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Securities - Securities in Continuous Loss Position (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Schedule Of Available For Sale Securities [Line Items]    
Available for Sale, Estimated Fair Value, Less than 12 Months $ 67,627 $ 15,124
Available for Sale, Unrealized Losses, Less than 12 Months (473) (101)
Available for Sale, Estimated Fair Value, More than 12 Months 3,947 4,157
Available for Sale, Unrealized Losses, More than 12 Months (54) (56)
Available for Sale, Estimated Fair Value, Total 71,574 19,281
Available for Sale, Unrealized Losses, Total (527) (157)
Held to Maturity, Estimated Fair Value, Less than 12 Months 881,666 3,249,457
Held to Maturity, Unrealized Losses, Less than 12 Months (1,079) (36,098)
Held to Maturity, Estimated Fair Value, More than 12 Months 102,012 1,708,528
Held to Maturity, Unrealized Losses, More than 12 Months (587) (46,853)
Held to Maturity, Estimated Fair Value, Total 983,678 4,957,985
Held to Maturity, Unrealized Losses, Total (1,666) (82,951)
Collateralized Mortgage Obligations [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available for Sale, Estimated Fair Value, Less than 12 Months 18,791 14,331
Available for Sale, Unrealized Losses, Less than 12 Months (307) (100)
Available for Sale, Estimated Fair Value, More than 12 Months 25 1
Available for Sale, Estimated Fair Value, Total 18,816 14,332
Available for Sale, Unrealized Losses, Total (307) (100)
Held to Maturity, Estimated Fair Value, Less than 12 Months 131 156
Held to Maturity, Unrealized Losses, Less than 12 Months (4)  
Held to Maturity, Estimated Fair Value, More than 12 Months 52 94
Held to Maturity, Unrealized Losses, More than 12 Months   (2)
Held to Maturity, Estimated Fair Value, Total 183 250
Held to Maturity, Unrealized Losses, Total (4) (2)
Collateralized Mortgage Backed Securities [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available for Sale, Estimated Fair Value, Less than 12 Months 48,836 793
Available for Sale, Unrealized Losses, Less than 12 Months (166) (1)
Available for Sale, Estimated Fair Value, More than 12 Months 2,231 2,465
Available for Sale, Unrealized Losses, More than 12 Months (8) (10)
Available for Sale, Estimated Fair Value, Total 51,067 3,258
Available for Sale, Unrealized Losses, Total (174) (11)
Held to Maturity, Estimated Fair Value, Less than 12 Months 877,968 3,233,601
Held to Maturity, Unrealized Losses, Less than 12 Months (1,067) (36,016)
Held to Maturity, Estimated Fair Value, More than 12 Months 97,324 1,662,482
Held to Maturity, Unrealized Losses, More than 12 Months (550) (46,391)
Held to Maturity, Estimated Fair Value, Total 975,292 4,896,083
Held to Maturity, Unrealized Losses, Total (1,617) (82,407)
Other Securities [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available for Sale, Estimated Fair Value, More than 12 Months 1,691 1,691
Available for Sale, Unrealized Losses, More than 12 Months (46) (46)
Available for Sale, Estimated Fair Value, Total 1,691 1,691
Available for Sale, Unrealized Losses, Total (46) (46)
US States and Political Subdivisions Debt Securities [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Held to Maturity, Estimated Fair Value, Less than 12 Months 3,567 15,700
Held to Maturity, Unrealized Losses, Less than 12 Months (8) (82)
Held to Maturity, Estimated Fair Value, More than 12 Months 4,636 45,952
Held to Maturity, Unrealized Losses, More than 12 Months (37) (460)
Held to Maturity, Estimated Fair Value, Total 8,203 61,652
Held to Maturity, Unrealized Losses, Total $ (45) $ (542)