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Investments - Investments by contractual maturity (Details) - USD ($) $ in Thousands | Jun. 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 | 31,319 | 15,661
After one year through five years, estimated fair value | 28,519 | 14,056
After five years through ten years, amortized cost | 22,949 | 33,585
After five years through ten years, estimated fair value | 21,002 | 29,670
After ten years, amortized cost | 137,732 | 144,514
After ten years, estimated fair value | 119,562 | 129,972
Total allocated, amortized cost | 192,000 | 193,760
Total allocated, estimated fair value | 169,083 | 173,698
Amortized Cost | 523,679 | 536,334
Available-for-sale debt securities | 469,354 | 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 | 26,425 | 24,535
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five | 25,777 | 23,368
Debt Securities, Held-to-maturity, Maturity, Rolling after Five Through Ten Years, Weighted Average Yield | 58,774 | 60,369
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 | 54,801 | 54,685
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year 10 | 107,003 | 107,252
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 | 91,506 | 96,765
Held-to-maturity investment securities | 192,202 | 192,156
Debt Securities, Held-to-Maturity, Maturity, Allocated and Single Maturity Date, Fair Value | 172,084 | 174,818
Amortized Cost | 292,191 | 302,515
Held-to-maturity investment securities | 263,683 | 274,568
U.S. Government agencies |  |
Schedule of Available-for-sale Securities |  |
Investment securities not due at a single maturity date, amortized cost | 68 | 70
Investment securities not due at a single maturity date, estimated fair value | 65 | 65
Amortized Cost | 68 | 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 | 77,969 | 76,732
Investment securities not due at a single maturity date, estimated fair value | 73,994 | 72,302
Amortized Cost | 77,969 | 76,732
Available-for-sale debt securities | 73,994 | 72,302
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date | 11,268 | 11,095
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value | 9,491 | 8,995
Amortized Cost | 11,268 | 11,095
Held-to-maturity investment securities | 9,491 | 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 | 253,182 | 265,302
Investment securities not due at a single maturity date, estimated fair value | 225,729 | 230,555
Amortized Cost | 253,182 | 265,302
Available-for-sale debt securities | 225,729 | 230,555
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date | 52,400 | 53,066
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value | 48,139 | 47,433
Amortized Cost | 52,400 | 53,066
Held-to-maturity investment securities | 48,139 | 47,433
Corporate debt securities |  |
Schedule of Available-for-sale Securities |  |
Investment securities not due at a single maturity date, amortized cost | 460 | 470
Investment securities not due at a single maturity date, estimated fair value | 483 | 493
Amortized Cost | 460 | 470
Available-for-sale debt securities | 483 | 493
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date | 36,321 | 46,198
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value | 33,969 | 43,322
Amortized Cost | 36,321 | 46,198
Held-to-maturity investment securities | $ 33,970 | $ 43,322

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