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Investments - Carrying value and estimated fair value (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Jan. 01, 2023
Dec. 31, 2022
Schedule of Available-for-sale Securities      
Debt securities, amortized cost $ 694,732   $ 740,468
Gross Unrealized Gains 8   18
Gross Unrealized Losses (101,310)   (91,661)
Debt Securities, Available-for-sale 593,430   648,825
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, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date 303,451   305,107
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 75   67
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (43,784)   (33,925)
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value 260,023   271,249
Debt Securities, Available-for-sale, Allowance for Credit Loss 0    
Held-to-maturity investment securities 260,023    
Debt Securities, Held-to-maturity, Allowance for Credit Loss (281)    
U.S. Government agencies      
Schedule of Available-for-sale Securities      
Debt securities, amortized cost 103   107
Gross Unrealized Gains 0   0
Gross Unrealized Losses (11)   (9)
Debt Securities, Available-for-sale 92   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 (1,373)   (1,283)
Debt Securities, Available-for-sale 8,616   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 198,823   201,638
Gross Unrealized Gains 0   0
Gross Unrealized Losses (32,698)   (26,653)
Debt Securities, Available-for-sale 166,125   174,985
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date 192,056    
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 75   67
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (27,959)   (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 164,172    
Debt Securities, Held-to-maturity, Allowance for Credit Loss (15)    
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations      
Schedule of Available-for-sale Securities      
Debt securities, amortized cost 93,303   117,292
Gross Unrealized Gains 1   4
Gross Unrealized Losses (7,358)   (7,803)
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, 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 (2,379)   (1,762)
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value 8,296   8,668
Debt Securities, Available-for-sale, Allowance for Credit Loss 0    
Held-to-maturity investment securities 8,296    
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 392,514   411,441
Gross Unrealized Gains 7   14
Gross Unrealized Losses (59,870)   (55,913)
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, 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 (8,103)   (5,931)
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value 46,840   50,760
Debt Securities, Available-for-sale, Allowance for Credit Loss 0    
Held-to-maturity investment securities 46,840    
Debt Securities, Held-to-maturity, Allowance for Credit Loss (12) $ (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 46,058   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 (5,343)   (3,066)
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value 40,715   $ 42,916
Held-to-maturity investment securities 40,715    
Debt Securities, Held-to-maturity, Allowance for Credit Loss $ (254) $ (545)