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Investments - Investments by contractual maturity (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
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 9,991 0
After one year through five years, estimated fair value 8,780 0
After five years through ten years, amortized cost 35,405 45,918
After five years through ten years, estimated fair value 30,127 38,383
After ten years, amortized cost 164,411 165,710
After ten years, estimated fair value 147,300 145,309
Total securities with single maturity date, amortized cost 209,807 211,628
Total securities with single maturity date, estimated fair value 186,207 183,692
Debt securities, amortized cost 704,993 740,468
Debt Securities, Available-for-sale 619,759 648,825
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, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five 130 129
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year One through Five 134 132
Debt Securities, Held-to-maturity, Maturity, Rolling after Five Through Ten Years, Weighted Average Yield 75,683 51,424
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 68,920 46,143
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 105,952 122,633
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year 10 116,217 140,448
Held-to-maturity investment securities 192,034 192,004
Held-to-maturity debt securities, at amortized cost less allowance for credit losses of $456 at June 30, 2023 and $- at December 31, 2022 175,002 168,905
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date 304,332 305,107
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value 273,848 271,249
U.S. Government agencies    
Schedule of Available-for-sale Securities    
Investment securities not due at a single maturity date, amortized cost 105 107
Investment securities not due at a single maturity date, estimated fair value 96 98
Debt securities, amortized cost 105 107
Debt Securities, Available-for-sale 96 98
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 96,072 117,292
Investment securities not due at a single maturity date, estimated fair value 89,217 109,493
Debt securities, amortized cost 96,072 117,292
Debt Securities, Available-for-sale 89,217 109,493
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date 10,592 10,430
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value 8,864 8,668
Private label mortgage and asset backed securities    
Schedule of Available-for-sale Securities    
Investment securities not due at a single maturity date, amortized cost 399,009 411,441
Investment securities not due at a single maturity date, estimated fair value 344,239 355,542
Debt securities, amortized cost 399,009 411,441
Debt Securities, Available-for-sale 344,240 355,542
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date 55,673 56,691
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value 49,189 50,760
Corporate debt securities    
Schedule of Available-for-sale Securities    
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date 46,033 45,982
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value $ 40,793 $ 42,916