | US Government Agency Insured Loans [Member] | Pass [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 0 |  |  |
Financing Receivable, Originated, 2019 | 1,459 |  |  |
Financing Receivable, Originated, 2018 | 8,321 |  |  |
Financing Receivable, Originated, 2017 | 13,353 |  |  |
Financing Receivable, Originated, 2016 | 28,986 |  |  |
Financing Receivable, Originated, 2015 or Prior | 140,765 |  |  |
Financing Receivable, Revolving | 0 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 0 |  |  |
Total | 192,884 |  |  |
Performing [Member] | Loans to individuals [Member] | Personal [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Non-Graded, Recorded Investment |  | 84,853 |  |
Performing [Member] | Loans to individuals [Member] | Personal [Member] | Pass [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 48,145 |  |  |
Financing Receivable, Originated, 2019 | 234,882 |  |  |
Financing Receivable, Originated, 2018 | 88,016 |  |  |
Financing Receivable, Originated, 2017 | 115,576 |  |  |
Financing Receivable, Originated, 2016 | 74,987 |  |  |
Financing Receivable, Originated, 2015 or Prior | 103,717 |  |  |
Financing Receivable, Revolving | 505,951 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 3,000 |  |  |
Total | 1,174,274 |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 1,116,196 |  |
Performing [Member] | Loans to individuals [Member] | Personal [Member] | Special Mention [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 0 |  |  |
Financing Receivable, Originated, 2019 | 30 |  |  |
Financing Receivable, Originated, 2018 | 37 |  |  |
Financing Receivable, Originated, 2017 | 50 |  |  |
Financing Receivable, Originated, 2016 | 49 |  |  |
Financing Receivable, Originated, 2015 or Prior | 455 |  |  |
Financing Receivable, Revolving | 2 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 0 |  |  |
Total | 623 |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 45 |  |
Performing [Member] | Loans to individuals [Member] | Personal [Member] | Accruing Substandard [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 0 |  |  |
Financing Receivable, Originated, 2019 | 264 |  |  |
Financing Receivable, Originated, 2018 | 9 |  |  |
Financing Receivable, Originated, 2017 | 0 |  |  |
Financing Receivable, Originated, 2016 | 0 |  |  |
Financing Receivable, Originated, 2015 or Prior | 0 |  |  |
Financing Receivable, Revolving | 19 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 0 |  |  |
Total | 292 |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 0 |  |
Nonperforming Financial Instruments [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 143,554 |  |
Non-Graded, Recorded Investment |  | 37,398 |  |
Nonperforming Financial Instruments [Member] | Commercial [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 115,379 |  |
Non-Graded, Recorded Investment |  | 37 |  |
Nonperforming Financial Instruments [Member] | Commercial [Member] | Energy [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 91,722 |  |
Non-Graded, Recorded Investment |  | 0 |  |
Nonperforming Financial Instruments [Member] | Commercial [Member] | Energy [Member] | Nonaccruing substandard and doubtful [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 0 |  |  |
Financing Receivable, Originated, 2019 | 3,802 |  |  |
Financing Receivable, Originated, 2018 | 0 |  |  |
Financing Receivable, Originated, 2017 | 0 |  |  |
Financing Receivable, Originated, 2016 | 0 |  |  |
Financing Receivable, Originated, 2015 or Prior | 28,899 |  |  |
Financing Receivable, Revolving | 63,747 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 0 |  |  |
Total | 96,448 |  |  |
Nonperforming Financial Instruments [Member] | Commercial [Member] | Healthcare [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 4,480 |  |
Non-Graded, Recorded Investment |  | 0 |  |
Nonperforming Financial Instruments [Member] | Commercial [Member] | Healthcare [Member] | Nonaccruing substandard and doubtful [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 29 |  |  |
Financing Receivable, Originated, 2019 | 37 |  |  |
Financing Receivable, Originated, 2018 | 535 |  |  |
Financing Receivable, Originated, 2017 | 0 |  |  |
Financing Receivable, Originated, 2016 | 0 |  |  |
Financing Receivable, Originated, 2015 or Prior | 2,935 |  |  |
Financing Receivable, Revolving | 534 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 0 |  |  |
Total | 4,070 |  |  |
Nonperforming Financial Instruments [Member] | Commercial [Member] | Services [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 7,483 |  |
Non-Graded, Recorded Investment |  | 0 |  |
Nonperforming Financial Instruments [Member] | Commercial [Member] | Services [Member] | Nonaccruing substandard and doubtful [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 0 |  |  |
Financing Receivable, Originated, 2019 | 0 |  |  |
Financing Receivable, Originated, 2018 | 0 |  |  |
Financing Receivable, Originated, 2017 | 2,633 |  |  |
Financing Receivable, Originated, 2016 | 1,167 |  |  |
Financing Receivable, Originated, 2015 or Prior | 3,931 |  |  |
Financing Receivable, Revolving | 694 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 0 |  |  |
Total | 8,425 |  |  |
Nonperforming Financial Instruments [Member] | Commercial [Member] | General business [Member] | Nonaccruing substandard and doubtful [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 0 |  |  |
Financing Receivable, Originated, 2019 | 1,980 |  |  |
Financing Receivable, Originated, 2018 | 4,928 |  |  |
Financing Receivable, Originated, 2017 | 1,100 |  |  |
Financing Receivable, Originated, 2016 | 1,344 |  |  |
Financing Receivable, Originated, 2015 or Prior | 161 |  |  |
Financing Receivable, Revolving | 154 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 14 |  |  |
Total | 9,681 |  |  |
Nonperforming Financial Instruments [Member] | Commercial [Member] | Wholesale/retail [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 1,163 |  |
Non-Graded, Recorded Investment |  | 0 |  |
Nonperforming Financial Instruments [Member] | Commercial [Member] | Manufacturing [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 10,133 |  |
Non-Graded, Recorded Investment |  | 0 |  |
Nonperforming Financial Instruments [Member] | Commercial [Member] | Public finance [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 0 |  |
Non-Graded, Recorded Investment |  | 0 |  |
Nonperforming Financial Instruments [Member] | Commercial [Member] | Other commercial and industrial [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 398 |  |
Non-Graded, Recorded Investment |  | 37 |  |
Nonperforming Financial Instruments [Member] | Commercial real estate [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 27,626 |  |
Non-Graded, Recorded Investment |  | 0 |  |
Nonperforming Financial Instruments [Member] | Commercial real estate [Member] | Nonaccruing substandard and doubtful [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 0 |  |  |
Financing Receivable, Originated, 2019 | 0 |  |  |
Financing Receivable, Originated, 2018 | 0 |  |  |
Financing Receivable, Originated, 2017 | 232 |  |  |
Financing Receivable, Originated, 2016 | 7,484 |  |  |
Financing Receivable, Originated, 2015 or Prior | 829 |  |  |
Financing Receivable, Revolving | 0 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 0 |  |  |
Total | 8,545 |  |  |
Nonperforming Financial Instruments [Member] | Commercial real estate [Member] | Residential construction and land development [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 350 |  |
Non-Graded, Recorded Investment |  | 0 |  |
Nonperforming Financial Instruments [Member] | Commercial real estate [Member] | Retail [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 18,868 |  |
Non-Graded, Recorded Investment |  | 0 |  |
Nonperforming Financial Instruments [Member] | Commercial real estate [Member] | Office [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 0 |  |
Non-Graded, Recorded Investment |  | 0 |  |
Nonperforming Financial Instruments [Member] | Commercial real estate [Member] | Multifamily [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
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Non-Graded, Recorded Investment |  | 0 |  |
Nonperforming Financial Instruments [Member] | Commercial real estate [Member] | Industrial [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 909 |  |
Non-Graded, Recorded Investment |  | 0 |  |
Nonperforming Financial Instruments [Member] | Commercial real estate [Member] | Other commercial real estate [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 641 |  |
Non-Graded, Recorded Investment |  | 0 |  |
Nonperforming Financial Instruments [Member] | Loans to individuals [Member] | Permanent Residential Mortgage [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 493 |  |
Non-Graded, Recorded Investment |  | 19,948 |  |
Nonperforming Financial Instruments [Member] | Loans to individuals [Member] | Permanent Residential Mortgage [Member] | US Government Agency Insured Loans [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 0 |  |
Non-Graded, Recorded Investment |  | 6,100 |  |
Nonperforming Financial Instruments [Member] | Loans to individuals [Member] | Home Equity Loan [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 0 |  |
Non-Graded, Recorded Investment |  | 11,081 |  |
Nonperforming Financial Instruments [Member] | Loans to individuals [Member] | Residential mortgage [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 493 |  |
Non-Graded, Recorded Investment |  | 37,129 |  |
Nonperforming Financial Instruments [Member] | Loans to individuals [Member] | Residential mortgage [Member] | Nonaccruing substandard and doubtful [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 0 |  |  |
Financing Receivable, Originated, 2019 | 31 |  |  |
Financing Receivable, Originated, 2018 | 491 |  |  |
Financing Receivable, Originated, 2017 | 322 |  |  |
Financing Receivable, Originated, 2016 | 1,039 |  |  |
Financing Receivable, Originated, 2015 or Prior | 26,039 |  |  |
Financing Receivable, Revolving | 658 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 2,141 |  |  |
Total | 30,721 |  |  |
Nonperforming Financial Instruments [Member] | Loans to individuals [Member] | Residential mortgage [Member] | US Government Agency Insured Loans [Member] | Nonaccruing substandard and doubtful [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
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Financing Receivable, Originated, 2019 | 0 |  |  |
Financing Receivable, Originated, 2018 | 0 |  |  |
Financing Receivable, Originated, 2017 | 0 |  |  |
Financing Receivable, Originated, 2016 | 0 |  |  |
Financing Receivable, Originated, 2015 or Prior | 5,005 |  |  |
Financing Receivable, Revolving | 0 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 0 |  |  |
Total | 5,005 |  |  |
Nonperforming Financial Instruments [Member] | Loans to individuals [Member] | Personal [Member] |  |  |  |
Recorded Investment [Abstract] |  |  |  |
Internally Risk Graded, Recorded Investment |  | 56 |  |
Non-Graded, Recorded Investment |  | $ 232 |  |
Nonperforming Financial Instruments [Member] | Loans to individuals [Member] | Personal [Member] | Nonaccruing substandard and doubtful [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator Line Items [Abstract] |  |  |  |
Financing Receivable, Originated, 2020 | 0 |  |  |
Financing Receivable, Originated, 2019 | 57 |  |  |
Financing Receivable, Originated, 2018 | 53 |  |  |
Financing Receivable, Originated, 2017 | 24 |  |  |
Financing Receivable, Originated, 2016 | 62 |  |  |
Financing Receivable, Originated, 2015 or Prior | 50 |  |  |
Financing Receivable, Revolving | 31 |  |  |
Financing Receivable, Revolving, Converted to Term Loan | 0 |  |  |
Total | $ 277 |  |  |

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