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Investments - Investments by contractual maturity (Details) - USD ($)
$ in Thousands
Sep. 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 8,618 0
After five years through ten years, amortized cost 35,063 45,918
After five years through ten years, estimated fair value 28,981 38,383
After ten years, amortized cost 163,756 165,710
After ten years, estimated fair value 137,142 145,309
Total securities with single maturity date, amortized cost 208,810 211,628
Total securities with single maturity date, estimated fair value 174,741 183,692
Debt securities, amortized cost 694,732 740,468
Debt Securities, Available-for-sale 593,430 648,825
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 5,343 129
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year One through Five 5,968 132
Debt Securities, Held-to-maturity, Maturity, Rolling after Five Through Ten Years, Weighted Average Yield 75,645 51,424
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 66,265 46,143
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 92,564 122,633
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year 10 110,443 140,448
Held-to-maturity investment securities 192,056 192,004
Held-to-maturity debt securities, at amortized cost less allowance for credit losses of $281 at September 30, 2023 and $0 at December 31, 2022 164,172 168,905
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date 303,732 305,107
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value 260,023 271,249
U.S. Government agencies    
Schedule of Available-for-sale Securities    
Investment securities not due at a single maturity date, amortized cost 103 107
Investment securities not due at a single maturity date, estimated fair value 92 98
Debt securities, amortized cost 103 107
Debt Securities, Available-for-sale 92 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 93,303 117,292
Investment securities not due at a single maturity date, estimated fair value 85,946 109,493
Debt securities, amortized cost 93,303 117,292
Debt Securities, Available-for-sale 85,946 109,493
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date 10,675 10,430
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value 8,296 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 392,516 411,441
Investment securities not due at a single maturity date, estimated fair value 332,651 355,542
Debt securities, amortized cost 392,514 411,441
Debt Securities, Available-for-sale 332,651 355,542
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date 54,943 56,691
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value 46,840 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 46,058 45,982
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value $ 40,715 $ 42,916