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Loans - Risk Category of Mortgage and Non-mortgage Loans (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
2023 | $ 461,365 |  | $ 461,365 |  |
2022 | 1,178,656 |  | 1,178,656 |  |
2021 | 737,028 |  | 737,028 |  |
2020 | 563,345 |  | 563,345 |  |
2019 | 738,572 |  | 738,572 |  |
Prior | 2,857,484 |  | 2,857,484 |  |
Revolving Loans Amortized Cost Basis | 358,050 |  | 358,050 |  |
Revolving Loans converted to term loans | 12,213 |  | 12,213 |  |
Total Loans | 6,906,713 |  | 6,906,713 |  | $ 6,934,769
Gross charge-offs |  |  |  |  |
2021 |  |  | 1,675 |  |
2019 |  |  | 14 |  |
Prior |  |  | 94 |  |
Revolving Loans Amortized Cost Basis |  |  | 9,267 |  |
Charge-offs | 21 | $ 324 | 11,050 | $ 1,410 |
Basis adjustments | 10,639 |  | 10,639 |  |
Portfolio Layer Hedges on Closed Portfolio of Loans [Member] | Designated as Hedging Instrument [Member] |  |  |  |  |
Gross charge-offs |  |  |  |  |
Basis adjustments | 10,600 |  | 10,600 |  |
Pass |  |  |  |  |
2023 | 436,388 |  | 436,388 |  |
2022 | 1,168,374 |  | 1,168,374 |  |
2021 | 725,559 |  | 725,559 |  |
2020 | 558,968 |  | 558,968 |  |
2019 | 697,771 |  | 697,771 |  |
Prior | 2,689,947 |  | 2,689,947 |  |
Revolving Loans Amortized Cost Basis | 345,899 |  | 345,899 |  |
Revolving Loans converted to term loans | 10,252 |  | 10,252 |  |
Total Loans | 6,633,158 |  | 6,633,158 |  |
Watch |  |  |  |  |
2023 | 10,042 |  | 10,042 |  |
2022 | 7,828 |  | 7,828 |  |
2021 | 5,732 |  | 5,732 |  |
2020 | 4,377 |  | 4,377 |  |
2019 | 26,343 |  | 26,343 |  |
Prior | 139,456 |  | 139,456 |  |
Revolving Loans Amortized Cost Basis | 2,747 |  | 2,747 |  |
Revolving Loans converted to term loans | 1,321 |  | 1,321 |  |
Total Loans | 197,846 |  | 197,846 |  |
Special Mention |  |  |  |  |
2021 | 5,419 |  | 5,419 |  |
2019 | 14,430 |  | 14,430 |  |
Prior | 2,650 |  | 2,650 |  |
Revolving Loans Amortized Cost Basis | 2,000 |  | 2,000 |  |
Revolving Loans converted to term loans | 197 |  | 197 |  |
Total Loans | 24,696 |  | 24,696 |  |
Substandard |  |  |  |  |
2023 | 14,935 |  | 14,935 |  |
2022 | 2,454 |  | 2,454 |  |
2021 | 318 |  | 318 |  |
2019 | 28 |  | 28 |  |
Prior | 25,431 |  | 25,431 |  |
Revolving Loans Amortized Cost Basis | 3,475 |  | 3,475 |  |
Revolving Loans converted to term loans | 443 |  | 443 |  |
Total Loans | 47,084 |  | 47,084 |  | 25,700
Increase in amortized cost | 21,400 |  | 21,400 |  |
Doubtful |  |  |  |  |
Revolving Loans Amortized Cost Basis | 3,929 |  | 3,929 |  |
Total Loans | 3,929 |  | 3,929 |  |
One-To-Four Family - Residential Portfolio Segment [Member] |  |  |  |  |
2023 | 5,108 |  | 5,108 |  |
2022 | 23,829 |  | 23,829 |  |
2021 | 8,780 |  | 8,780 |  |
2020 | 16,857 |  | 16,857 |  |
2019 | 38,893 |  | 38,893 |  |
Prior | 110,972 |  | 110,972 |  |
Revolving Loans Amortized Cost Basis | 7,475 |  | 7,475 |  |
Revolving Loans converted to term loans | 12,213 |  | 12,213 |  |
Total Loans | 224,127 |  | 224,127 |  | 242,480
Gross charge-offs |  |  |  |  |
Prior |  |  | 12 |  |
Charge-offs |  | $ 2 | 12 | 2 |
One-To-Four Family - Residential Portfolio Segment [Member] | Pass |  |  |  |  |
2023 | 5,108 |  | 5,108 |  |
2022 | 23,319 |  | 23,319 |  |
2021 | 8,506 |  | 8,506 |  |
2020 | 16,857 |  | 16,857 |  |
2019 | 38,153 |  | 38,153 |  |
Prior | 104,508 |  | 104,508 |  |
Revolving Loans Amortized Cost Basis | 7,475 |  | 7,475 |  |
Revolving Loans converted to term loans | 10,252 |  | 10,252 |  |
Total Loans | 214,178 |  | 214,178 |  |
One-To-Four Family - Residential Portfolio Segment [Member] | Watch |  |  |  |  |
2022 | 510 |  | 510 |  |
2021 | 274 |  | 274 |  |
2019 | 740 |  | 740 |  |
Prior | 1,527 |  | 1,527 |  |
Revolving Loans converted to term loans | 1,321 |  | 1,321 |  |
Total Loans | 4,372 |  | 4,372 |  |
One-To-Four Family - Residential Portfolio Segment [Member] | Special Mention |  |  |  |  |
Prior | 204 |  | 204 |  |
Revolving Loans converted to term loans | 197 |  | 197 |  |
Total Loans | 401 |  | 401 |  |
One-To-Four Family - Residential Portfolio Segment [Member] | Substandard |  |  |  |  |
Prior | 4,733 |  | 4,733 |  |
Revolving Loans converted to term loans | 443 |  | 443 |  |
Total Loans | 5,176 |  | 5,176 |  |
One-To-Four Family - Mixed-Use Property Portfolio Segment [Member] |  |  |  |  |
2023 | 18,557 |  | 18,557 |  |
2022 | 43,937 |  | 43,937 |  |
2021 | 41,987 |  | 41,987 |  |
2020 | 31,274 |  | 31,274 |  |
2019 | 61,994 |  | 61,994 |  |
Prior | 342,770 |  | 342,770 |  |
Total Loans | 540,519 |  | 540,519 |  | 557,295
One-To-Four Family - Mixed-Use Property Portfolio Segment [Member] | Pass |  |  |  |  |
2023 | 18,557 |  | 18,557 |  |
2022 | 43,937 |  | 43,937 |  |
2021 | 41,987 |  | 41,987 |  |
2020 | 31,274 |  | 31,274 |  |
2019 | 61,270 |  | 61,270 |  |
Prior | 335,314 |  | 335,314 |  |
Total Loans | 532,339 |  | 532,339 |  |
One-To-Four Family - Mixed-Use Property Portfolio Segment [Member] | Watch |  |  |  |  |
2019 | 724 |  | 724 |  |
Prior | 5,564 |  | 5,564 |  |
Total Loans | 6,288 |  | 6,288 |  |
One-To-Four Family - Mixed-Use Property Portfolio Segment [Member] | Special Mention |  |  |  |  |
Prior | 636 |  | 636 |  |
Total Loans | 636 |  | 636 |  |
One-To-Four Family - Mixed-Use Property Portfolio Segment [Member] | Substandard |  |  |  |  |
Prior | 1,256 |  | 1,256 |  |
Total Loans | 1,256 |  | 1,256 |  |
Commercial Real Estate [Member] |  |  |  |  |
2023 | 134,977 |  | 134,977 |  |
2022 | 326,545 |  | 326,545 |  |
2021 | 179,303 |  | 179,303 |  |
2020 | 148,835 |  | 148,835 |  |
2019 | 228,028 |  | 228,028 |  |
Prior | 936,774 |  | 936,774 |  |
Total Loans | 1,954,462 |  | 1,954,462 |  | 1,914,898
Gross charge-offs |  |  |  |  |
Prior |  |  | 8 |  |
Charge-offs |  |  | 8 |  |
Commercial Real Estate [Member] | Pass |  |  |  |  |
2023 | 134,977 |  | 134,977 |  |
2022 | 326,545 |  | 326,545 |  |
2021 | 177,860 |  | 177,860 |  |
2020 | 148,835 |  | 148,835 |  |
2019 | 218,458 |  | 218,458 |  |
Prior | 913,106 |  | 913,106 |  |
Total Loans | 1,919,781 |  | 1,919,781 |  |
Commercial Real Estate [Member] | Watch |  |  |  |  |
2021 | 1,443 |  | 1,443 |  |
2019 | 9,570 |  | 9,570 |  |
Prior | 23,668 |  | 23,668 |  |
Total Loans | 34,681 |  | 34,681 |  |
Construction Portfolio Segment |  |  |  |  |
2023 | 5,520 |  | 5,520 |  |
2022 | 3 |  | 3 |  |
2021 | 5,793 |  | 5,793 |  |
Revolving Loans Amortized Cost Basis | 48,459 |  | 48,459 |  |
Total Loans | 59,775 |  | 59,775 |  | 70,824
Construction Portfolio Segment | Pass |  |  |  |  |
2023 | 5,520 |  | 5,520 |  |
2022 | 3 |  | 3 |  |
2021 | 5,793 |  | 5,793 |  |
Revolving Loans Amortized Cost Basis | 48,459 |  | 48,459 |  |
Total Loans | 59,775 |  | 59,775 |  |
Multi-family Residential Portfolio Segment [Member] |  |  |  |  |
2023 | 171,298 |  | 171,298 |  |
2022 | 469,760 |  | 469,760 |  |
2021 | 279,408 |  | 279,408 |  |
2020 | 219,445 |  | 219,445 |  |
2019 | 306,987 |  | 306,987 |  |
Prior | 1,166,656 |  | 1,166,656 |  |
Revolving Loans Amortized Cost Basis | 4,075 |  | 4,075 |  |
Total Loans | 2,617,629 |  | 2,617,629 |  | 2,605,172
Multi-family Residential Portfolio Segment [Member] | Pass |  |  |  |  |
2023 | 171,298 |  | 171,298 |  |
2022 | 468,879 |  | 468,879 |  |
2021 | 279,408 |  | 279,408 |  |
2020 | 217,501 |  | 217,501 |  |
2019 | 306,987 |  | 306,987 |  |
Prior | 1,127,156 |  | 1,127,156 |  |
Revolving Loans Amortized Cost Basis | 4,075 |  | 4,075 |  |
Total Loans | 2,575,304 |  | 2,575,304 |  |
Multi-family Residential Portfolio Segment [Member] | Watch |  |  |  |  |
2022 | 881 |  | 881 |  |
2020 | 1,944 |  | 1,944 |  |
Prior | 32,691 |  | 32,691 |  |
Total Loans | 35,516 |  | 35,516 |  |
Multi-family Residential Portfolio Segment [Member] | Special Mention |  |  |  |  |
Prior | 1,461 |  | 1,461 |  |
Total Loans | 1,461 |  | 1,461 |  |
Multi-family Residential Portfolio Segment [Member] | Substandard |  |  |  |  |
Prior | 5,348 |  | 5,348 |  |
Total Loans | 5,348 |  | 5,348 |  |
Commercial Business Secured By Portfolio Segment [member] |  |  |  |  |
2023 | 45,361 |  | 45,361 |  |
2022 | 178,373 |  | 178,373 |  |
2021 | 131,700 |  | 131,700 |  |
2020 | 106,902 |  | 106,902 |  |
2019 | 55,114 |  | 55,114 |  |
Prior | 196,701 |  | 196,701 |  |
Total Loans | 714,151 |  | 714,151 |  |
Commercial Business Secured By Portfolio Segment [member] | Pass |  |  |  |  |
2023 | 35,585 |  | 35,585 |  |
2022 | 178,373 |  | 178,373 |  |
2021 | 131,700 |  | 131,700 |  |
2020 | 106,902 |  | 106,902 |  |
2019 | 40,114 |  | 40,114 |  |
Prior | 143,676 |  | 143,676 |  |
Total Loans | 636,350 |  | 636,350 |  |
Commercial Business Secured By Portfolio Segment [member] | Watch |  |  |  |  |
2023 | 9,776 |  | 9,776 |  |
2019 | 597 |  | 597 |  |
Prior | 53,025 |  | 53,025 |  |
Total Loans | 63,398 |  | 63,398 |  |
Commercial Business Secured By Portfolio Segment [member] | Special Mention |  |  |  |  |
2019 | 14,403 |  | 14,403 |  |
Total Loans | 14,403 |  | 14,403 |  |
Commercial Business Portfolio Segment [Member] |  |  |  |  |
2023 | 79,738 |  | 79,738 |  |
2022 | 132,908 |  | 132,908 |  |
2021 | 85,079 |  | 85,079 |  |
2020 | 36,419 |  | 36,419 |  |
2019 | 46,806 |  | 46,806 |  |
Prior | 95,043 |  | 95,043 |  |
Revolving Loans Amortized Cost Basis | 297,916 |  | 297,916 |  |
Total Loans | 773,909 |  | 773,909 |  |
Gross charge-offs |  |  |  |  |
2021 |  |  | 1,675 |  |
2019 |  |  | 14 |  |
Prior |  |  | 11 |  |
Revolving Loans Amortized Cost Basis |  |  | 9,267 |  |
Charge-offs |  |  | 10,967 |  |
Commercial Business Portfolio Segment [Member] | Pass |  |  |  |  |
2023 | 64,537 |  | 64,537 |  |
2022 | 124,017 |  | 124,017 |  |
2021 | 77,139 |  | 77,139 |  |
2020 | 33,986 |  | 33,986 |  |
2019 | 32,087 |  | 32,087 |  |
Prior | 62,001 |  | 62,001 |  |
Revolving Loans Amortized Cost Basis | 285,765 |  | 285,765 |  |
Total Loans | 679,532 |  | 679,532 |  |
Commercial Business Portfolio Segment [Member] | Watch |  |  |  |  |
2023 | 266 |  | 266 |  |
2022 | 6,437 |  | 6,437 |  |
2021 | 4,015 |  | 4,015 |  |
2020 | 2,433 |  | 2,433 |  |
2019 | 14,664 |  | 14,664 |  |
Prior | 20,105 |  | 20,105 |  |
Revolving Loans Amortized Cost Basis | 2,747 |  | 2,747 |  |
Total Loans | 50,667 |  | 50,667 |  |
Commercial Business Portfolio Segment [Member] | Special Mention |  |  |  |  |
2021 | 3,925 |  | 3,925 |  |
2019 | 27 |  | 27 |  |
Revolving Loans Amortized Cost Basis | 2,000 |  | 2,000 |  |
Total Loans | 5,952 |  | 5,952 |  |
Commercial Business Portfolio Segment [Member] | Substandard |  |  |  |  |
2023 | 14,935 |  | 14,935 |  |
2022 | 2,454 |  | 2,454 |  |
2019 | 28 |  | 28 |  |
Prior | 12,937 |  | 12,937 |  |
Revolving Loans Amortized Cost Basis | 3,475 |  | 3,475 |  |
Total Loans | 33,829 |  | 33,829 |  |
Commercial Business Portfolio Segment [Member] | Doubtful |  |  |  |  |
Revolving Loans Amortized Cost Basis | 3,929 |  | 3,929 |  |
Total Loans | 3,929 |  | 3,929 |  |
Small Business Administration Portfolio Segment [Member] |  |  |  |  |
2023 | 806 |  | 806 |  |
2022 | 3,301 |  | 3,301 |  |
2021 | 4,978 |  | 4,978 |  |
2020 | 3,613 |  | 3,613 |  |
2019 | 750 |  | 750 |  |
Prior | 8,388 |  | 8,388 |  |
Total Loans | 21,836 |  | 21,836 |  | 23,193
Gross charge-offs |  |  |  |  |
Prior |  |  | 7 |  |
Charge-offs |  |  | 7 | $ 1,054 |
Small Business Administration Portfolio Segment [Member] | Pass |  |  |  |  |
2023 | 806 |  | 806 |  |
2022 | 3,301 |  | 3,301 |  |
2021 | 3,166 |  | 3,166 |  |
2020 | 3,613 |  | 3,613 |  |
2019 | 702 |  | 702 |  |
Prior | 4,006 |  | 4,006 |  |
Total Loans | 15,594 |  | 15,594 |  |
Small Business Administration Portfolio Segment [Member] | Watch |  |  |  |  |
2019 | 48 |  | 48 |  |
Prior | 2,876 |  | 2,876 |  |
Total Loans | 2,924 |  | 2,924 |  |
Small Business Administration Portfolio Segment [Member] | Special Mention |  |  |  |  |
2021 | 1,494 |  | 1,494 |  |
Prior | 349 |  | 349 |  |
Total Loans | 1,843 |  | 1,843 |  |
Small Business Administration Portfolio Segment [Member] | Substandard |  |  |  |  |
2021 | 318 |  | 318 |  |
Prior | 1,157 |  | 1,157 |  |
Total Loans | 1,475 |  | 1,475 |  |
Other Portfolio Segment [Member] |  |  |  |  |
Prior | 180 |  | 180 |  |
Revolving Loans Amortized Cost Basis | 125 |  | 125 |  |
Total Loans | 305 |  | 305 |  |
Gross charge-offs |  |  |  |  |
Prior |  |  | 56 |  |
Charge-offs |  |  | 56 |  |
Other Portfolio Segment [Member] | Pass |  |  |  |  |
Prior | 180 |  | 180 |  |
Revolving Loans Amortized Cost Basis | 125 |  | 125 |  |
Total Loans | 305 |  | 305 |  |
Consumer Portfolio Segment [Member] |  |  |  |  |
Mortgage loans in process of foreclosure, amount | $ 4,700 |  | $ 4,700 |  | $ 5,200

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