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Debt Securities - AFS Debt Securities in an Unrealized Loss Position (Details)
$ in Thousands
Sep. 30, 2021
USD ($)
security
Dec. 31, 2020
USD ($)
security
Available-for-sale    
Number of available-for-sale securities | security 174 46
Less than 12 months, fair value $ 3,885,154 $ 145,530
Less than 12 months, unrealized loss (22,568) (783)
12 months or more, fair value 121,504 753
12 months or more, unrealized loss (3,048) (9)
Total, fair value 4,006,658 146,283
Total, unrealized loss $ (25,616) $ (792)
Held-to-maturity    
Number of held-to-maturity securities | security 126  
Less than 12 Months $ 317,479  
Less than 12 Months (1,977)  
12 Months or More 0  
12 Months or More 0  
Total, fair value 317,479  
Total, unrealized loss $ (1,977)  
U.S. government and federal agency    
Available-for-sale    
Number of available-for-sale securities | security 23 18
Less than 12 months, fair value $ 9,736 $ 13,814
Less than 12 months, unrealized loss (78) (258)
12 months or more, fair value 5,398 726
12 months or more, unrealized loss (205) (9)
Total, fair value 15,134 14,540
Total, unrealized loss $ (283) $ (267)
U.S. government sponsored enterprises    
Available-for-sale    
Number of available-for-sale securities | security 3  
Less than 12 months, fair value $ 45,279  
Less than 12 months, unrealized loss (279)  
12 months or more, fair value 0  
12 months or more, unrealized loss 0  
Total, fair value 45,279  
Total, unrealized loss $ (279)  
State and local governments    
Available-for-sale    
Number of available-for-sale securities | security 11 6
Less than 12 months, fair value $ 15,596 $ 3,121
Less than 12 months, unrealized loss (30) (54)
12 months or more, fair value 1,742 0
12 months or more, unrealized loss (61) 0
Total, fair value 17,338 3,121
Total, unrealized loss $ (91) $ (54)
Held-to-maturity    
Number of held-to-maturity securities | security 126  
Less than 12 Months $ 317,479  
Less than 12 Months (1,977)  
12 Months or More 0  
12 Months or More 0  
Total, fair value 317,479  
Total, unrealized loss $ (1,977)  
Corporate bonds    
Available-for-sale    
Number of available-for-sale securities | security 1 3
Less than 12 months, fair value $ 5,016 $ 5,500
Less than 12 months, unrealized loss (3) (8)
12 months or more, fair value 0 0
12 months or more, unrealized loss 0 0
Total, fair value 5,016 5,500
Total, unrealized loss $ (3) $ (8)
Residential mortgage-backed securities    
Available-for-sale    
Number of available-for-sale securities | security 115 14
Less than 12 months, fair value $ 3,730,195 $ 2,354
Less than 12 months, unrealized loss (21,312) (4)
12 months or more, fair value 26 27
12 months or more, unrealized loss (1) 0
Total, fair value 3,730,221 2,381
Total, unrealized loss $ (21,313) $ (4)
Commercial mortgage-backed securities    
Available-for-sale    
Number of available-for-sale securities | security 21 5
Less than 12 months, fair value $ 79,332 $ 120,741
Less than 12 months, unrealized loss (866) (459)
12 months or more, fair value 114,338 0
12 months or more, unrealized loss (2,781) 0
Total, fair value 193,670 120,741
Total, unrealized loss $ (3,647) $ (459)