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Investments - Carrying value and estimated fair value (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Apr. 01, 2022
Dec. 31, 2021
Schedule of Available-for-sale Securities      
Debt securities, amortized cost $ 772,677   $ 1,098,373
Gross Unrealized Gains 168   20,373
Gross Unrealized Losses (104,545)   (9,538)
Available-for-sale debt securities 668,300   1,109,208
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date 305,482   0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 25    
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (38,064) $ (25,300)  
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value 267,443    
U.S. Government agencies      
Schedule of Available-for-sale Securities      
Debt securities, amortized cost 344   373
Gross Unrealized Gains 0   6
Gross Unrealized Losses (11)   0
Available-for-sale debt securities 333   379
U.S. Treasury securities      
Schedule of Available-for-sale Securities      
Debt securities, amortized cost 9,989   9,988
Gross Unrealized Gains 0   0
Gross Unrealized Losses (1,441)   (63)
Available-for-sale debt securities 8,548   9,925
Obligations of states and political subdivisions      
Schedule of Available-for-sale Securities      
Debt securities, amortized cost 219,720   512,952
Gross Unrealized Gains 28   16,703
Gross Unrealized Losses (37,150)   (3,188)
Available-for-sale debt securities 182,598   526,467
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date 191,975    
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 25    
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (28,121)    
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value 163,879    
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations      
Schedule of Available-for-sale Securities      
Debt securities, amortized cost 123,093   213,471
Gross Unrealized Gains 3   2,245
Gross Unrealized Losses (7,756)   (1,277)
Available-for-sale debt securities 115,340   214,439
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date 10,350    
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0    
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (1,317)    
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value 9,033    
Private label mortgage and asset backed securities      
Schedule of Available-for-sale Securities      
Debt securities, amortized cost 419,531   317,089
Gross Unrealized Gains 137   824
Gross Unrealized Losses (58,187)   (4,693)
Available-for-sale debt securities 361,481   313,220
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date 57,201    
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0    
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (6,033)    
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value 51,168    
Corporate debt securities      
Schedule of Available-for-sale Securities      
Debt securities, amortized cost     44,500
Gross Unrealized Gains     595
Gross Unrealized Losses     (317)
Available-for-sale debt securities     $ 44,778
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date 45,956    
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0    
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (2,593)    
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value $ 43,363