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Securities (Securities Available for Sale with Unrealized Losses) (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Schedule of Available-for-sale Securities [Line Items]    
Available for sale, Losses less than 12 months, Fair Value $ 3,199,833 $ 514,805
Available for sale, Losses less than 12 months, Gross Unrealized Losses 69,992 3,727
Available for sale, Losses 12 months or longer, Fair Value 353,408 760
Available for sale, Losses 12 months or longer, Gross Unrealized Losses 16,111 6
Available for sale, Total, Fair Value 3,553,241 515,565
Available for sale, Total, Gross Unrealized Losses 86,103 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 199,451 35,845
Available for sale, Losses less than 12 months, Gross Unrealized Losses 2,712 284
Available for sale, Losses 12 months or longer, Fair Value 32,489  
Available for sale, Losses 12 months or longer, Gross Unrealized Losses 1,457  
Available for sale, Total, Fair Value 231,940 35,845
Available for sale, Total, Gross Unrealized Losses 4,169 284
Municipal Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale, Losses less than 12 months, Fair Value 43,297 30,170
Available for sale, Losses less than 12 months, Gross Unrealized Losses 2,098 153
Available for sale, Losses 12 months or longer, Fair Value 25,243  
Available for sale, Losses 12 months or longer, Gross Unrealized Losses 1,080  
Available for sale, Total, Fair Value 68,540 30,170
Available for sale, Total, Gross Unrealized Losses 3,178 153
Residential Mortgage-Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale, Losses less than 12 months, Fair Value 2,097,625 530
Available for sale, Losses less than 12 months, Gross Unrealized Losses 42,984 2
Available for sale, Losses 12 months or longer, Fair Value 704 760
Available for sale, Losses 12 months or longer, Gross Unrealized Losses 4 6
Available for sale, Total, Fair Value 2,098,329 1,290
Available for sale, Total, Gross Unrealized Losses 42,988 8
Commercial Mortgage-Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale, Losses less than 12 months, Fair Value 856,462 446,190
Available for sale, Losses less than 12 months, Gross Unrealized Losses 22,196 3,288
Available for sale, Losses 12 months or longer, Fair Value 294,972  
Available for sale, Losses 12 months or longer, Gross Unrealized Losses 13,570  
Available for sale, Total, Fair Value 1,151,434 446,190
Available for sale, Total, Gross Unrealized Losses 35,766 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 2,998 2,000
Available for sale, Losses less than 12 months, Gross Unrealized Losses 2  
Available for sale, Total, Fair Value 2,998 $ 2,000
Available for sale, Total, Gross Unrealized Losses $ 2