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Debt Securities - Unrealized Loss Position (Details)
$ in Thousands
Dec. 31, 2021
USD ($)
security
Dec. 31, 2020
USD ($)
security
Debt Securities    
Number of securities | security 263 46
Less than 12 months, fair value $ 7,231,306 $ 145,530
Less than 12 months, unrealized loss (67,190) (783)
12 months or more, fair value 187,060 753
12 months or longer, unrealized loss (5,501) (9)
Total, fair value 7,418,366 146,283
Total, unrealized loss $ (72,691) $ (792)
U.S. government and federal agency    
Debt Securities    
Number of securities | security 50 18
Less than 12 months, fair value $ 1,329,399 $ 13,814
Less than 12 months, unrealized loss (9,344) (258)
12 months or more, fair value 5,457 726
12 months or longer, unrealized loss (252) (9)
Total, fair value 1,334,856 14,540
Total, unrealized loss $ (9,596) $ (267)
U.S. government sponsored enterprises    
Debt Securities    
Number of securities | security 11  
Less than 12 months, fair value $ 239,928  
Less than 12 months, unrealized loss (996)  
12 months or more, fair value 0  
12 months or longer, unrealized loss 0  
Total, fair value 239,928  
Total, unrealized loss $ (996)  
State and local governments    
Debt Securities    
Number of securities | security 10 6
Less than 12 months, fair value $ 11,080 $ 3,121
Less than 12 months, unrealized loss (83) (54)
12 months or more, fair value 1,760 0
12 months or longer, unrealized loss (40) 0
Total, fair value 12,840 3,121
Total, unrealized loss $ (123) $ (54)
Corporate bonds    
Debt Securities    
Number of securities | security 3 3
Less than 12 months, fair value $ 12,483 $ 5,500
Less than 12 months, unrealized loss (17) (8)
12 months or more, fair value 0 0
12 months or longer, unrealized loss 0 0
Total, fair value 12,483 5,500
Total, unrealized loss $ (17) $ (8)
Residential mortgage-backed securities    
Debt Securities    
Number of securities | security 151 14
Less than 12 months, fair value $ 5,335,632 $ 2,354
Less than 12 months, unrealized loss (53,434) (4)
12 months or more, fair value 53,045 27
12 months or longer, unrealized loss (832) 0
Total, fair value 5,388,677 2,381
Total, unrealized loss $ (54,266) $ (4)
Commercial mortgage-backed securities    
Debt Securities    
Number of securities | security 38 5
Less than 12 months, fair value $ 302,784 $ 120,741
Less than 12 months, unrealized loss (3,316) (459)
12 months or more, fair value 126,798 0
12 months or longer, unrealized loss (4,377) 0
Total, fair value 429,582 120,741
Total, unrealized loss $ (7,693) $ (459)