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Securities - Securities in Continuous Loss Position (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Schedule Of Available For Sale Securities [Line Items]    
Available for Sale, Estimated Fair Value, Less than 12 Months $ 27,001 $ 50,962
Available for Sale, Unrealized Losses, Less than 12 Months (11) (197)
Available for Sale, Estimated Fair Value, 12 Months or More 2,081 4,187
Available for Sale, Unrealized Losses, 12 Months or More (27) (40)
Available for Sale, Estimated Fair Value, Total 29,082 55,149
Available for Sale, Unrealized Losses, Total (38) (237)
Held to Maturity, Estimated Fair Value, Less than 12 Months 77,382 1,113,216
Held to Maturity, Unrealized Losses, Less than 12 Months (290) (8,805)
Held to Maturity, Estimated Fair Value, 12 Months or More 6,530,007 6,937,459
Held to Maturity, Unrealized Losses, 12 Months or More (115,088) (244,009)
Held to Maturity, Estimated Fair Value, Total 6,607,389 8,050,675
Held to Maturity, Unrealized Losses, Total (115,378) (252,814)
Collateralized Mortgage Obligations [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available for Sale, Estimated Fair Value, Less than 12 Months 3,337 12
Available for Sale, Unrealized Losses, Less than 12 Months (6)  
Available for Sale, Estimated Fair Value, 12 Months or More 2,007 2,096
Available for Sale, Unrealized Losses, 12 Months or More (26) (37)
Available for Sale, Estimated Fair Value, Total 5,344 2,108
Available for Sale, Unrealized Losses, Total (32) (37)
Held to Maturity, Estimated Fair Value, Less than 12 Months 82  
Held to Maturity, Unrealized Losses, Less than 12 Months (2)  
Held to Maturity, Estimated Fair Value, 12 Months or More 281 292
Held to Maturity, Unrealized Losses, 12 Months or More   (2)
Held to Maturity, Estimated Fair Value, Total 363 292
Held to Maturity, Unrealized Losses, Total (2) (2)
Collateralized Mortgage Backed Securities [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available for Sale, Estimated Fair Value, Less than 12 Months 23,664 50,950
Available for Sale, Unrealized Losses, Less than 12 Months (5) (197)
Available for Sale, Estimated Fair Value, 12 Months or More 74 2,091
Available for Sale, Unrealized Losses, 12 Months or More (1) (3)
Available for Sale, Estimated Fair Value, Total 23,738 53,041
Available for Sale, Unrealized Losses, Total (6) (200)
Held to Maturity, Estimated Fair Value, Less than 12 Months 54,633 1,003,089
Held to Maturity, Unrealized Losses, Less than 12 Months (262) (8,401)
Held to Maturity, Estimated Fair Value, 12 Months or More 6,477,004 6,873,948
Held to Maturity, Unrealized Losses, 12 Months or More (114,976) (243,534)
Held to Maturity, Estimated Fair Value, Total 6,531,637 7,877,037
Held to Maturity, Unrealized Losses, Total (115,238) (251,935)
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   20,720
Held to Maturity, Unrealized Losses, Less than 12 Months   (76)
Held to Maturity, Estimated Fair Value, 12 Months or More 18,849 4,957
Held to Maturity, Unrealized Losses, 12 Months or More (56) (24)
Held to Maturity, Estimated Fair Value, Total 18,849 25,677
Held to Maturity, Unrealized Losses, Total (56) (100)
US States and Political Subdivisions [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Held to Maturity, Estimated Fair Value, Less than 12 Months 22,667 89,407
Held to Maturity, Unrealized Losses, Less than 12 Months (26) (328)
Held to Maturity, Estimated Fair Value, 12 Months or More 33,873 58,262
Held to Maturity, Unrealized Losses, 12 Months or More (56) (449)
Held to Maturity, Estimated Fair Value, Total 56,540 147,669
Held to Maturity, Unrealized Losses, Total $ (82) $ (777)