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Securities (Securities Available for Sale with Unrealized Losses) (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Schedule of Available-for-sale Securities [Line Items]    
Available for sale, Losses less than 12 months, Fair Value $ 3,108,701 $ 514,805
Available for sale, Losses less than 12 months, Gross Unrealized Losses 126,516 3,727
Available for sale, Losses 12 months or longer, Fair Value 728 760
Available for sale, Losses 12 months or longer, Gross Unrealized Losses 4 6
Available for sale, Total, Fair Value 3,109,429 515,565
Available for sale, Total, Gross Unrealized Losses 126,520 3,733
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 125,672 35,845
Available for sale, Losses less than 12 months, Gross Unrealized Losses 4,554 284
Available for sale, Total, Fair Value 125,672 35,845
Available for sale, Total, Gross Unrealized Losses 4,554 284
Municipal Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale, Losses less than 12 months, Fair Value 66,344 30,170
Available for sale, Losses less than 12 months, Gross Unrealized Losses 5,393 153
Available for sale, Total, Fair Value 66,344 30,170
Available for sale, Total, Gross Unrealized Losses 5,393 153
Residential Mortgage-Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale, Losses less than 12 months, Fair Value 1,669,212 530
Available for sale, Losses less than 12 months, Gross Unrealized Losses 51,668 2
Available for sale, Losses 12 months or longer, Fair Value 728 760
Available for sale, Losses 12 months or longer, Gross Unrealized Losses 4 6
Available for sale, Total, Fair Value 1,669,940 1,290
Available for sale, Total, Gross Unrealized Losses 51,672 8
Commercial Mortgage-Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale, Losses less than 12 months, Fair Value 1,247,473 446,190
Available for sale, Losses less than 12 months, Gross Unrealized Losses 64,901 3,288
Available for sale, Total, Fair Value 1,247,473 446,190
Available for sale, Total, Gross Unrealized Losses $ 64,901 3,288
Collateralized Mortgage Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale, Losses less than 12 months, Fair Value   70
Available for sale, Total, Fair Value   70
Corporate Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale, Losses less than 12 months, Fair Value   2,000
Available for sale, Total, Fair Value   $ 2,000