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Securities - Schedule of Amortized Cost and Fair Value of Investment Securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Schedule Of Available For Sale Securities [Line Items]    
Available for Sale, Amortized Cost $ 460,898 $ 512,642
Available for Sale, Gross Unrealized Gains 1,283 2,492
Available for Sale, Gross Unrealized Losses (5,679) (202)
Available for Sale 456,502 514,932
Held to Maturity, Amortized Cost 14,019,503 12,303,969
Held to Maturity, Gross Unrealized Gains 3,820 94,418
Held to Maturity, Gross Unrealized Losses (1,636,198) (147,174)
Held to Maturity 12,387,125 12,251,213
Collateralized Mortgage Obligations [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available for Sale, Amortized Cost 359,251 483,761
Available for Sale, Gross Unrealized Gains 1,190 1,942
Available for Sale, Gross Unrealized Losses (3,039) (32)
Available for Sale 357,402 485,671
Held to Maturity, Amortized Cost 271,727 39,675
Held to Maturity, Gross Unrealized Gains 377 483
Held to Maturity, Gross Unrealized Losses (22,922) (78)
Held to Maturity 249,182 40,080
Mortgage-backed Securities [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available for Sale, Amortized Cost 101,647 28,881
Available for Sale, Gross Unrealized Gains 93 550
Available for Sale, Gross Unrealized Losses (2,640) (170)
Available for Sale 99,100 29,261
Held to Maturity, Amortized Cost 13,613,415 12,131,674
Held to Maturity, Gross Unrealized Gains 2,575 87,967
Held to Maturity, Gross Unrealized Losses (1,607,501) (146,982)
Held to Maturity 12,008,489 12,072,659
States and Political Subdivisions [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Held to Maturity, Amortized Cost 122,361 132,620
Held to Maturity, Gross Unrealized Gains 868 5,968
Held to Maturity, Gross Unrealized Losses (3,255) (114)
Held to Maturity 119,974 $ 138,474
Corporate Debt Securities [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Held to Maturity, Amortized Cost 12,000  
Held to Maturity, Gross Unrealized Losses (2,520)  
Held to Maturity $ 9,480