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Securities (Securities Available for Sale with Unrealized Losses) (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Schedule of Available-for-sale Securities [Line Items]    
Available for sale, Losses less than 12 months, Fair Value $ 50,030 $ 998,312
Available for sale, Losses less than 12 months, Gross Unrealized Losses 144 10,661
Available for sale, Losses 12 months or longer, Fair Value 542 599,072
Available for sale, Losses 12 months or longer, Gross Unrealized Losses 3 4,012
Available for sale, Total, Fair Value 50,572 1,597,384
Available for sale, Total, Gross Unrealized Losses 147 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   28,235
Available for sale, Losses less than 12 months, Gross Unrealized Losses   300
Available for sale, Total, Fair Value   28,235
Available for sale, Total, Gross Unrealized Losses   300
Residential Mortgage-Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale, Losses less than 12 months, Fair Value 2,096 420,066
Available for sale, Losses less than 12 months, Gross Unrealized Losses 10 5,042
Available for sale, Losses 12 months or longer, Fair Value 542 399,787
Available for sale, Losses 12 months or longer, Gross Unrealized Losses 3 1,978
Available for sale, Total, Fair Value 2,638 819,853
Available for sale, Total, Gross Unrealized Losses 13 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   458,855
Available for sale, Losses less than 12 months, Gross Unrealized Losses   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   473,751
Available for sale, Total, Gross Unrealized Losses   4,178
Collateralized Mortgage Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale, Losses less than 12 months, Fair Value 47,153 89,689
Available for sale, Losses less than 12 months, Gross Unrealized Losses 115 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 47,153 274,078
Available for sale, Total, Gross Unrealized Losses 115 3,142
Corporate Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale, Losses less than 12 months, Fair Value 781 1,467
Available for sale, Losses less than 12 months, Gross Unrealized Losses 19 33
Available for sale, Total, Fair Value 781 1,467
Available for sale, Total, Gross Unrealized Losses $ 19 $ 33