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Investments - Carrying value and estimated fair value (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Jan. 01, 2023
Dec. 31, 2022
Schedule of Available-for-sale Securities      
Debt securities, amortized cost $ 704,993   $ 740,468
Gross Unrealized Gains 12   18
Gross Unrealized Losses (85,246)   (91,661)
Debt Securities, Available-for-sale 619,759   648,825
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, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date 303,876   305,107
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 76   67
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (30,560)   (33,925)
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value 273,848   271,249
Debt Securities, Available-for-sale, Allowance for Credit Loss 0    
Held-to-maturity investment securities 273,848    
Debt Securities, Held-to-maturity, Allowance for Credit Loss (456)    
U.S. Government agencies      
Schedule of Available-for-sale Securities      
Debt securities, amortized cost 105   107
Gross Unrealized Gains 0   0
Gross Unrealized Losses (9)   (9)
Debt Securities, Available-for-sale 96   98
Debt Securities, Available-for-sale, Allowance for Credit Loss 0    
U.S. Treasury securities      
Schedule of Available-for-sale Securities      
Debt securities, amortized cost 9,989   9,990
Gross Unrealized Gains 0   0
Gross Unrealized Losses (1,209)   (1,283)
Debt Securities, Available-for-sale 8,780   8,707
Debt Securities, Available-for-sale, Allowance for Credit Loss 0    
Obligations of states and political subdivisions      
Schedule of Available-for-sale Securities      
Debt securities, amortized cost 199,818   201,638
Gross Unrealized Gains 0   0
Gross Unrealized Losses (22,392)   (26,653)
Debt Securities, Available-for-sale 177,426   174,985
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date 192,034    
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date     192,004
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 76   67
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (17,108)   (23,166)
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value     168,905
Debt Securities, Available-for-sale, Allowance for Credit Loss 0    
Held-to-maturity investment securities 175,002    
Debt Securities, Held-to-maturity, Allowance for Credit Loss (17)    
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations      
Schedule of Available-for-sale Securities      
Debt securities, amortized cost 96,072   117,292
Gross Unrealized Gains 2   4
Gross Unrealized Losses (6,857)   (7,803)
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, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date     10,430
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0   0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (1,728)   (1,762)
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value 8,864   8,668
Debt Securities, Available-for-sale, Allowance for Credit Loss 0    
Held-to-maturity investment securities 8,864    
Debt Securities, Held-to-maturity, Allowance for Credit Loss 0    
Private label mortgage and asset backed securities      
Schedule of Available-for-sale Securities      
Debt securities, amortized cost 399,009   411,441
Gross Unrealized Gains 10   14
Gross Unrealized Losses (54,779)   (55,913)
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, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date     56,691
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0   0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (6,484)   (5,931)
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value 49,189   50,760
Debt Securities, Available-for-sale, Allowance for Credit Loss 0    
Held-to-maturity investment securities 49,189    
Debt Securities, Held-to-maturity, Allowance for Credit Loss (1) $ (231)  
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, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date     45,982
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0   0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (5,240)   (3,066)
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value 40,793   $ 42,916
Held-to-maturity investment securities 40,793    
Debt Securities, Held-to-maturity, Allowance for Credit Loss $ (438) $ (545)