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Investments - Unrealized losses (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value $ 926,452 $ 496,816
Less than 12 Months, Unrealized Losses (62,862) (7,842)
12 Months or More, Fair Value 115,013 75,609
12 Months or More, Unrealized Losses (9,497) (1,696)
Total Fair Value 1,041,465 572,425
Total Unrealized Losses (72,359) (9,538)
U.S. Government agencies    
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value 343  
Less than 12 Months, Unrealized Losses (12)  
12 Months or More, Fair Value 0  
12 Months or More, Unrealized Losses 0  
Total Fair Value 343  
Total Unrealized Losses (12)  
Obligations of states and political subdivisions    
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value 366,394 143,336
Less than 12 Months, Unrealized Losses (27,627) (2,896)
12 Months or More, Fair Value 19,762 6,336
12 Months or More, Unrealized Losses (3,777) (292)
Total Fair Value 386,156 149,672
Total Unrealized Losses (31,404) (3,188)
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations    
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value 119,477 91,385
Less than 12 Months, Unrealized Losses (3,945) (905)
12 Months or More, Fair Value 45,880 40,365
12 Months or More, Unrealized Losses (1,546) (372)
Total Fair Value 165,357 131,750
Total Unrealized Losses (5,491) (1,277)
Private label mortgage and asset backed securities    
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value 394,277 230,987
Less than 12 Months, Unrealized Losses (28,751) (3,661)
12 Months or More, Fair Value 49,371 28,908
12 Months or More, Unrealized Losses (4,174) (1,032)
Total Fair Value 443,648 259,895
Total Unrealized Losses (32,925) (4,693)
Corporate debt securities    
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value 36,703 21,183
Less than 12 Months, Unrealized Losses (1,797) (317)
12 Months or More, Fair Value 0 0
12 Months or More, Unrealized Losses 0 0
Total Fair Value 36,703 21,183
Total Unrealized Losses (1,797) $ (317)
U.S. Treasury securities    
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value 9,258  
Less than 12 Months, Unrealized Losses (730)  
12 Months or More, Fair Value 0  
12 Months or More, Unrealized Losses 0  
Total Fair Value 9,258  
Total Unrealized Losses $ (730)