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Securities (Securities Available for Sale with Unrealized Losses) (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Schedule of Available-for-sale Securities [Line Items]    
Available for sale, Losses less than 12 months, Fair Value $ 559,367 $ 998,312
Available for sale, Losses less than 12 months, Gross Unrealized Losses 1,744 10,661
Available for sale, Losses 12 months or longer, Fair Value 367 599,072
Available for sale, Losses 12 months or longer, Gross Unrealized Losses 2 4,012
Available for sale, Total, Fair Value 559,734 1,597,384
Available for sale, Total, Gross Unrealized Losses 1,746 14,673
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 44,039 28,235
Available for sale, Losses less than 12 months, Gross Unrealized Losses 125 300
Available for sale, Total, Fair Value 44,039 28,235
Available for sale, Total, Gross Unrealized Losses 125 300
Municipal Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale, Losses less than 12 months, Fair Value 26,010  
Available for sale, Losses less than 12 months, Gross Unrealized Losses 347  
Available for sale, Total, Fair Value 26,010  
Available for sale, Total, Gross Unrealized Losses 347  
Residential Mortgage-Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale, Losses less than 12 months, Fair Value 229,662 420,066
Available for sale, Losses less than 12 months, Gross Unrealized Losses 529 5,042
Available for sale, Losses 12 months or longer, Fair Value 367 399,787
Available for sale, Losses 12 months or longer, Gross Unrealized Losses 2 1,978
Available for sale, Total, Fair Value 230,029 819,853
Available for sale, Total, Gross Unrealized Losses 531 7,020
Commercial Mortgage-Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale, Losses less than 12 months, Fair Value 252,858 458,855
Available for sale, Losses less than 12 months, Gross Unrealized Losses 720 3,971
Available for sale, Losses 12 months or longer, Fair Value   14,896
Available for sale, Losses 12 months or longer, Gross Unrealized Losses   207
Available for sale, Total, Fair Value 252,858 473,751
Available for sale, Total, Gross Unrealized Losses 720 4,178
Collateralized Mortgage Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale, Losses less than 12 months, Fair Value 3,300 89,689
Available for sale, Losses less than 12 months, Gross Unrealized Losses 21 1,315
Available for sale, Losses 12 months or longer, Fair Value   184,389
Available for sale, Losses 12 months or longer, Gross Unrealized Losses   1,827
Available for sale, Total, Fair Value 3,300 274,078
Available for sale, Total, Gross Unrealized Losses 21 3,142
Corporate Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale, Losses less than 12 months, Fair Value 3,498 1,467
Available for sale, Losses less than 12 months, Gross Unrealized Losses 2 33
Available for sale, Total, Fair Value 3,498 1,467
Available for sale, Total, Gross Unrealized Losses $ 2 $ 33