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Securities (Securities Available for Sale with Unrealized Losses) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Schedule of Available-for-sale Securities [Line Items]    
Available for sale, Losses less than 12 months, Fair Value $ 998,312 $ 442,773
Available for sale, Losses less than 12 months, Gross Unrealized Losses 10,661 4,928
Available for sale, Losses 12 months or longer, Fair Value 599,072 1,687,704
Available for sale, Losses 12 months or longer, Gross Unrealized Losses 4,012 67,340
Available for sale, Total, Fair Value 1,597,384 2,130,477
Available for sale, Total, Gross Unrealized Losses 14,673 72,268
U.S. Treasury And Government Agency Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale, Losses less than 12 months, Fair Value 28,235  
Available for sale, Losses less than 12 months, Gross Unrealized Losses 300  
Available for sale, Losses 12 months or longer, Fair Value   71,706
Available for sale, Losses 12 months or longer, Gross Unrealized Losses   2,633
Available for sale, Total, Fair Value 28,235 71,706
Available for sale, Total, Gross Unrealized Losses 300 2,633
Municipal Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale, Losses less than 12 months, Fair Value   41,203
Available for sale, Losses less than 12 months, Gross Unrealized Losses   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   212,086
Available for sale, Total, Gross Unrealized Losses   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 420,066 305,090
Available for sale, Losses less than 12 months, Gross Unrealized Losses 5,042 2,485
Available for sale, Losses 12 months or longer, Fair Value 399,787 762,826
Available for sale, Losses 12 months or longer, Gross Unrealized Losses 1,978 27,309
Available for sale, Total, Fair Value 819,853 1,067,916
Available for sale, Total, Gross Unrealized Losses 7,020 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 458,855 96,226
Available for sale, Losses less than 12 months, Gross Unrealized Losses 3,971 1,851
Available for sale, Losses 12 months or longer, Fair Value 14,896 570,485
Available for sale, Losses 12 months or longer, Gross Unrealized Losses 207 29,085
Available for sale, Total, Fair Value 473,751 666,711
Available for sale, Total, Gross Unrealized Losses 4,178 30,936
Collateralized Mortgage Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale, Losses less than 12 months, Fair Value 89,689 254
Available for sale, Losses less than 12 months, Gross Unrealized Losses 1,315 1
Available for sale, Losses 12 months or longer, Fair Value 184,389 111,804
Available for sale, Losses 12 months or longer, Gross Unrealized Losses 1,827 2,259
Available for sale, Total, Fair Value 274,078 112,058
Available for sale, Total, Gross Unrealized Losses 3,142 $ 2,260
Corporate Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale, Losses less than 12 months, Fair Value 1,467  
Available for sale, Losses less than 12 months, Gross Unrealized Losses 33  
Available for sale, Total, Fair Value 1,467  
Available for sale, Total, Gross Unrealized Losses $ 33