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Securities (Securities Available for Sale with Unrealized Losses) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Schedule of Available-for-sale Securities [Line Items]    
Available for sale, Losses less than 12 months, Fair Value $ 34,495 $ 998,312
Available for sale, Losses less than 12 months, Gross Unrealized Losses 355 10,661
Available for sale, Losses 12 months or longer, Fair Value 1,688 599,072
Available for sale, Losses 12 months or longer, Gross Unrealized Losses 5 4,012
Available for sale, Total, Fair Value 36,183 1,597,384
Available for sale, Total, Gross Unrealized Losses 360 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 7,807 28,235
Available for sale, Losses less than 12 months, Gross Unrealized Losses 223 300
Available for sale, Total, Fair Value 7,807 28,235
Available for sale, Total, Gross Unrealized Losses 223 300
Residential Mortgage-Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale, Losses less than 12 months, Fair Value 714 420,066
Available for sale, Losses less than 12 months, Gross Unrealized Losses 5 5,042
Available for sale, Losses 12 months or longer, Fair Value 1,688 399,787
Available for sale, Losses 12 months or longer, Gross Unrealized Losses 5 1,978
Available for sale, Total, Fair Value 2,402 819,853
Available for sale, Total, Gross Unrealized Losses 10 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 25,196 458,855
Available for sale, Losses less than 12 months, Gross Unrealized Losses 105 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 25,196 473,751
Available for sale, Total, Gross Unrealized Losses 105 4,178
Collateralized Mortgage Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale, Losses less than 12 months, Fair Value   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   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 778 1,467
Available for sale, Losses less than 12 months, Gross Unrealized Losses 22 33
Available for sale, Total, Fair Value 778 1,467
Available for sale, Total, Gross Unrealized Losses $ 22 $ 33