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Investments - Carrying value and estimated fair value (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Mar. 31, 2024
Dec. 31, 2023
Schedule of Available-for-sale Securities        
Debt securities, amortized cost $ 525,499 $ 536,334    
Gross Unrealized Gains 46 37    
Gross Unrealized Losses (56,512) (59,258)    
Available-for-sale debt securities: 469,033 477,113    
Available-for-sale debt securities, allowance for credit losses 0 0    
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date 302,134 302,515    
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 54 54    
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (28,074) (28,001)    
Held-to-maturity investment securities 274,114 274,568    
Held-to-maturity debt securities, allowance for credit losses 974 1,156 $ 894 $ 1,051
U.S. Government agencies        
Schedule of Available-for-sale Securities        
Debt securities, amortized cost 69 70    
Gross Unrealized Gains 0 0    
Gross Unrealized Losses (3) (5)    
Available-for-sale debt securities: 66 65    
Available-for-sale debt securities, allowance for credit losses 0 0    
U.S. Treasury securities        
Schedule of Available-for-sale Securities        
Debt securities, amortized cost 9,994 9,994    
Gross Unrealized Gains 0 0    
Gross Unrealized Losses (770) (936)    
Available-for-sale debt securities: 9,224 9,058    
Available-for-sale debt securities, allowance for credit losses 0 0    
Obligations of states and political subdivisions        
Schedule of Available-for-sale Securities        
Debt securities, amortized cost 183,031 183,766    
Gross Unrealized Gains 0 0    
Gross Unrealized Losses (20,796) (19,126)    
Available-for-sale debt securities: 162,235 164,640    
Available-for-sale debt securities, allowance for credit losses 0 0    
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date 192,187 192,156    
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 54 54    
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (18,894) (17,392)    
Held-to-maturity investment securities 173,347 174,818    
Held-to-maturity debt securities, allowance for credit losses 12 12    
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations        
Schedule of Available-for-sale Securities        
Debt securities, amortized cost 74,625 76,732    
Gross Unrealized Gains 11 8    
Gross Unrealized Losses (4,042) (4,438)    
Available-for-sale debt securities: 70,594 72,302    
Available-for-sale debt securities, allowance for credit losses 0 0    
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date 11,181 11,095    
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0 0    
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (1,874) (2,100)    
Held-to-maturity investment securities 9,307 8,995    
Held-to-maturity debt securities, allowance for credit losses 0 0    
Private label mortgage and asset backed securities        
Schedule of Available-for-sale Securities        
Debt securities, amortized cost 257,322 265,302    
Gross Unrealized Gains 6 6    
Gross Unrealized Losses (30,901) (34,753)    
Available-for-sale debt securities: 226,427 230,555    
Available-for-sale debt securities, allowance for credit losses 0 0    
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date 52,540 53,066    
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0 0    
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (4,776) (5,633)    
Held-to-maturity investment securities 47,764 47,433    
Held-to-maturity debt securities, allowance for credit losses 7 8    
Corporate debt securities        
Schedule of Available-for-sale Securities        
Debt securities, amortized cost 458 470    
Gross Unrealized Gains 29 23    
Gross Unrealized Losses 0 0    
Available-for-sale debt securities: 487 493    
Available-for-sale debt securities, allowance for credit losses 0      
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date 46,226 46,198    
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0 0    
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (2,530) (2,876)    
Held-to-maturity investment securities 43,696 43,322    
Held-to-maturity debt securities, allowance for credit losses $ 955 $ 1,136