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Securities (Securities Available for Sale with Unrealized Losses) (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Schedule of Available-for-sale Securities [Line Items]    
Securities available for sale, Losses less than 12 months, Fair Value $ 110,726 $ 442,773
Securities available for sale, Losses less than 12 months, Gross Unrealized Losses 898 4,928
Securities available for sale, Losses 12 months or longer, Fair Value 457,528 1,687,704
Securities available for sale, Losses 12 months or longer, Gross Unrealized Losses 2,308 67,340
Securities available for sale, Total, Fair Value 568,254 2,130,477
Available for sale, Total, Gross Unrealized Losses 3,206 72,268
U.S. Treasury And Government Agency Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Securities available for sale, Losses 12 months or longer, Fair Value   71,706
Securities available for sale, Losses 12 months or longer, Gross Unrealized Losses   2,633
Securities available for sale, Total, Fair Value   71,706
Available for sale, Total, Gross Unrealized Losses   2,633
Municipal Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Securities available for sale, Losses less than 12 months, Fair Value   41,203
Securities available for sale, Losses less than 12 months, Gross Unrealized Losses   591
Securities available for sale, Losses 12 months or longer, Fair Value   170,883
Securities available for sale, Losses 12 months or longer, Gross Unrealized Losses   6,054
Securities available for sale, Total, Fair Value   212,086
Available for sale, Total, Gross Unrealized Losses   6,645
Residential Mortgage-Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Securities available for sale, Losses less than 12 months, Fair Value 2 305,090
Securities available for sale, Losses less than 12 months, Gross Unrealized Losses   2,485
Securities available for sale, Losses 12 months or longer, Fair Value 438,339 762,826
Securities available for sale, Losses 12 months or longer, Gross Unrealized Losses 2,236 27,309
Securities available for sale, Total, Fair Value 438,341 1,067,916
Available for sale, Total, Gross Unrealized Losses 2,236 29,794
Commercial Mortgage-Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Securities available for sale, Losses less than 12 months, Fair Value 108,208 96,226
Securities available for sale, Losses less than 12 months, Gross Unrealized Losses 844 1,851
Securities available for sale, Losses 12 months or longer, Fair Value 15,098 570,485
Securities available for sale, Losses 12 months or longer, Gross Unrealized Losses 9 29,085
Securities available for sale, Total, Fair Value 123,306 666,711
Available for sale, Total, Gross Unrealized Losses 853 30,936
Collateralized Mortgage Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Securities available for sale, Losses less than 12 months, Fair Value 613 254
Securities available for sale, Losses less than 12 months, Gross Unrealized Losses   1
Securities available for sale, Losses 12 months or longer, Fair Value 4,091 111,804
Securities available for sale, Losses 12 months or longer, Gross Unrealized Losses 63 2,259
Securities available for sale, Total, Fair Value 4,704 112,058
Available for sale, Total, Gross Unrealized Losses 63 $ 2,260
Other Debt Obligation [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Securities available for sale, Losses less than 12 months, Fair Value 1,903  
Securities available for sale, Losses less than 12 months, Gross Unrealized Losses 54  
Securities available for sale, Total, Fair Value 1,903  
Available for sale, Total, Gross Unrealized Losses $ 54