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Securities - Unrealized Losses (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Fair Value    
Less than 12 Months $ 1,570,763 $ 801,669
12 Months or More 149,549 59,519
Total 1,720,312 861,188
Unrealized Loss    
Less than 12 Months (129,698) (12,783)
12 Months or More (19,124) (1,843)
Total (148,822) (14,626)
State and municipal securities    
Fair Value    
Less than 12 Months 324,447 82,627
12 Months or More 18,104 16,617
Total 342,551 99,244
Unrealized Loss    
Less than 12 Months (43,812) (1,651)
12 Months or More (4,476) (672)
Total (48,288) (2,323)
Fair Value    
Less than 12 Months 0 0
12 Months or More 0 0
Total 0 0
Unrealized Loss    
Less than 12 Months 0 0
12 Months or More 0 0
Total 0 0
Corporate bonds    
Fair Value    
Less than 12 Months 59,831 13,299
12 Months or More 2,892 2,928
Total 62,723 16,227
Unrealized Loss    
Less than 12 Months (2,607) (201)
12 Months or More (108) (72)
Total (2,715) (273)
U.S. government and agency securities    
Fair Value    
Less than 12 Months 252,402 97,010
12 Months or More 4,219 440
Total 256,621 97,450
Unrealized Loss    
Less than 12 Months (10,340) (1,234)
12 Months or More (678) (2)
Total (11,018) (1,236)
Commercial mortgage-backed securities    
Fair Value    
Less than 12 Months 104,995 57,703
12 Months or More 5,702 6,540
Total 110,697 64,243
Unrealized Loss    
Less than 12 Months (8,978) (1,167)
12 Months or More (1,112) (281)
Total (10,090) (1,448)
Residential mortgage-backed securities    
Fair Value    
Less than 12 Months 597,693 409,382
12 Months or More 45,299 1,693
Total 642,992 411,075
Unrealized Loss    
Less than 12 Months (49,628) (5,577)
12 Months or More (4,646) (28)
Total (54,274) (5,605)
Commercial collateralized mortgage obligations    
Fair Value    
Less than 12 Months 37,314 14,568
12 Months or More 3,651 0
Total 40,965 14,568
Unrealized Loss    
Less than 12 Months (3,406) (330)
12 Months or More (505) 0
Total (3,911) (330)
Residential collateralized mortgage obligations    
Fair Value    
Less than 12 Months 117,674 127,080
12 Months or More 69,682 31,301
Total 187,356 158,381
Unrealized Loss    
Less than 12 Months (8,614) (2,623)
12 Months or More (7,599) (788)
Total (16,213) $ (3,411)
Asset-backed securities    
Fair Value    
Less than 12 Months 76,407  
12 Months or More 0  
Total 76,407  
Unrealized Loss    
Less than 12 Months (2,313)  
12 Months or More 0  
Total $ (2,313)