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Note 8 - Loans - Loan Held for Investment by Loan Portfolio Segments, Internal Risk Ratings and Vintage Year (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Dec. 31, 2024
Loans originated in current year | $ 605,148 |  | $ 2,545,564
Loans originated year prior | 2,459,424 |  | 3,349,730
Loans originated three years prior | 3,285,017 |  | 3,168,851
Loans originated four years prior | 3,052,263 |  | 2,593,759
Loans originated five years prior | 2,515,499 |  | 1,364,973
Total, Loans Amortized Cost Basis by Origination Year Prior | 5,142,546 |  | 4,069,831
Total, Revolving Loans | 2,252,671 |  | 2,248,231
Total, Revolving Converted to Term Loans | 28,778 |  | 24,475
Total loans | 19,341,346 |  | 19,365,414
Loans originated in current year, write offs | 0 |  | 188
Loans originated year prior, write offs | 20 |  | 1,586
Loans originated three years prior, write offs | 42 |  | 3,166
Loans originated four years prior, write offs | 163 |  | 9,009
Loans originated five years prior, write offs | 2,119 |  | 553
Total, Loans Amortized Cost Basis by Origination Year Prior, Write Offs | 0 |  | 4,237
Total, Revolving Loans Write Offs | 0 |  | 12,733
Total, Revolving Converted to Term Loans, Write Offs | 0 |  | 0
YTD gross write-offs | 2,344 | $ 2,193 | 31,472
Total loans | 19,341,346 |  | 19,365,414
Commercial Portfolio Segment [Member] |  |  |
Loans originated in current year | 63,767 |  | 402,743
Loans originated year prior | 330,063 |  | 259,797
Loans originated three years prior | 247,964 |  | 216,034
Loans originated four years prior | 179,510 |  | 211,728
Loans originated five years prior | 193,124 |  | 58,833
Total, Loans Amortized Cost Basis by Origination Year Prior | 151,807 |  | 102,119
Total, Revolving Loans | 1,825,018 |  | 1,835,445
Total, Revolving Converted to Term Loans | 8,268 |  | 8,026
Total loans | 2,999,521 |  | 3,094,725
Loans originated in current year, write offs | 0 |  | 188
Loans originated year prior, write offs | 20 |  | 1,586
Loans originated three years prior, write offs | 42 |  | 3,151
Loans originated four years prior, write offs | 163 |  | 8,950
Loans originated five years prior, write offs | 2,119 |  | 257
Total, Loans Amortized Cost Basis by Origination Year Prior, Write Offs | 0 |  | 64
Total, Revolving Loans Write Offs | 0 |  | 12,730
Total, Revolving Converted to Term Loans, Write Offs | 0 |  | 0
YTD gross write-offs | 2,344 | 1,939 | 26,926
Total loans | 2,999,521 |  | 3,094,725
Commercial Portfolio Segment [Member] | Pass [Member] |  |  |
Loans originated in current year | 63,767 |  | 400,836
Loans originated year prior | 330,063 |  | 237,303
Loans originated three years prior | 225,877 |  | 203,190
Loans originated four years prior | 165,477 |  | 201,837
Loans originated five years prior | 189,361 |  | 27,359
Total, Loans Amortized Cost Basis by Origination Year Prior | 111,102 |  | 90,724
Total, Revolving Loans | 1,653,632 |  | 1,675,260
Total, Revolving Converted to Term Loans | 7,519 |  | 7,804
Total loans | 2,746,798 |  | 2,844,313
Total loans | 2,746,798 |  | 2,844,313
Commercial Portfolio Segment [Member] | Special Mention [Member] |  |  |
Loans originated in current year | 0 |  | 0
Loans originated year prior | 0 |  | 17,424
Loans originated three years prior | 17,017 |  | 740
Loans originated four years prior | 3,473 |  | 0
Loans originated five years prior | 0 |  | 9,117
Total, Loans Amortized Cost Basis by Origination Year Prior | 12,573 |  | 5,139
Total, Revolving Loans | 110,287 |  | 92,632
Total, Revolving Converted to Term Loans | 0 |  | 0
Total loans | 143,350 |  | 125,052
Total loans | 143,350 |  | 125,052
Commercial Portfolio Segment [Member] | Substandard [Member] |  |  |
Loans originated in current year | 0 |  | 50
Loans originated year prior | 0 |  | 5,070
Loans originated three years prior | 5,070 |  | 12,104
Loans originated four years prior | 10,560 |  | 6,773
Loans originated five years prior | 3,763 |  | 22,357
Total, Loans Amortized Cost Basis by Origination Year Prior | 28,132 |  | 6,256
Total, Revolving Loans | 61,099 |  | 67,553
Total, Revolving Converted to Term Loans | 749 |  | 222
Total loans | 109,373 |  | 120,385
Total loans | 109,373 |  | 120,385
Commercial Portfolio Segment [Member] | Doubtful [Member] |  |  |
Loans originated in current year |  |  | 1,857
Loans originated year prior |  |  | 0
Loans originated three years prior |  |  | 0
Loans originated four years prior |  |  | 3,118
Loans originated five years prior |  |  | 0
Total, Loans Amortized Cost Basis by Origination Year Prior |  |  | 0
Total, Revolving Loans |  |  | 0
Total, Revolving Converted to Term Loans |  |  | 0
Total loans |  |  | 4,975
Total loans |  |  | 4,975
Real Estate Construction Portfolio Segment [Member] |  |  |
Loans originated in current year | 6,121 |  | 22,562
Loans originated year prior | 33,786 |  | 60,065
Loans originated three years prior | 61,199 |  | 126,200
Loans originated four years prior | 122,648 |  | 93,115
Loans originated five years prior | 92,360 |  | 16,858
Total, Loans Amortized Cost Basis by Origination Year Prior | 14,819 |  | 0
Total, Revolving Loans | 886 |  | 0
Total, Revolving Converted to Term Loans | 0 |  | 0
Total loans | 331,819 |  | 318,800
Loans originated in current year, write offs | 0 |  | 0
Loans originated year prior, write offs | 0 |  | 0
Loans originated three years prior, write offs | 0 |  | 0
Loans originated four years prior, write offs | 0 |  | 0
Loans originated five years prior, write offs | 0 |  | 0
Total, Loans Amortized Cost Basis by Origination Year Prior, Write Offs | 0 |  | 0
Total, Revolving Loans Write Offs | 0 |  | 0
Total, Revolving Converted to Term Loans, Write Offs | 0 |  | 0
YTD gross write-offs | 0 | (0) | 0
Total loans | 331,819 |  | 318,800
Real Estate Construction Portfolio Segment [Member] | Pass [Member] |  |  |
Loans originated in current year | 6,121 |  | 22,562
Loans originated year prior | 33,786 |  | 55,835
Loans originated three years prior | 56,969 |  | 126,200
Loans originated four years prior | 120,548 |  | 57,546
Loans originated five years prior | 59,450 |  | 3,021
Total, Loans Amortized Cost Basis by Origination Year Prior | 3,113 |  | 0
Total, Revolving Loans | 886 |  | 0
Total, Revolving Converted to Term Loans | 0 |  | 0
Total loans | 280,873 |  | 265,164
Total loans | 280,873 |  | 265,164
Real Estate Construction Portfolio Segment [Member] | Special Mention [Member] |  |  |
Loans originated in current year | 0 |  | 0
Loans originated year prior | 0 |  | 0
Loans originated three years prior | 0 |  | 0
Loans originated four years prior | 2,100 |  | 35,569
Loans originated five years prior | 32,910 |  | 13,837
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 | 35,010 |  | 49,406
Total loans | 35,010 |  | 49,406
Real Estate Construction Portfolio Segment [Member] | Substandard [Member] |  |  |
Loans originated in current year | 0 |  | 0
Loans originated year prior | 0 |  | 4,230
Loans originated three years prior | 4,230 |  | 0
Loans originated four years prior | 0 |  | 0
Loans originated five years prior | 0 |  | 0
Total, Loans Amortized Cost Basis by Origination Year Prior | 11,706 |  | 0
Total, Revolving Loans | 0 |  | 0
Total, Revolving Converted to Term Loans | 0 |  | 0
Total loans | 15,936 |  | 4,230
Total loans | 15,936 |  | 4,230
Commercial Real Estate Portfolio Segment [Member] |  |  |
Loans originated in current year | 382,236 |  | 1,472,030
Loans originated year prior | 1,484,543 |  | 2,006,936
Loans originated three years prior | 1,990,115 |  | 1,807,297
Loans originated four years prior | 1,752,788 |  | 1,502,515
Loans originated five years prior | 1,467,260 |  | 832,435
Total, Loans Amortized Cost Basis by Origination Year Prior | 2,860,216 |  | 2,206,768
Total, Revolving Loans | 212,179 |  | 198,485
Total, Revolving Converted to Term Loans | 3,200 |  | 0
Total loans | 10,152,537 |  | 10,026,466
Loans originated in current year, write offs | 0 |  | 0
Loans originated year prior, write offs | 0 |  | 0
Loans originated three years prior, write offs | 0 |  | 0
Loans originated four years prior, write offs | 0 |  | 0
Loans originated five years prior, write offs | 0 |  | 296
Total, Loans Amortized Cost Basis by Origination Year Prior, Write Offs | 0 |  | 4,173
Total, Revolving Loans Write Offs | 0 |  | 0
Total, Revolving Converted to Term Loans, Write Offs | 0 |  | 0
YTD gross write-offs | 0 | 251 | 4,469
Total loans | 10,152,537 |  | 10,026,466
Commercial Real Estate Portfolio Segment [Member] | Pass [Member] |  |  |
Loans originated in current year | 362,249 |  | 1,463,225
Loans originated year prior | 1,482,810 |  | 1,987,280
Loans originated three years prior | 1,971,002 |  | 1,724,563
Loans originated four years prior | 1,679,321 |  | 1,428,124
Loans originated five years prior | 1,393,421 |  | 800,645
Total, Loans Amortized Cost Basis by Origination Year Prior | 2,740,738 |  | 2,108,143
Total, Revolving Loans | 187,137 |  | 180,394
Total, Revolving Converted to Term Loans | 0 |  | 0
Total loans | 9,816,678 |  | 9,692,374
Total loans | 9,816,678 |  | 9,692,374
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member] |  |  |
Loans originated in current year | 19,987 |  | 8,805
Loans originated year prior | 1,733 |  | 8,292
Loans originated three years prior | 7,765 |  | 28,465
Loans originated four years prior | 19,437 |  | 16,462
Loans originated five years prior | 11,420 |  | 24,844
Total, Loans Amortized Cost Basis by Origination Year Prior | 30,248 |  | 19,888
Total, Revolving Loans | 19,201 |  | 9,939
Total, Revolving Converted to Term Loans | 0 |  | 0
Total loans | 109,791 |  | 116,695
Total loans | 109,791 |  | 116,695
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member] |  |  |
Loans originated in current year | 0 |  | 0
Loans originated year prior | 0 |  | 11,364
Loans originated three years prior | 11,348 |  | 54,269
Loans originated four years prior | 54,030 |  | 57,929
Loans originated five years prior | 62,419 |  | 6,946
Total, Loans Amortized Cost Basis by Origination Year Prior | 89,230 |  | 78,737
Total, Revolving Loans | 5,841 |  | 8,152
Total, Revolving Converted to Term Loans | 3,200 |  | 0
Total loans | 226,068 |  | 217,397
Total loans | 226,068 |  | 217,397
Residential Portfolio Segment [Member] |  |  |
Loans originated in current year | 153,024 |  | 642,965
Loans originated year prior | 611,032 |  | 1,022,932
Loans originated three years prior | 985,739 |  | 1,019,204
Loans originated four years prior | 996,463 |  | 786,401
Loans originated five years prior | 762,755 |  | 456,847
Total, Loans Amortized Cost Basis by Origination Year Prior | 2,115,704 |  | 1,760,944
Total, Revolving Loans | 0 |  | 0
Total, Revolving Converted to Term Loans | 0 |  | 0
Total loans | 5,624,717 |  | 5,689,293
Loans originated in current year, write offs | 0 |  | 0
Loans originated year prior, write offs | 0 |  | 0
Loans originated three years prior, write offs | 0 |  | 0
Loans originated four years prior, write offs | 0 |  | 59
Loans originated five years prior, write offs | 0 |  | 0
Total, Loans Amortized Cost Basis by Origination Year Prior, Write Offs | 0 |  | 0
Total, Revolving Loans Write Offs | 0 |  | 0
Total, Revolving Converted to Term Loans, Write Offs | 0 |  | 0
YTD gross write-offs | 0 |  | 59
Total loans | 5,624,717 |  | 5,689,293
Residential Portfolio Segment [Member] | Pass [Member] |  |  |
Loans originated in current year | 152,995 |  | 642,568
Loans originated year prior | 609,493 |  | 1,020,419
Loans originated three years prior | 983,090 |  | 1,014,842
Loans originated four years prior | 988,664 |  | 781,218
Loans originated five years prior | 758,304 |  | 452,623
Total, Loans Amortized Cost Basis by Origination Year Prior | 2,094,351 |  | 1,745,923
Total, Revolving Loans | 0 |  | 0
Total, Revolving Converted to Term Loans | 0 |  | 0
Total loans | 5,586,897 |  | 5,657,593
Total loans | 5,586,897 |  | 5,657,593
Residential Portfolio Segment [Member] | Special Mention [Member] |  |  |
Loans originated in current year | 0 |  | 0
Loans originated year prior | 498 |  | 0
Loans originated three years prior | 375 |  | 0
Loans originated four years prior | 3,027 |  | 0
Loans originated five years prior | 831 |  | 33
Total, Loans Amortized Cost Basis by Origination Year Prior | 7,254 |  | 1,585
Total, Revolving Loans | 0 |  | 0
Total, Revolving Converted to Term Loans | 0 |  | 0
Total loans | 11,985 |  | 1,618
Total loans | 11,985 |  | 1,618
Residential Portfolio Segment [Member] | Substandard [Member] |  |  |
Loans originated in current year | 29 |  | 397
Loans originated year prior | 1,041 |  | 2,513
Loans originated three years prior | 2,274 |  | 4,362
Loans originated four years prior | 4,772 |  | 5,183
Loans originated five years prior | 3,620 |  | 4,191
Total, Loans Amortized Cost Basis by Origination Year Prior | 14,099 |  | 13,436
Total, Revolving Loans | 0 |  | 0
Total, Revolving Converted to Term Loans | 0 |  | 0
Total loans | 25,835 |  | 30,082
Total loans | 25,835 |  | 30,082
Equity Lines Portfolio Segment [Member] |  |  |
Loans originated in current year | 0 |  | 0
Loans originated year prior | 0 |  | 0
Loans originated three years prior | 0 |  | 72
Loans originated four years prior | 0 |  | 0
Loans originated five years prior | 0 |  | 0
Total, Loans Amortized Cost Basis by Origination Year Prior | 0 |  | 0
Total, Revolving Loans | 214,588 |  | 214,301
Total, Revolving Converted to Term Loans | 17,310 |  | 16,449
Total loans | 231,898 |  | 230,822
Loans originated in current year, write offs | 0 |  | 0
Loans originated year prior, write offs | 0 |  | 0
Loans originated three years prior, write offs | 0 |  | 0
Loans originated four years prior, write offs | 0 |  | 0
Loans originated five years prior, write offs | 0 |  | 0
Total, Loans Amortized Cost Basis by Origination Year Prior, Write Offs | 0 |  | 0
Total, Revolving Loans Write Offs | 0 |  | 3
Total, Revolving Converted to Term Loans, Write Offs | 0 |  | 0
YTD gross write-offs | 0 |  | 3
Total loans | 231,898 |  | 230,822
Equity Lines Portfolio Segment [Member] | Pass [Member] |  |  |
Loans originated in current year | 0 |  | 0
Loans originated year prior | 0 |  | 0
Loans originated three years prior | 0 |  | 72
Loans originated four years prior | 0 |  | 0
Loans originated five years prior | 0 |  | 0
Total, Loans Amortized Cost Basis by Origination Year Prior | 0 |  | 0
Total, Revolving Loans | 211,828 |  | 211,374
Total, Revolving Converted to Term Loans | 17,163 |  | 16,277
Total loans | 228,991 |  | 227,723
Total loans | 228,991 |  | 227,723
Equity Lines Portfolio Segment [Member] | Special Mention [Member] |  |  |
Loans originated in current year |  |  | 0
Loans originated year prior |  |  | 0
Loans originated three years prior |  |  | 0
Loans originated four years prior |  |  | 0
Loans originated five years prior |  |  | 0
Total, Loans Amortized Cost Basis by Origination Year Prior |  |  | 0
Total, Revolving Loans |  |  | 0
Total, Revolving Converted to Term Loans |  |  | 11
Total loans |  |  | 11
Total loans |  |  | 11
Equity Lines Portfolio Segment [Member] | Substandard [Member] |  |  |
Loans originated in current year | 0 |  | 0
Loans originated year prior | 0 |  | 0
Loans originated three years prior | 0 |  | 0
Loans originated four years prior | 0 |  | 0
Loans originated five years prior | 0 |  | 0
Total, Loans Amortized Cost Basis by Origination Year Prior | 0 |  | 0
Total, Revolving Loans | 2,760 |  | 2,927
Total, Revolving Converted to Term Loans | 147 |  | 161
Total loans | 2,907 |  | 3,088
Total loans | 2,907 |  | 3,088
Installment and Other Loans [Member ] |  |  |
Loans originated in current year | 0 |  | 5,264
Loans originated year prior | 0 |  | 0
Loans originated three years prior | 0 |  | 44
Loans originated four years prior | 854 |  | 0
Loans originated five years prior | 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 | 854 |  | 5,308
Loans originated in current year, write offs | 0 |  | 0
Loans originated year prior, write offs | 0 |  | 0
Loans originated three years prior, write offs | 0 |  | 15
Loans originated four years prior, write offs | 0 |  | 0
Loans originated five years prior, write offs | 0 |  | 0
Total, Loans Amortized Cost Basis by Origination Year Prior, Write Offs | 0 |  | 0
Total, Revolving Loans Write Offs | 0 |  | 0
Total, Revolving Converted to Term Loans, Write Offs | 0 |  | 0
YTD gross write-offs | 0 | $ (0) | 15
Total loans | 854 |  | 5,308
Installment and Other Loans [Member ] | Pass [Member] |  |  |
Loans originated in current year | 0 |  | 5,264
Loans originated year prior | 0 |  | 0
Loans originated three years prior | 0 |  | 44
Loans originated four years prior | 854 |  | 0
Loans originated five years prior | 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 | 854 |  | 5,308
Total loans | $ 854 |  | $ 5,308

X
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- Definition Amortized cost of financing receivable originated in fiscal year prior to current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 + Details
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- Definition Amount of writeoff of financing receivable originated more than five years before current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 + Details
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- Definition Amortized cost of financing receivable originated three years prior to current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 + Details
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