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Loans (Narrative) (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2020
USD ($)
contract
Mar. 31, 2019
USD ($)
contract
Dec. 31, 2019
USD ($)
Financing Receivable, Credit Quality Indicator [Line Items]      
Interest Receivable, loans $ 44,577   $ 46,839
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | contract 0 1  
Short-term loan modifications, payment deferral, COVID-19 response $ 165,100    
Loans Receivable [Member]      
Financing Receivable, Credit Quality Indicator [Line Items]      
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged 3,370,000   3,240,000
Commercial Loan [Member]      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans pledged to collateralize Federal Reserve Bank Borrowings 149,900   151,300
Loans [Member]      
Financing Receivable, Credit Quality Indicator [Line Items]      
Interest Receivable, loans 32,300   $ 33,000
Commercial Portfolio Segment [Member]      
Financing Receivable, Credit Quality Indicator [Line Items]      
Financing Receivable Accrued Interest Reversed Through Interest Income 783 $ 539  
Consumer Portfolio Segment [Member]      
Financing Receivable, Credit Quality Indicator [Line Items]      
Financing Receivable Accrued Interest Reversed Through Interest Income $ 5 $ 79