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Investments - Unrealized losses (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value $ 434,818 $ 496,816
Less than 12 Months, Unrealized Losses (62,347) (7,842)
12 Months or More, Fair Value 233,482 75,609
12 Months or More, Unrealized Losses (42,198) (1,696)
Total Fair Value 668,300 572,425
Total Unrealized Losses (104,545) (9,538)
Held-to-Maturity Securities, Less than 12 Months, Fair Value 150,190  
Held-to-Maturity Securities, Less than 12 Months, Unrealized Losses (21,556)  
Held-to-Maturity Securities, More than 12 Months, Fair Value 117,253  
Held-to-Maturity Securities, More than 12 Months, Unrealized Losses (16,508)  
Held-to-Maturity Securities, Fair Value 267,443  
Held-to-Maturity Securities, Unrealized Losses (38,064)  
U.S. Government agencies    
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value 333  
Less than 12 Months, Unrealized Losses (11)  
12 Months or More, Fair Value 0  
12 Months or More, Unrealized Losses 0  
Total Fair Value 333  
Total Unrealized Losses (11)  
Obligations of states and political subdivisions    
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value 165,535 143,336
Less than 12 Months, Unrealized Losses (32,830) (2,896)
12 Months or More, Fair Value 17,063 6,336
12 Months or More, Unrealized Losses (4,320) (292)
Total Fair Value 182,598 149,672
Total Unrealized Losses (37,150) (3,188)
Held-to-Maturity Securities, Less than 12 Months, Fair Value 87,855  
Held-to-Maturity Securities, Less than 12 Months, Unrealized Losses (15,353)  
Held-to-Maturity Securities, More than 12 Months, Fair Value 76,024  
Held-to-Maturity Securities, More than 12 Months, Unrealized Losses (12,768)  
Held-to-Maturity Securities, Fair Value 163,879  
Held-to-Maturity Securities, Unrealized Losses (28,121)  
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations    
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value 66,164 91,385
Less than 12 Months, Unrealized Losses (3,371) (905)
12 Months or More, Fair Value 49,176 40,365
12 Months or More, Unrealized Losses (4,385) (372)
Total Fair Value 115,340 131,750
Total Unrealized Losses (7,756) (1,277)
Held-to-Maturity Securities, Less than 12 Months, Fair Value 0  
Held-to-Maturity Securities, Less than 12 Months, Unrealized Losses 0  
Held-to-Maturity Securities, More than 12 Months, Fair Value 9,033  
Held-to-Maturity Securities, More than 12 Months, Unrealized Losses (1,317)  
Held-to-Maturity Securities, Fair Value 9,033  
Held-to-Maturity Securities, Unrealized Losses (1,317)  
Private label mortgage and asset backed securities    
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value 202,786 230,987
Less than 12 Months, Unrealized Losses (26,135) (3,661)
12 Months or More, Fair Value 158,695 28,908
12 Months or More, Unrealized Losses (32,052) (1,032)
Total Fair Value 361,481 259,895
Total Unrealized Losses (58,187) (4,693)
Held-to-Maturity Securities, Less than 12 Months, Fair Value 35,419  
Held-to-Maturity Securities, Less than 12 Months, Unrealized Losses (4,702)  
Held-to-Maturity Securities, More than 12 Months, Fair Value 15,749  
Held-to-Maturity Securities, More than 12 Months, Unrealized Losses (1,331)  
Held-to-Maturity Securities, Fair Value 51,168  
Held-to-Maturity Securities, Unrealized Losses (6,033)  
Corporate debt securities    
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value   21,183
Less than 12 Months, Unrealized Losses   (317)
12 Months or More, Fair Value   0
12 Months or More, Unrealized Losses   0
Total Fair Value   21,183
Total Unrealized Losses   (317)
Held-to-Maturity Securities, Less than 12 Months, Fair Value 26,916  
Held-to-Maturity Securities, Less than 12 Months, Unrealized Losses (1,501)  
Held-to-Maturity Securities, More than 12 Months, Fair Value 16,447  
Held-to-Maturity Securities, More than 12 Months, Unrealized Losses (1,092)  
Held-to-Maturity Securities, Fair Value 43,363  
Held-to-Maturity Securities, Unrealized Losses (2,593)  
U.S. Treasury securities    
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value 0 9,925
Less than 12 Months, Unrealized Losses 0 (63)
12 Months or More, Fair Value 8,548 0
12 Months or More, Unrealized Losses (1,441) 0
Total Fair Value 8,548 9,925
Total Unrealized Losses $ (1,441) $ (63)