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Securities (Securities Available for Sale with Unrealized Losses) (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Schedule of Available-for-sale Securities [Line Items]    
Available for sale, Losses less than 12 months, Fair Value $ 25,105 $ 442,773
Available for sale, Losses less than 12 months, Gross Unrealized Losses 15 4,928
Available for sale, Losses 12 months or longer, Fair Value 1,135,952 1,687,704
Available for sale, Losses 12 months or longer, Gross Unrealized Losses 9,571 67,340
Available for sale, Total, Fair Value 1,161,057 2,130,477
Available for sale, Total, Gross Unrealized Losses 9,586 72,268
U.S. Treasury And Government Agency Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale, Losses 12 months or longer, Fair Value 21,215 71,706
Available for sale, Losses 12 months or longer, Gross Unrealized Losses 149 2,633
Available for sale, Total, Fair Value 21,215 71,706
Available for sale, Total, Gross Unrealized Losses 149 2,633
Municipal Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale, Losses less than 12 months, Fair Value 2,292 41,203
Available for sale, Losses less than 12 months, Gross Unrealized Losses 3 591
Available for sale, Losses 12 months or longer, Fair Value   170,883
Available for sale, Losses 12 months or longer, Gross Unrealized Losses   6,054
Available for sale, Total, Fair Value 2,292 212,086
Available for sale, Total, Gross Unrealized Losses 3 6,645
Residential Mortgage-Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale, Losses less than 12 months, Fair Value 1 305,090
Available for sale, Losses less than 12 months, Gross Unrealized Losses   2,485
Available for sale, Losses 12 months or longer, Fair Value 689,726 762,826
Available for sale, Losses 12 months or longer, Gross Unrealized Losses 6,776 27,309
Available for sale, Total, Fair Value 689,727 1,067,916
Available for sale, Total, Gross Unrealized Losses 6,776 29,794
Commercial Mortgage-Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale, Losses less than 12 months, Fair Value 22,112 96,226
Available for sale, Losses less than 12 months, Gross Unrealized Losses 12 1,851
Available for sale, Losses 12 months or longer, Fair Value 367,211 570,485
Available for sale, Losses 12 months or longer, Gross Unrealized Losses 2,368 29,085
Available for sale, Total, Fair Value 389,323 666,711
Available for sale, Total, Gross Unrealized Losses 2,380 30,936
Collateralized Mortgage Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale, Losses less than 12 months, Fair Value   254
Available for sale, Losses less than 12 months, Gross Unrealized Losses   1
Available for sale, Losses 12 months or longer, Fair Value 57,800 111,804
Available for sale, Losses 12 months or longer, Gross Unrealized Losses 278 2,259
Available for sale, Total, Fair Value 57,800 112,058
Available for sale, Total, Gross Unrealized Losses 278 $ 2,260
Other Debt Obligation [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale, Losses less than 12 months, Fair Value 700  
Available for sale, Total, Fair Value $ 700