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Investments - Investments by contractual maturity (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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Schedule of Available-for-sale Securities |  |
Within one year, amortized cost | $ 0 | $ 0
Within one year, estimated fair value | 0 | 0
After one year through five years, amortized cost | 31,314 | 15,661
After one year through five years, estimated fair value | 28,931 | 14,056
After five years through ten years, amortized cost | 22,660 | 33,585
After five years through ten years, estimated fair value | 21,325 | 29,670
After ten years, amortized cost | 137,116 | 144,514
After ten years, estimated fair value | 123,586 | 129,972
Total allocated, amortized cost | 191,090 | 193,760
Total allocated, estimated fair value | 173,842 | 173,698
Amortized Cost | 515,813 | 536,334
Available-for-sale debt securities | 473,075 | 477,113
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Fair Value | 0 | 0
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, Year One | 0 | 0
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year One through Five | 29,153 | 24,535
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five | 28,659 | 23,368
Debt Securities, Held-to-maturity, Maturity, Rolling after Five Through Ten Years, Weighted Average Yield | 63,796 | 60,369
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 | 60,326 | 54,685
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year 10 | 99,323 | 107,252
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 | 88,524 | 96,765
Held-to-maturity investment securities | 192,272 | 192,156
Debt Securities, Held-to-Maturity, Maturity, Allocated and Single Maturity Date, Fair Value | 177,509 | 174,818
Amortized Cost | 287,806 | 302,515
Held-to-maturity investment securities | 266,706 | 274,568
U.S. Government agencies |  |
Schedule of Available-for-sale Securities |  |
Investment securities not due at a single maturity date, amortized cost | 67 | 70
Investment securities not due at a single maturity date, estimated fair value | 65 | 65
Amortized Cost | 67 | 70
Available-for-sale debt securities | 65 | 65
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations |  |
Schedule of Available-for-sale Securities |  |
Investment securities not due at a single maturity date, amortized cost | 69,795 | 76,732
Investment securities not due at a single maturity date, estimated fair value | 66,662 | 72,302
Amortized Cost | 69,795 | 76,732
Available-for-sale debt securities | 66,662 | 72,302
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date | 11,355 | 11,095
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value | 9,724 | 8,995
Amortized Cost | 11,355 | 11,095
Held-to-maturity investment securities | 9,724 | 8,995
Private label mortgage and asset backed securities |  |
Schedule of Available-for-sale Securities |  |
Investment securities not due at a single maturity date, amortized cost | 254,400 | 265,302
Investment securities not due at a single maturity date, estimated fair value | 232,012 | 230,555
Amortized Cost | 254,400 | 265,302
Available-for-sale debt securities | 232,012 | 230,555
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date | 51,813 | 53,066
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value | 48,615 | 47,433
Amortized Cost | 51,813 | 53,066
Held-to-maturity investment securities | 48,615 | 47,433
Corporate debt securities |  |
Schedule of Available-for-sale Securities |  |
Investment securities not due at a single maturity date, amortized cost | 461 | 470
Investment securities not due at a single maturity date, estimated fair value | 494 | 493
Amortized Cost | 461 | 470
Available-for-sale debt securities | 494 | 493
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date | 32,366 | 46,198
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value | 30,858 | 43,322
Amortized Cost | 32,366 | 46,198
Held-to-maturity investment securities | $ 30,858 | $ 43,322

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