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Loans (Narrative) (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
contract
Sep. 30, 2020
contract
Sep. 30, 2021
USD ($)
contract
Sep. 30, 2020
contract
Dec. 31, 2020
USD ($)
Financing Receivable, Credit Quality Indicator - interest written off on nonaccrual loans [Line Items]          
Interest Receivable, loans $ 52,886   $ 52,886   $ 54,831
Financing Receivable Modifications Additional Commitment To Lend $ 1,300   $ 1,300   651
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | contract 0 0 0 0  
Loan modifications, short-term deferments not classified as TDR, Number of contracts | contract     9    
Loan modifications, short-term deferments not classified as TDR, net of unearned income     $ 32,800    
Paycheck Protection Program (PPP) loans, net of unearned income $ 337,000   337,000    
Loans Receivable [Member]          
Financing Receivable, Credit Quality Indicator - interest written off on nonaccrual loans [Line Items]          
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged 3,210,000   3,210,000   3,460,000
Commercial Loan [Member]          
Financing Receivable, Credit Quality Indicator - interest written off on nonaccrual loans [Line Items]          
Loans pledged to collateralize Federal Reserve Bank Borrowings 200,100   200,100   200,400
Loans [Member]          
Financing Receivable, Credit Quality Indicator - interest written off on nonaccrual loans [Line Items]          
Interest Receivable, loans $ 33,000   $ 33,000   $ 37,800