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Securities - Securities in Continuous Loss Position (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Schedule Of Available For Sale Securities [Line Items]    
Available for Sale, Estimated Fair Value, Less than 12 Months $ 76,297 $ 55,991
Available for Sale, Unrealized Losses, Less than 12 Months (412) (420)
Available for Sale, Estimated Fair Value, 12 Months or More 235,897 215,455
Available for Sale, Unrealized Losses, 12 Months or More (4,207) (3,793)
Available for Sale, Estimated Fair Value, Total 312,194 271,446
Available for Sale, Unrealized Losses, Total (4,619) (4,213)
Held to Maturity, Estimated Fair Value, Less than 12 Months 225,619 388,714
Held to Maturity, Unrealized Losses, Less than 12 Months (2,578) (5,467)
Held to Maturity, Estimated Fair Value, 12 Months or More 8,418,833 8,882,499
Held to Maturity, Unrealized Losses, 12 Months or More (1,112,406) (1,370,118)
Held to Maturity, Estimated Fair Value, Total 8,644,452 9,271,213
Held to Maturity, Unrealized Losses, Total (1,114,984) (1,375,585)
Corporate Debt Securities [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available for Sale, Estimated Fair Value, Less than 12 Months   2,040
Available for Sale, Unrealized Losses, Less than 12 Months   (60)
Available for Sale, Estimated Fair Value, Total   2,040
Available for Sale, Unrealized Losses, Total   (60)
Held to Maturity, Estimated Fair Value, 12 Months or More 9,480 8,160
Held to Maturity, Unrealized Losses, 12 Months or More (2,520) (3,840)
Held to Maturity, Estimated Fair Value, Total 9,480 8,160
Held to Maturity, Unrealized Losses, Total (2,520) (3,840)
Collateralized Mortgage Obligations [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available for Sale, Estimated Fair Value, Less than 12 Months 66,621 47,114
Available for Sale, Unrealized Losses, Less than 12 Months (357) (307)
Available for Sale, Estimated Fair Value, 12 Months or More 142,720 125,942
Available for Sale, Unrealized Losses, 12 Months or More (3,432) (2,926)
Available for Sale, Estimated Fair Value, Total 209,341 173,056
Available for Sale, Unrealized Losses, Total (3,789) (3,233)
Held to Maturity, Estimated Fair Value, Less than 12 Months 26,962 28,362
Held to Maturity, Unrealized Losses, Less than 12 Months (96) (663)
Held to Maturity, Estimated Fair Value, 12 Months or More 172,831 179,855
Held to Maturity, Unrealized Losses, 12 Months or More (16,151) (23,465)
Held to Maturity, Estimated Fair Value, Total 199,793 208,217
Held to Maturity, Unrealized Losses, Total (16,247) (24,128)
Mortgage-backed Securities [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available for Sale, Estimated Fair Value, Less than 12 Months 9,676 6,837
Available for Sale, Unrealized Losses, Less than 12 Months (55) (53)
Available for Sale, Estimated Fair Value, 12 Months or More 93,177 89,513
Available for Sale, Unrealized Losses, 12 Months or More (775) (867)
Available for Sale, Estimated Fair Value, Total 102,853 96,350
Available for Sale, Unrealized Losses, Total (830) (920)
Held to Maturity, Estimated Fair Value, Less than 12 Months 182,819 331,265
Held to Maturity, Unrealized Losses, Less than 12 Months (2,432) (4,647)
Held to Maturity, Estimated Fair Value, 12 Months or More 8,201,868 8,646,541
Held to Maturity, Unrealized Losses, 12 Months or More (1,091,627) (1,340,416)
Held to Maturity, Estimated Fair Value, Total 8,384,687 8,977,806
Held to Maturity, Unrealized Losses, Total (1,094,059) (1,345,063)
U.S. Government Agencies [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Held to Maturity, Estimated Fair Value, Less than 12 Months 5,930 5,817
Held to Maturity, Unrealized Losses, Less than 12 Months (16) (44)
Held to Maturity, Estimated Fair Value, Total 5,930 5,817
Held to Maturity, Unrealized Losses, Total (16) (44)
States and Political Subdivisions [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Held to Maturity, Estimated Fair Value, Less than 12 Months 9,908 23,270
Held to Maturity, Unrealized Losses, Less than 12 Months (34) (113)
Held to Maturity, Estimated Fair Value, 12 Months or More 34,654 47,943
Held to Maturity, Unrealized Losses, 12 Months or More (2,108) (2,397)
Held to Maturity, Estimated Fair Value, Total 44,562 71,213
Held to Maturity, Unrealized Losses, Total $ (2,142) $ (2,510)