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Securities - Securities in Continuous Loss Position (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Schedule Of Available For Sale Securities [Line Items]    
Available for Sale, Estimated Fair Value, Less than 12 Months $ 55,991 $ 63,065
Available for Sale, Unrealized Losses, Less than 12 Months (420) (1,480)
Available for Sale, Estimated Fair Value, 12 Months or More 215,455 206,969
Available for Sale, Unrealized Losses, 12 Months or More (3,793) (3,180)
Available for Sale, Estimated Fair Value, Total 271,446 270,034
Available for Sale, Unrealized Losses, Total (4,213) (4,660)
Held to Maturity, Estimated Fair Value, Less than 12 Months 388,714 133,665
Held to Maturity, Unrealized Losses, Less than 12 Months (5,467) (1,408)
Held to Maturity, Estimated Fair Value, 12 Months or More 8,882,499 10,595,558
Held to Maturity, Unrealized Losses, 12 Months or More (1,370,118) (1,383,297)
Held to Maturity, Estimated Fair Value, Total 9,271,213 10,729,223
Held to Maturity, Unrealized Losses, Total (1,375,585) (1,384,705)
Corporate Debt Securities [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available for Sale, Estimated Fair Value, Less than 12 Months 2,040 7,300
Available for Sale, Unrealized Losses, Less than 12 Months (60) (738)
Available for Sale, Estimated Fair Value, Total 2,040 7,300
Available for Sale, Unrealized Losses, Total (60) (738)
Held to Maturity, Estimated Fair Value, 12 Months or More 8,160 7,800
Held to Maturity, Unrealized Losses, 12 Months or More (3,840) (4,200)
Held to Maturity, Estimated Fair Value, Total 8,160 7,800
Held to Maturity, Unrealized Losses, Total (3,840) (4,200)
Collateralized Mortgage Obligations [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available for Sale, Estimated Fair Value, Less than 12 Months 47,114 54,611
Available for Sale, Unrealized Losses, Less than 12 Months (307) (729)
Available for Sale, Estimated Fair Value, 12 Months or More 125,942 114,758
Available for Sale, Unrealized Losses, 12 Months or More (2,926) (2,075)
Available for Sale, Estimated Fair Value, Total 173,056 169,369
Available for Sale, Unrealized Losses, Total (3,233) (2,804)
Held to Maturity, Estimated Fair Value, Less than 12 Months 28,362 50,147
Held to Maturity, Unrealized Losses, Less than 12 Months (663) (470)
Held to Maturity, Estimated Fair Value, 12 Months or More 179,855 192,205
Held to Maturity, Unrealized Losses, 12 Months or More (23,465) (20,394)
Held to Maturity, Estimated Fair Value, Total 208,217 242,352
Held to Maturity, Unrealized Losses, Total (24,128) (20,864)
Mortgage-backed Securities [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available for Sale, Estimated Fair Value, Less than 12 Months 6,837 1,154
Available for Sale, Unrealized Losses, Less than 12 Months (53) (13)
Available for Sale, Estimated Fair Value, 12 Months or More 89,513 92,211
Available for Sale, Unrealized Losses, 12 Months or More (867) (1,105)
Available for Sale, Estimated Fair Value, Total 96,350 93,365
Available for Sale, Unrealized Losses, Total (920) (1,118)
Held to Maturity, Estimated Fair Value, Less than 12 Months 331,265 52,853
Held to Maturity, Unrealized Losses, Less than 12 Months (4,647) (807)
Held to Maturity, Estimated Fair Value, 12 Months or More 8,646,541 10,354,514
Held to Maturity, Unrealized Losses, 12 Months or More (1,340,416) (1,356,476)
Held to Maturity, Estimated Fair Value, Total 8,977,806 10,407,367
Held to Maturity, Unrealized Losses, Total (1,345,063) (1,357,283)
U.S. Treasury Securities and Obligations of U.S. Government Agencies [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Held to Maturity, Estimated Fair Value, Less than 12 Months 5,817 7,580
Held to Maturity, Unrealized Losses, Less than 12 Months (44) (52)
Held to Maturity, Estimated Fair Value, Total 5,817 7,580
Held to Maturity, Unrealized Losses, Total (44) (52)
States and Political Subdivisions [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Held to Maturity, Estimated Fair Value, Less than 12 Months 23,270 23,085
Held to Maturity, Unrealized Losses, Less than 12 Months (113) (79)
Held to Maturity, Estimated Fair Value, 12 Months or More 47,943 41,039
Held to Maturity, Unrealized Losses, 12 Months or More (2,397) (2,227)
Held to Maturity, Estimated Fair Value, Total 71,213 64,124
Held to Maturity, Unrealized Losses, Total $ (2,510) $ (2,306)