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Securities (Securities Available for Sale with Unrealized Losses) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Schedule of Available-for-sale Securities [Line Items]    
Available for sale, Losses less than 12 months, Fair Value $ 514,805 $ 998,312
Available for sale, Losses less than 12 months, Gross Unrealized Losses 3,727 10,661
Available for sale, Losses 12 months or longer, Fair Value 760 599,072
Available for sale, Losses 12 months or longer, Gross Unrealized Losses 6 4,012
Available for sale, Total, Fair Value 515,565 1,597,384
Available for sale, Total, Gross Unrealized Losses 3,733 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 35,845 28,235
Available for sale, Losses less than 12 months, Gross Unrealized Losses 284 300
Available for sale, Total, Fair Value 35,845 28,235
Available for sale, Total, Gross Unrealized Losses 284 300
Municipal Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale, Losses less than 12 months, Fair Value 30,170  
Available for sale, Losses less than 12 months, Gross Unrealized Losses 153  
Available for sale, Total, Fair Value 30,170  
Available for sale, Total, Gross Unrealized Losses 153  
Residential Mortgage-Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale, Losses less than 12 months, Fair Value 530 420,066
Available for sale, Losses less than 12 months, Gross Unrealized Losses 2 5,042
Available for sale, Losses 12 months or longer, Fair Value 760 399,787
Available for sale, Losses 12 months or longer, Gross Unrealized Losses 6 1,978
Available for sale, Total, Fair Value 1,290 819,853
Available for sale, Total, Gross Unrealized Losses 8 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 446,190 458,855
Available for sale, Losses less than 12 months, Gross Unrealized Losses 3,288 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 446,190 473,751
Available for sale, Total, Gross Unrealized Losses 3,288 4,178
Collateralized Mortgage Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale, Losses less than 12 months, Fair Value 70 89,689
Available for sale, Losses less than 12 months, Gross Unrealized Losses   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 70 274,078
Available for sale, Total, Gross Unrealized Losses   3,142
Corporate Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale, Losses less than 12 months, Fair Value 2,000 1,467
Available for sale, Losses less than 12 months, Gross Unrealized Losses   33
Available for sale, Total, Fair Value $ 2,000 1,467
Available for sale, Total, Gross Unrealized Losses   $ 33