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Securities (Securities Available for Sale with Unrealized Losses) (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Schedule of Available-for-sale Securities [Line Items]    
Available for sale, Losses less than 12 months, Fair Value $ 2,998,375 $ 514,805
Available for sale, Losses less than 12 months, Gross Unrealized Losses 57,329 3,727
Available for sale, Losses 12 months or longer, Fair Value 719 760
Available for sale, Losses 12 months or longer, Gross Unrealized Losses 4 6
Available for sale, Total, Fair Value 2,999,094 515,565
Available for sale, Total, Gross Unrealized Losses 57,333 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 108,890 35,845
Available for sale, Losses less than 12 months, Gross Unrealized Losses 1,046 284
Available for sale, Total, Fair Value 108,890 35,845
Available for sale, Total, Gross Unrealized Losses 1,046 284
Municipal Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale, Losses less than 12 months, Fair Value 69,307 30,170
Available for sale, Losses less than 12 months, Gross Unrealized Losses 2,420 153
Available for sale, Total, Fair Value 69,307 30,170
Available for sale, Total, Gross Unrealized Losses 2,420 153
Residential Mortgage-Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale, Losses less than 12 months, Fair Value 1,739,131 530
Available for sale, Losses less than 12 months, Gross Unrealized Losses 30,534 2
Available for sale, Losses 12 months or longer, Fair Value 719 760
Available for sale, Losses 12 months or longer, Gross Unrealized Losses 4 6
Available for sale, Total, Fair Value 1,739,850 1,290
Available for sale, Total, Gross Unrealized Losses 30,538 8
Commercial Mortgage-Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale, Losses less than 12 months, Fair Value 1,079,547 446,190
Available for sale, Losses less than 12 months, Gross Unrealized Losses 23,329 3,288
Available for sale, Total, Fair Value 1,079,547 446,190
Available for sale, Total, Gross Unrealized Losses 23,329 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 1,500 2,000
Available for sale, Total, Fair Value $ 1,500 $ 2,000