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Note 8 - Loans (Tables) | 3 Months Ended
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Mar. 31, 2021
Notes Tables |
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] |
|  | March 31, 2021 |  |  | December 31, 2020 |
|  | (In thousands) |
Commercial loans |  | $ | 2,890,693 |  |  | $ | 2,836,833 |
Residential mortgage loans |  |  | 4,102,203 |  |  |  | 4,145,389 |
Commercial mortgage loans |  |  | 7,549,522 |  |  |  | 7,555,027 |
Real estate construction loans |  |  | 677,816 |  |  |  | 679,492 |
Equity lines |  |  | 428,318 |  |  |  | 424,555 |
Installment and other loans |  |  | 3,296 |  |  |  | 3,100 |
Gross loans |  | $ | 15,651,848 |  |  | $ | 15,644,396 |
Allowance for loan losses |  |  | (147,264 | ) |  |  | (166,538 | )
Unamortized deferred loan fees, net |  |  | (6,872 | ) |  |  | (2,494 | )
Total loans, net |  | $ | 15,497,712 |  |  | $ | 15,475,364 |
Impaired Financing Receivables [Table Text Block] |
|  | Three Months Ended March 31, |
|  | 2021 |
|  | Average Recorded Investment |  |  | Interest Income Recognized |
|  | (In thousands) |
Commercial loans |  | $ | 28,268 |  |  | $ | 12 |
Real estate construction loans |  |  | 4,229 |  |  |  | 97 |
Commercial mortgage loans |  |  | 40,116 |  |  |  | 57 |
Residential mortgage loans and equity lines |  |  | 8,427 |  |  |  | 8 |
Total non-accrual loans |  | $ | 81,040 |  |  | $ | 174 |
|  | Three Months Ended March 31, |
|  | 2020 |
|  | Average Recorded Investment |  |  | Interest Income Recognized |
|  | (In thousands) |
Commercial loans |  | $ | 28,316 |  |  | $ | 70 |
Real estate construction loans |  |  | 4,506 |  |  |  | 98 |
Commercial mortgage loans |  |  | 36,040 |  |  |  | 459 |
Residential mortgage loans and equity lines |  |  | 11,371 |  |  |  | 71 |
Total impaired loans |  | $ | 80,233 |  |  | $ | 698 |
Schedule Of Impaired Loans And Related Allowance And Charge Off [Table Text Block] |
|  | March 31, 2021 |
|  | Unpaid Principal Balance |  |  | Recorded Investment |  |  | Allowance |
|  | (In thousands) |
With no allocated allowance |  |  |  |  |  |  |  |  |  |  |  |
Commercial loans |  | $ | 30,111 |  |  | $ | 18,534 |  |  | $ | — |
Real estate construction loans |  |  | 5,776 |  |  |  | 4,189 |  |  |  | — |
Commercial mortgage loans |  |  | 27,867 |  |  |  | 27,199 |  |  |  | — |
Residential mortgage loans and equity lines |  |  | 9,205 |  |  |  | 8,545 |  |  |  | — |
Subtotal |  | $ | 72,959 |  |  | $ | 58,467 |  |  | $ | — |
With allocated allowance |  |  |  |  |  |  |  |  |  |  |  |
Commercial loans |  | $ | 19,864 |  |  | $ | 19,817 |  |  | $ | 5,559 |
Commercial mortgage loans |  |  | 16,233 |  |  |  | 16,162 |  |  |  | 5,133 |
Subtotal |  | $ | 36,097 |  |  | $ | 35,979 |  |  | $ | 10,692 |
Total non-accrual loans |  | $ | 109,056 |  |  | $ | 94,446 |  |  | $ | 10,692 |
|  | December 31, 2020 |
|  | Unpaid Principal Balance |  |  | Recorded Investment |  |  | Allowance |
|  |  |  |  |  |  | (In thousands) |  |  |  |  |
With no allocated allowance |  |  |  |  |  |  |  |  |  |  |  |
Commercial loans |  | $ | 23,784 |  |  | $ | 20,698 |  |  | $ | — |
Real estate construction loans |  |  | 5,776 |  |  |  | 4,286 |  |  |  | — |
Commercial mortgage loans |  |  | 22,877 |  |  |  | 22,287 |  |  |  | — |
Residential mortgage loans and equity lines |  |  | 6,379 |  |  |  | 6,307 |  |  |  | — |
Subtotal |  | $ | 58,816 |  |  | $ | 53,578 |  |  | $ | — |
With allocated allowance |  |  |  |  |  |  |  |  |  |  |  |
Commercial loans |  | $ | 13,703 |  |  | $ | 6,372 |  |  | $ | 1,030 |
Commercial mortgage loans |  |  | 31,134 |  |  |  | 31,003 |  |  |  | 5,254 |
Residential mortgage loans and equity lines |  |  | 5,005 |  |  |  | 4,452 |  |  |  | 145 |
Subtotal |  | $ | 49,842 |  |  | $ | 41,827 |  |  | $ | 6,429 |
Total impaired loans |  | $ | 108,658 |  |  | $ | 95,405 |  |  | $ | 6,429 |
Financing Receivable, Past Due [Table Text Block] |
|  | March 31, 2021 |
|  | 30-59 Days Past Due |  |  | 60-89 Days Past Due |  |  | 90 Days or More Past Due |  |  | Non-accrual Loans |  |  | Total Past Due |  |  | Loans Not Past Due |  |  | Total |
|  | (In thousands) |
Commercial loans |  | $ | 13,845 |  |  | $ | 1,645 |  |  | $ | 1,880 |  |  | $ | 38,351 |  |  | $ | 55,721 |  |  | $ | 2,834,972 |  |  | $ | 2,890,693 |
Real estate construction loans |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 4,189 |  |  |  | 4,189 |  |  |  | 673,627 |  |  |  | 677,816 |
Commercial mortgage loans |  |  | 6,659 |  |  |  | 274 |  |  |  | 258 |  |  |  | 43,361 |  |  |  | 50,552 |  |  |  | 7,498,970 |  |  |  | 7,549,522 |
Residential mortgage loans and equity lines |  |  | 21,298 |  |  |  | 345 |  |  |  | — |  |  |  | 8,545 |  |  |  | 30,188 |  |  |  | 4,500,333 |  |  |  | 4,530,521 |
Installment and other loans |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 3,296 |  |  |  | 3,296 |
Total loans |  | $ | 41,802 |  |  | $ | 2,264 |  |  | $ | 2,138 |  |  | $ | 94,446 |  |  | $ | 140,650 |  |  | $ | 15,511,198 |  |  | $ | 15,651,848 |
|  | December 31, 2020 |
|  | 30-59 Days Past Due |  |  | 60-89 Days Past Due |  |  | 90 Days or More Past Due |  |  | Non-accrual Loans |  |  | Total Past Due |  |  | Loans Not Past Due |  |  | Total |
|  | (In thousands) |
Commercial loans |  | $ | 52,601 |  |  | $ | 3,182 |  |  | $ | 2,947 |  |  | $ | 23,087 |  |  | $ | 81,817 |  |  | $ | 2,755,016 |  |  | $ | 2,836,833 |
Real estate construction loans |  |  | 6,257 |  |  |  | — |  |  |  | — |  |  |  | 4,286 |  |  |  | 10,543 |  |  |  | 668,949 |  |  |  | 679,492 |
Commercial mortgage loans |  |  | 45,186 |  |  |  | 18,069 |  |  |  | 2,035 |  |  |  | 33,715 |  |  |  | 99,005 |  |  |  | 7,456,022 |  |  |  | 7,555,027 |
Residential mortgage loans and equity lines |  |  | 14,315 |  |  |  | 4,223 |  |  |  | — |  |  |  | 6,596 |  |  |  | 25,134 |  |  |  | 4,544,810 |  |  |  | 4,569,944 |
Installment and other loans |  |  | 43 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 43 |  |  |  | 3,057 |  |  |  | 3,100 |
Total loans |  | $ | 118,402 |  |  | $ | 25,474 |  |  | $ | 4,982 |  |  | $ | 67,684 |  |  | $ | 216,542 |  |  | $ | 15,427,854 |  |  | $ | 15,644,396 |
Schedule Of Troubled Debt Restructurings [Table Text Block] |
|  | Three Months Ended March 31, 2021 |  |  | March 31, 2021 |
|  | No. of Contracts |  |  | Pre-Modification Outstanding Recorded Investment |  |  | Post-Modification Outstanding Recorded Investment |  |  | Charge-offs |  |  | Specific Reserve |
|  | (In thousands) |
Commercial loans |  |  | 1 |  |  | $ | 686 |  |  | $ | 686 |  |  | $ | — |  |  | $ | — |
Total |  |  | 1 |  |  | $ | 686 |  |  | $ | 686 |  |  | $ | — |  |  | $ | — |
|  | Three Months Ended March 31, 2020 |  |  | March 31, 2020 |
|  | No. of Contracts |  |  | Pre-Modification Outstanding Recorded Investment |  |  | Post-Modification Outstanding Recorded Investment |  |  | Charge-offs |  |  | Specific Reserve |
|  | (In thousands) |
Commercial loans |  |  | 2 |  |  | $ | 534 |  |  | $ | 534 |  |  | $ | — |  |  | $ | — |
Total |  |  | 2 |  |  | $ | 534 |  |  | $ | 534 |  |  | $ | — |  |  | $ | — |
Financing Receivable, Troubled Debt Restructuring [Table Text Block] |
|  | March 31, 2021 |
|  | Payment Deferral |  |  | Rate Reduction |  |  | Rate Reduction and Payment Deferral |  |  | Total |
|  | (In thousands) |
Accruing TDRs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial loans |  | $ | 4,544 |  |  | $ | — |  |  | $ | — |  |  | $ | 4,544 |
Commercial mortgage loans |  |  | 524 |  |  |  | 5,607 |  |  |  | 13,322 |  |  |  | 19,453 |
Residential mortgage loans |  |  | 1,686 |  |  |  | 262 |  |  |  | 1,919 |  |  |  | 3,867 |
Total accruing TDRs |  | $ | 6,754 |  |  | $ | 5,869 |  |  | $ | 15,241 |  |  | $ | 27,864 |
|  | December 31, 2020 |
|  | Payment Deferral |  |  | Rate Reduction |  |  | Rate Reduction and Payment Deferral |  |  | Total |
|  | (In thousands) |
Accruing TDRs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial loans |  | $ | 3,983 |  |  | $ | — |  |  | $ | — |  |  | $ | 3,983 |
Commercial mortgage loans |  |  | 515 |  |  |  | 5,635 |  |  |  | 13,425 |  |  |  | 19,575 |
Residential mortgage loans |  |  | 1,724 |  |  |  | 275 |  |  |  | 2,164 |  |  |  | 4,163 |
Total accruing TDRs |  | $ | 6,222 |  |  | $ | 5,910 |  |  | $ | 15,589 |  |  | $ | 27,721 |
Non Accrual Troubled Debt Restructurings [Table Text Block] |
|  | March 31, 2021 |
|  | Payment Deferral |  |  | Rate Reduction |  |  | Rate Reduction and Payment Deferral |  |  | Total |
|  | (In thousands) |
Non-accrual TDRs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial loans |  | $ | 8,150 |  |  | $ | — |  |  | $ | — |  |  | $ | 8,150 |
Residential mortgage loans |  |  | 511 |  |  |  | — |  |  |  | — |  |  |  | 511 |
Total non-accrual TDRs |  | $ | 8,661 |  |  | $ | — |  |  | $ | — |  |  | $ | 8,661 |
|  | December 31, 2020 |
|  | Payment Deferral |  |  | Rate Reduction |  |  | Rate Reduction and Payment Deferral |  |  | Total |
|  | (In thousands) |
Non-accrual TDRs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial loans |  | $ | 8,462 |  |  | $ | — |  |  | $ | — |  |  | $ | 8,462 |
Residential mortgage loans |  |  | 523 |  |  |  | — |  |  |  | — |  |  |  | 523 |
Total non-accrual TDRs |  | $ | 8,985 |  |  | $ | — |  |  | $ | — |  |  | $ | 8,985 |
Activity Within The Troubled Debt Resturings [Table Text Block] |
|  | Three Months Ended March 31, |
|  | 2021 |  |  | 2020 |
|  | (In thousands) |
Accruing TDRs |  |  |  |  |  |  |  |
Beginning balance |  | $ | 27,721 |  |  | $ | 35,336 |
New restructurings |  |  | 686 |  |  |  | 534 |
Payments |  |  | (543 | ) |  |  | (1,506 | )
Ending balance |  | $ | 27,864 |  |  | $ | 34,364 |
|  | Three Months Ended March 31, |
|  | 2021 |  |  | 2020 |
|  | (In thousands) |
Non-accrual TDRs |  |  |  |  |  |  |  |
Beginning balance |  | $ | 8,985 |  |  | $ | 18,048 |
Payments |  |  | (324 | ) |  |  | (159 | )
Ending balance |  | $ | 8,661 |  |  | $ | 17,889 |
Financing Receivable Credit Quality Indicators [Table Text Block] |
|  | December 31, 2020 |
|  | Pass/Watch |  |  | Special Mention |  |  | Substandard |  |  | Doubtful |  |  | Total |
|  | (In thousands) |
Commercial loans |  | $ | 2,581,128 |  |  | $ | 141,344 |  |  | $ | 108,788 |  |  | $ | 5,573 |  |  | $ | 2,836,833 |
Real estate construction loans |  |  | 593,196 |  |  |  | 82,010 |  |  |  | 4,286 |  |  |  | — |  |  |  | 679,492 |
Commercial mortgage loans |  |  | 7,202,568 |  |  |  | 186,283 |  |  |  | 166,176 |  |  |  | — |  |  |  | 7,555,027 |
Residential mortgage loans and equity lines |  |  | 4,547,052 |  |  |  | 11,647 |  |  |  | 11,245 |  |  |  | — |  |  |  | 4,569,944 |
Installment and other loans |  |  | 3,100 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 3,100 |
Total gross loans |  | $ | 14,927,044 |  |  | $ | 421,284 |  |  | $ | 290,495 |  |  | $ | 5,573 |  |  | $ | 15,644,396 |
Loan Held for Investment by Loan Portfolio Segments, Internal Risk Ratings and Vintage Year [Table Text Block] |
|  | Loans Amortized Cost Basis by Origination Year |  |  |  |  |  |  |  |  |  |  |  |  |
March 31, 2021 |  | 2021 |  |  | 2020 |  |  | 2019 |  |  | 2018 |  |  | 2017 |  |  | Prior |  |  | Revolving Loans |  |  | Revolving Converted to Term Loans |  |  | Total |
|  | (In thousands) |
Commercial loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pass |  | $ | 255,423 |  |  | $ | 527,049 |  |  | $ | 316,832 |  |  | $ | 245,195 |  |  | $ | 125,699 |  |  | $ | 94,080 |  |  | $ | 1,088,480 |  |  | $ | 8,055 |  |  | $ | 2,660,813 |
Special Mention |  |  | — |  |  |  | 100 |  |  |  | 16,458 |  |  |  | 7,535 |  |  |  | 3,265 |  |  |  | 31 |  |  |  | 43,466 |  |  |  | 246 |  |  |  | 71,101 |
Substandard |  |  | — |  |  |  | 11,537 |  |  |  | 20,564 |  |  |  | 29,395 |  |  |  | 10,834 |  |  |  | 4,738 |  |  |  | 67,426 |  |  |  | 6,207 |  |  |  | 150,701 |
Doubtful |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 2,244 |  |  |  | — |  |  |  | 2,244 |
Total |  |  | 255,423 |  |  |  | 538,686 |  |  |  | 353,854 |  |  |  | 282,125 |  |  |  | 139,798 |  |  |  | 98,849 |  |  |  | 1,201,616 |  |  |  | 14,508 |  |  |  | 2,884,859 |
YTD period charge-offs |  |  | — |  |  |  | 23 |  |  |  | 50 |  |  |  | 366 |  |  |  | — |  |  |  | — |  |  |  | 8,699 |  |  |  | — |  |  |  | 9,138 |
YTD period recoveries |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (4 | ) |  |  | — |  |  |  | (156 | ) |  |  | (1,109 | ) |  |  | — |  |  |  | (1,269 | )
Net |  |  | — |  |  |  | 23 |  |  |  | 50 |  |  |  | 362 |  |  |  | — |  |  |  | (156 | ) |  |  | 7,590 |  |  |  | — |  |  |  | 7,869 |
Real estate construction loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pass |  |  | 38,405 |  |  |  | 224,620 |  |  |  | 162,973 |  |  |  | 131,063 |  |  |  | 58,557 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 615,618 |
Special Mention |  |  | — |  |  |  | 33,083 |  |  |  | 6,373 |  |  |  | 15,822 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 55,278 |
Substandard |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 4,189 |  |  |  | — |  |  |  | — |  |  |  | 4,189 |
Total |  |  | 38,405 |  |  |  | 257,703 |  |  |  | 169,346 |  |  |  | 146,885 |  |  |  | 58,557 |  |  |  | 4,189 |  |  |  | — |  |  |  | — |  |  |  | 675,085 |
YTD period charge-offs |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
YTD period recoveries |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Net |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Commercial mortgage loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pass |  |  | 325,895 |  |  |  | 1,393,092 |  |  |  | 1,373,968 |  |  |  | 1,283,094 |  |  |  | 933,711 |  |  |  | 1,723,499 |  |  |  | 171,529 |  |  |  | — |  |  |  | 7,204,788 |
Special Mention |  |  | — |  |  |  | 23,492 |  |  |  | 29,476 |  |  |  | 22,138 |  |  |  | 26,290 |  |  |  | 88,360 |  |  |  | 5,753 |  |  |  | — |  |  |  | 195,509 |
Substandard |  |  | — |  |  |  | 628 |  |  |  | 6,832 |  |  |  | 47,145 |  |  |  | 3,608 |  |  |  | 89,479 |  |  |  | 377 |  |  |  | — |  |  |  | 148,069 |
Total |  |  | 325,895 |  |  |  | 1,417,212 |  |  |  | 1,410,276 |  |  |  | 1,352,377 |  |  |  | 963,609 |  |  |  | 1,901,338 |  |  |  | 177,659 |  |  |  | — |  |  |  | 7,548,366 |
YTD period charge-offs |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
YTD period recoveries |  |  | — |  |  |  | — |  |  |  | (60 | ) |  |  | — |  |  |  | — |  |  |  | (7 | ) |  |  | (28 | ) |  |  | — |  |  |  | (95 | )
Net |  |  | — |  |  |  | — |  |  |  | (60 | ) |  |  | — |  |  |  | — |  |  |  | (7 | ) |  |  | (28 | ) |  |  | — |  |  |  | (95 | )
Residential mortgage loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pass |  |  | 182,269 |  |  |  | 749,890 |  |  |  | 820,791 |  |  |  | 635,500 |  |  |  | 546,962 |  |  |  | 1,146,581 |  |  |  | — |  |  |  | — |  |  |  | 4,081,993 |
Special Mention |  |  | — |  |  |  | 334 |  |  |  | 4,749 |  |  |  | 3,170 |  |  |  | 1,717 |  |  |  | 4,023 |  |  |  | — |  |  |  | — |  |  |  | 13,993 |
Substandard |  |  | — |  |  |  | 18 |  |  |  | 809 |  |  |  | 2,300 |  |  |  | 564 |  |  |  | 4,140 |  |  |  | — |  |  |  | — |  |  |  | 7,831 |
Total |  |  | 182,269 |  |  |  | 750,242 |  |  |  | 826,349 |  |  |  | 640,970 |  |  |  | 549,243 |  |  |  | 1,154,744 |  |  |  | — |  |  |  | — |  |  |  | 4,103,817 |
YTD period charge-offs |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
YTD period recoveries |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (7 | ) |  |  | — |  |  |  | — |  |  |  | (7 | )
Net |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (7 | ) |  |  | — |  |  |  | — |  |  |  | (7 | )
Equity lines |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pass |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 10 |  |  |  | 392,712 |  |  |  | 34,804 |  |  |  | 427,526 |
Special Mention |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 925 |  |  |  | — |  |  |  | 925 |
Substandard |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 330 |  |  |  | 729 |  |  |  | 1,059 |
Total |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 10 |  |  |  | 393,967 |  |  |  | 35,533 |  |  |  | 429,510 |
YTD period charge-offs |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
YTD period recoveries |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (3 | ) |  |  | (6 | ) |  |  | (9 | )
Net |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (3 | ) |  |  | (6 | ) |  |  | (9 | )
Installment and other loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pass |  |  | 953 |  |  |  | 2,386 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 3,339 |
Total |  |  | 953 |  |  |  | 2,386 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 3,339 |
YTD period charge-offs |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
YTD period recoveries |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Net |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Total loans |  | $ | 802,945 |  |  | $ | 2,966,229 |  |  | $ | 2,759,825 |  |  | $ | 2,422,357 |  |  | $ | 1,711,207 |  |  | $ | 3,159,130 |  |  | $ | 1,773,242 |  |  | $ | 50,041 |  |  | $ | 15,644,976 |
Net charge-offs/(recoveries) |  | $ | — |  |  | $ | 23 |  |  | $ | (10 | ) |  | $ | 362 |  |  | $ | — |  |  | $ | (170 | ) |  | $ | 7,559 |  |  | $ | (6 | ) |  | $ | 7,758 |
Financing Receivable, Allowance for Credit Loss [Table Text Block] |
|  |  |  |  |  |  |  |  |  |  |  |  |  | Residential |  |  |  |  |  |  |  |  |
|  |  |  |  |  | Real Estate |  |  | Commercial |  |  | Mortgage Loans |  |  | Installment |  |  |  |  |
|  | Commercial |  |  | Construction |  |  | Mortgage |  |  | and |  |  | and Other |  |  |  |  |
|  | Loans |  |  | Loans |  |  | Loans |  |  | Equity Lines |  |  | Loans |  |  | Total |
|  | (In thousands) |
2021 Beginning Balance |  | $ | 68,742 |  |  | $ | 30,854 |  |  | $ | 49,205 |  |  | $ | 17,737 |  |  | $ | — |  |  | $ | 166,538 |
Impact of ASU 2016-13 adoption |  |  | (28,748 | ) |  |  | (25,332 | ) |  |  | 35,335 |  |  |  | 19,330 |  |  |  | 9 |  |  |  | 594 |
Allowance for loan losses, January 1, 2021 |  |  | 39,994 |  |  |  | 5,522 |  |  |  | 84,540 |  |  |  | 37,067 |  |  |  | 9 |  |  |  | 167,132 |
Provision/(reversal) for possible credit losses |  |  | 12,627 |  |  |  | 446 |  |  |  | (18,946 | ) |  |  | (6,231 | ) |  |  | (6 | ) |  |  | (12,110 | )
Charge-offs |  |  | (9,138 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (9,138 | )
Recoveries |  |  | 1,269 |  |  |  | — |  |  |  | 95 |  |  |  | 16 |  |  |  | — |  |  |  | 1,380 |
Net (charge-offs)/recoveries |  |  | (7,869 | ) |  |  | — |  |  |  | 95 |  |  |  | 16 |  |  |  | — |  |  |  | (7,758 | )
March 31, 2021 Ending Balance |  | $ | 44,752 |  |  | $ | 5,968 |  |  | $ | 65,689 |  |  | $ | 30,852 |  |  | $ | 3 |  |  | $ | 147,264 |
Allowance for unfunded credit commitments December 31, 2020 |  | $ | 4,802 |  |  | $ | 690 |  |  | $ | 101 |  |  | $ | 284 |  |  | $ | 3 |  |  | $ | 5,880 |
Impact of ASU 2016-13 adoption |  |  | (3,347 | ) |  |  | 4,274 |  |  |  | (101 | ) |  |  | (284 | ) |  |  | (3 | ) |  |  | 539 |
Allowance for loan losses, January 1, 2021 |  |  | 1,455 |  |  |  | 4,964 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 6,419 |
Provision/(reversal) for possible credit losses |  |  | 125 |  |  |  | (1,574 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (1,449 | )
Allowance for unfunded credit commitments March 31, 2021 |  | $ | 1,580 |  |  | $ | 3,390 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 4,970 |
|  |  |  |  |  |  |  |  |  |  |  |  |  | Residential |  |  |  |  |  |  |  |  |
|  |  |  |  |  | Real Estate |  |  | Commercial |  |  | Mortgage Loans |  |  | Installment |  |  |  |  |
|  | Commercial |  |  | Construction |  |  | Mortgage |  |  | and |  |  | and Other |  |  |  |  |
|  | Loans |  |  | Loans |  |  | Loans |  |  | Equity Lines |  |  | Loans |  |  | Total |
|  | (In thousands) |
2020 Beginning Balance |  | $ | 57,021 |  |  | $ | 19,474 |  |  | $ | 33,602 |  |  | $ | 13,108 |  |  | $ | 19 |  |  | $ | 123,224 |
Provision/(reversal) for possible credit losses |  |  | 10,891 |  |  |  | 3,748 |  |  |  | 6,129 |  |  |  | 4,251 |  |  |  | (19 | ) |  |  | 25,000 |
Charge-offs |  |  | (1,321 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (1,321 | )
Recoveries |  |  | 1,208 |  |  |  | — |  |  |  | 155 |  |  |  | 7 |  |  |  | — |  |  |  | 1,370 |
Net (charge-offs)/recoveries |  |  | (113 | ) |  |  | — |  |  |  | 155 |  |  |  | 7 |  |  |  | — |  |  |  | 49 |
March 31, 2020 Ending Balance |  | $ | 67,799 |  |  | $ | 23,222 |  |  | $ | 39,886 |  |  | $ | 17,366 |  |  | $ | — |  |  | $ | 148,273 |
Reserve for impaired loans |  | $ | 2,827 |  |  | $ | — |  |  | $ | 405 |  |  | $ | 219 |  |  | $ | — |  |  | $ | 3,451 |
Reserve for non-impaired loans |  | $ | 64,972 |  |  | $ | 23,222 |  |  | $ | 39,481 |  |  | $ | 17,147 |  |  | $ | — |  |  | $ | 144,822 |
Reserve for off-balance sheet credit commitments |  | $ | 1,296 |  |  | $ | 1,233 |  |  | $ | 177 |  |  | $ | 304 |  |  | $ | 3 |  |  | $ | 3,013 |
Impairment Method [Member] |
Notes Tables |
Impaired Financing Receivables [Table Text Block] |
|  | December 31, 2020 |
|  |  |  |  |  | Real Estate |  |  | Commercial |  |  | Residential |  |  | Installment |  |  |  |  |
|  | Commercial |  |  | Construction |  |  | Mortgage |  |  | Mortgage Loans |  |  | and |  |  |  |  |
|  | Loans |  |  | Loans |  |  | Loans |  |  | and Equity Lines |  |  | Other Loans |  |  | Total |
|  | (In thousands) |
Loans individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance |  | $ | 1,030 |  |  | $ | — |  |  | $ | 5,254 |  |  | $ | 145 |  |  | $ | — |  |  | $ | 6,429 |
Balance |  | $ | 27,070 |  |  | $ | 4,286 |  |  | $ | 53,289 |  |  | $ | 10,760 |  |  | $ | — |  |  | $ | 95,405 |
Loans collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance |  | $ | 67,712 |  |  | $ | 30,854 |  |  | $ | 43,951 |  |  | $ | 17,592 |  |  | $ | — |  |  | $ | 160,109 |
Balance |  | $ | 2,809,763 |  |  | $ | 675,206 |  |  | $ | 7,501,738 |  |  | $ | 4,559,184 |  |  | $ | 3,100 |  |  | $ | 15,548,991 |
Total allowance |  | $ | 68,742 |  |  | $ | 30,854 |  |  | $ | 49,205 |  |  | $ | 17,737 |  |  | $ | — |  |  | $ | 166,538 |
Total balance |  | $ | 2,836,833 |  |  | $ | 679,492 |  |  | $ | 7,555,027 |  |  | $ | 4,569,944 |  |  | $ | 3,100 |  |  | $ | 15,644,396 |

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