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Investments - Unrealized losses (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value $ 632,428 $ 496,816
Less than 12 Months, Unrealized Losses (74,074) (7,842)
12 Months or More, Fair Value 71,847 75,609
12 Months or More, Unrealized Losses (6,163) (1,696)
Total Fair Value 704,275 572,425
Total Unrealized Losses (80,237) (9,538)
Held-to-Maturity Securities, Less than 12 Months, Fair Value 241,093  
Held-to-Maturity Securities, Less than 12 Months, Unrealized Losses (19,297)  
Held-to-Maturity Securities, More than 12 Months, Fair Value 37,772  
Held-to-Maturity Securities, More than 12 Months, Unrealized Losses (2,370)  
Held-to-Maturity Securities, Fair Value 278,865  
Held-to-Maturity Securities, Unrealized Losses (21,667)  
U.S. Government agencies    
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value 332  
Less than 12 Months, Unrealized Losses (19)  
12 Months or More, Fair Value 0  
12 Months or More, Unrealized Losses 0  
Total Fair Value 332  
Total Unrealized Losses (19)  
Obligations of states and political subdivisions    
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value 184,660 143,336
Less than 12 Months, Unrealized Losses (25,843) (2,896)
12 Months or More, Fair Value 8,450 6,336
12 Months or More, Unrealized Losses (1,517) (292)
Total Fair Value 193,110 149,672
Total Unrealized Losses (27,360) (3,188)
Held-to-Maturity Securities, Less than 12 Months, Fair Value 146,938  
Held-to-Maturity Securities, Less than 12 Months, Unrealized Losses (14,670)  
Held-to-Maturity Securities, More than 12 Months, Fair Value 25,849  
Held-to-Maturity Securities, More than 12 Months, Unrealized Losses (1,993)  
Held-to-Maturity Securities, Fair Value 172,787  
Held-to-Maturity Securities, Unrealized Losses (16,663)  
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations    
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value 112,337 91,385
Less than 12 Months, Unrealized Losses (5,818) (905)
12 Months or More, Fair Value 9,302 40,365
12 Months or More, Unrealized Losses (745) (372)
Total Fair Value 121,639 131,750
Total Unrealized Losses (6,563) (1,277)
Held-to-Maturity Securities, Less than 12 Months, Fair Value 9,518  
Held-to-Maturity Securities, Less than 12 Months, Unrealized Losses (752)  
Held-to-Maturity Securities, More than 12 Months, Fair Value 0  
Held-to-Maturity Securities, More than 12 Months, Unrealized Losses 0  
Held-to-Maturity Securities, Fair Value 9,518  
Held-to-Maturity Securities, Unrealized Losses (752)  
Private label mortgage and asset backed securities    
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value 326,168 230,987
Less than 12 Months, Unrealized Losses (41,336) (3,661)
12 Months or More, Fair Value 54,095 28,908
12 Months or More, Unrealized Losses (3,901) (1,032)
Total Fair Value 380,263 259,895
Total Unrealized Losses (45,237) (4,693)
Held-to-Maturity Securities, Less than 12 Months, Fair Value 45,280  
Held-to-Maturity Securities, Less than 12 Months, Unrealized Losses (3,069)  
Held-to-Maturity Securities, More than 12 Months, Fair Value 9,167  
Held-to-Maturity Securities, More than 12 Months, Unrealized Losses (250)  
Held-to-Maturity Securities, Fair Value 54,447  
Held-to-Maturity Securities, Unrealized Losses (3,319)  
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 39,357  
Held-to-Maturity Securities, Less than 12 Months, Unrealized Losses (806)  
Held-to-Maturity Securities, More than 12 Months, Fair Value 2,756  
Held-to-Maturity Securities, More than 12 Months, Unrealized Losses (127)  
Held-to-Maturity Securities, Fair Value 42,113  
Held-to-Maturity Securities, Unrealized Losses (933)  
U.S. Treasury securities    
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value 8,931 9,925
Less than 12 Months, Unrealized Losses (1,058) (63)
12 Months or More, Fair Value 0 0
12 Months or More, Unrealized Losses 0 0
Total Fair Value 8,931 9,925
Total Unrealized Losses $ (1,058) $ (63)