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Investments - Carrying value and estimated fair value (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Schedule of Available-for-sale Securities    
Debt securities, amortized cost $ 643,525 $ 669,646
Gross Unrealized Gains 11 13
Gross Unrealized Losses (70,002) (72,463)
Debt Securities, Available-for-sale 573,534 597,196
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date 303,406 303,493
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date 302,512 302,442
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 70 70
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (28,583) (26,560)
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value 274,893 277,003
Debt Securities, Available-for-sale, Allowance for Credit Loss 0 0
Held-to-maturity investment securities 274,893 277,003
Debt Securities, Held-to-maturity, Allowance for Credit Loss (894) (1,051)
U.S. Government agencies    
Schedule of Available-for-sale Securities    
Debt securities, amortized cost 100 102
Gross Unrealized Gains 0 0
Gross Unrealized Losses (8) (7)
Debt Securities, Available-for-sale 92 95
Debt Securities, Available-for-sale, Allowance for Credit Loss 0 0
U.S. Treasury securities    
Schedule of Available-for-sale Securities    
Debt securities, amortized cost 9,990 9,990
Gross Unrealized Gains 0 0
Gross Unrealized Losses (1,112) (1,036)
Debt Securities, Available-for-sale 8,878 8,954
Debt Securities, Available-for-sale, Allowance for Credit Loss 0 0
Obligations of states and political subdivisions    
Schedule of Available-for-sale Securities    
Debt securities, amortized cost 197,311 198,070
Gross Unrealized Gains 0 0
Gross Unrealized Losses (18,906) (17,848)
Debt Securities, Available-for-sale 178,405 180,222
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date 192,099 192,070
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 70 70
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (15,964) (14,188)
Debt Securities, Available-for-sale, Allowance for Credit Loss 0 0
Held-to-maturity investment securities 176,205 177,952
Debt Securities, Held-to-maturity, Allowance for Credit Loss (14) (20)
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations    
Schedule of Available-for-sale Securities    
Debt securities, amortized cost 86,205 88,874
Gross Unrealized Gains 4 3
Gross Unrealized Losses (5,411) (5,525)
Debt Securities, Available-for-sale 80,798 83,352
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date 10,841 10,758
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (2,010) (1,692)
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value 8,831 9,066
Debt Securities, Available-for-sale, Allowance for Credit Loss 0 0
Held-to-maturity investment securities 8,831 9,066
Debt Securities, Held-to-maturity, Allowance for Credit Loss 0 0
Private label mortgage and asset backed securities    
Schedule of Available-for-sale Securities    
Debt securities, amortized cost 349,919 372,610
Gross Unrealized Gains 7 10
Gross Unrealized Losses (44,565) (48,047)
Debt Securities, Available-for-sale 305,361 324,573
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date 54,354 54,579
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (5,738) (5,944)
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value 48,616 48,635
Debt Securities, Available-for-sale, Allowance for Credit Loss 0 0
Held-to-maturity investment securities 48,616 48,635
Debt Securities, Held-to-maturity, Allowance for Credit Loss (11) (11)
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 46,112 46,086
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (4,871) (4,736)
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value 41,241 41,350
Held-to-maturity investment securities 41,241 41,350
Debt Securities, Held-to-maturity, Allowance for Credit Loss $ (869) $ (1,020)