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Securities - Securities in Continuous Loss Position (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Schedule Of Available For Sale Securities [Line Items]    
Available for Sale, Estimated Fair Value, Less than 12 Months $ 156,771 $ 164,222
Available for Sale, Unrealized Losses, Less than 12 Months (5,639) (31)
Available for Sale, Estimated Fair Value, 12 Months or More 99,470 45,590
Available for Sale, Unrealized Losses, 12 Months or More (40) (171)
Available for Sale, Estimated Fair Value, Total 256,241 209,812
Available for Sale, Unrealized Losses, Total (5,679) (202)
Held to Maturity, Estimated Fair Value, Less than 12 Months 5,550,115 7,567,478
Held to Maturity, Unrealized Losses, Less than 12 Months (442,015) (141,790)
Held to Maturity, Estimated Fair Value, 12 Months or More 6,606,126 289,813
Held to Maturity, Unrealized Losses, 12 Months or More (1,194,183) (5,384)
Held to Maturity, Estimated Fair Value, Total 12,156,241 7,857,291
Held to Maturity, Unrealized Losses, Total (1,636,198) (147,174)
Collateralized Mortgage Obligations [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available for Sale, Estimated Fair Value, Less than 12 Months 61,559 164,220
Available for Sale, Unrealized Losses, Less than 12 Months (3,012) (31)
Available for Sale, Estimated Fair Value, 12 Months or More 99,179 25,916
Available for Sale, Unrealized Losses, 12 Months or More (27) (1)
Available for Sale, Estimated Fair Value, Total 160,738 190,136
Available for Sale, Unrealized Losses, Total (3,039) (32)
Held to Maturity, Estimated Fair Value, Less than 12 Months 214,538 8,166
Held to Maturity, Unrealized Losses, Less than 12 Months (22,557) (78)
Held to Maturity, Estimated Fair Value, 12 Months or More 4,358  
Held to Maturity, Unrealized Losses, 12 Months or More (365)  
Held to Maturity, Estimated Fair Value, Total 218,896 8,166
Held to Maturity, Unrealized Losses, Total (22,922) (78)
Mortgage-backed Securities [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available for Sale, Estimated Fair Value, Less than 12 Months 95,212 2
Available for Sale, Unrealized Losses, Less than 12 Months (2,627)  
Available for Sale, Estimated Fair Value, 12 Months or More 291 19,674
Available for Sale, Unrealized Losses, 12 Months or More (13) (170)
Available for Sale, Estimated Fair Value, Total 95,503 19,676
Available for Sale, Unrealized Losses, Total (2,640) (170)
Held to Maturity, Estimated Fair Value, Less than 12 Months 5,276,315 7,553,096
Held to Maturity, Unrealized Losses, Less than 12 Months (416,053) (141,652)
Held to Maturity, Estimated Fair Value, 12 Months or More 6,585,470 288,359
Held to Maturity, Unrealized Losses, 12 Months or More (1,191,448) (5,330)
Held to Maturity, Estimated Fair Value, Total 11,861,785 7,841,455
Held to Maturity, Unrealized Losses, Total (1,607,501) (146,982)
States and Political Subdivisions [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Held to Maturity, Estimated Fair Value, Less than 12 Months 49,782 6,216
Held to Maturity, Unrealized Losses, Less than 12 Months (885) (60)
Held to Maturity, Estimated Fair Value, 12 Months or More 16,298 1,454
Held to Maturity, Unrealized Losses, 12 Months or More (2,370) (54)
Held to Maturity, Estimated Fair Value, Total 66,080 7,670
Held to Maturity, Unrealized Losses, Total (3,255) $ (114)
Corporate Debt Securities [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Held to Maturity, Estimated Fair Value, Less than 12 Months 9,480  
Held to Maturity, Unrealized Losses, Less than 12 Months (2,520)  
Held to Maturity, Estimated Fair Value, Total 9,480  
Held to Maturity, Unrealized Losses, Total $ (2,520)