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Loans (Narrative) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
contract
Dec. 31, 2019
USD ($)
contract
Dec. 31, 2018
contract
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Accrued Interest Receivable for Loans   $ 46,839  
Financing Receivable Modifications Additional Commitment To Lend $ 651 $ 1,100  
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | contract 0 1 0
Financing Receivable, Troubled Debt Restructuring, Subsequent Default   $ 26  
Loan modifications, short-term deferments not classified as TDR, Number of contracts | contract 70    
Loan modifications, short-term deferments not classified as TDR, net of unearned income $ 146,700    
Paycheck Protection Program (PPP) loans, net of unearned income 651,600    
Loans Receivable      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans pledged to collateralize Federal Home Loan Bank Advances 3,460,000 3,240,000  
Commercial Loan      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans pledged to collateralize Federal Reserve Bank Borrowings 200,400 151,300  
Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Accrued Interest Receivable for Loans $ 37,800 $ 33,000