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Securities - Securities in Continuous Loss Position (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Schedule Of Available For Sale Securities [Line Items]    
Available for Sale, Estimated Fair Value, Less than 12 Months $ 44,338 $ 63,065
Available for Sale, Unrealized Losses, Less than 12 Months (342) (1,480)
Available for Sale, Estimated Fair Value, 12 Months or More 242,361 206,969
Available for Sale, Unrealized Losses, 12 Months or More (3,668) (3,180)
Available for Sale, Estimated Fair Value, Total 286,699 270,034
Available for Sale, Unrealized Losses, Total (4,010) (4,660)
Held to Maturity, Estimated Fair Value, Less than 12 Months 137,699 133,665
Held to Maturity, Unrealized Losses, Less than 12 Months (1,915) (1,408)
Held to Maturity, Estimated Fair Value, 12 Months or More 9,698,466 10,595,558
Held to Maturity, Unrealized Losses, 12 Months or More (1,390,148) (1,383,297)
Held to Maturity, Estimated Fair Value, Total 9,836,165 10,729,223
Held to Maturity, Unrealized Losses, Total (1,392,063) (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   7,300
Available for Sale, Unrealized Losses, Less than 12 Months   (738)
Available for Sale, Estimated Fair Value, 12 Months or More 5,420  
Available for Sale, Unrealized Losses, 12 Months or More (180)  
Available for Sale, Estimated Fair Value, Total 5,420 7,300
Available for Sale, Unrealized Losses, Total (180) (738)
Held to Maturity, Estimated Fair Value, 12 Months or More 8,280 7,800
Held to Maturity, Unrealized Losses, 12 Months or More (3,720) (4,200)
Held to Maturity, Estimated Fair Value, Total 8,280 7,800
Held to Maturity, Unrealized Losses, Total (3,720) (4,200)
Collateralized Mortgage Obligations [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available for Sale, Estimated Fair Value, Less than 12 Months 30,132 54,611
Available for Sale, Unrealized Losses, Less than 12 Months (323) (729)
Available for Sale, Estimated Fair Value, 12 Months or More 145,045 114,758
Available for Sale, Unrealized Losses, 12 Months or More (2,553) (2,075)
Available for Sale, Estimated Fair Value, Total 175,177 169,369
Available for Sale, Unrealized Losses, Total (2,876) (2,804)
Held to Maturity, Estimated Fair Value, Less than 12 Months 26,765 50,147
Held to Maturity, Unrealized Losses, Less than 12 Months (359) (470)
Held to Maturity, Estimated Fair Value, 12 Months or More 198,619 192,205
Held to Maturity, Unrealized Losses, 12 Months or More (22,371) (20,394)
Held to Maturity, Estimated Fair Value, Total 225,384 242,352
Held to Maturity, Unrealized Losses, Total (22,730) (20,864)
Mortgage-backed Securities [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available for Sale, Estimated Fair Value, Less than 12 Months 14,206 1,154
Available for Sale, Unrealized Losses, Less than 12 Months (19) (13)
Available for Sale, Estimated Fair Value, 12 Months or More 91,896 92,211
Available for Sale, Unrealized Losses, 12 Months or More (935) (1,105)
Available for Sale, Estimated Fair Value, Total 106,102 93,365
Available for Sale, Unrealized Losses, Total (954) (1,118)
Held to Maturity, Estimated Fair Value, Less than 12 Months 88,246 52,853
Held to Maturity, Unrealized Losses, Less than 12 Months (1,413) (807)
Held to Maturity, Estimated Fair Value, 12 Months or More 9,423,661 10,354,514
Held to Maturity, Unrealized Losses, 12 Months or More (1,360,999) (1,356,476)
Held to Maturity, Estimated Fair Value, Total 9,511,907 10,407,367
Held to Maturity, Unrealized Losses, Total (1,362,412) (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   7,580
Held to Maturity, Unrealized Losses, Less than 12 Months   (52)
Held to Maturity, Estimated Fair Value, 12 Months or More 7,639  
Held to Maturity, Unrealized Losses, 12 Months or More (111)  
Held to Maturity, Estimated Fair Value, Total 7,639 7,580
Held to Maturity, Unrealized Losses, Total (111) (52)
States and Political Subdivisions [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Held to Maturity, Estimated Fair Value, Less than 12 Months 22,688 23,085
Held to Maturity, Unrealized Losses, Less than 12 Months (143) (79)
Held to Maturity, Estimated Fair Value, 12 Months or More 60,267 41,039
Held to Maturity, Unrealized Losses, 12 Months or More (2,947) (2,227)
Held to Maturity, Estimated Fair Value, Total 82,955 64,124
Held to Maturity, Unrealized Losses, Total $ (3,090) $ (2,306)