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Investments - Investments by contractual maturity (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
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