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Loans (Narrative) (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
contract
Jun. 30, 2019
USD ($)
contract
Jun. 30, 2020
USD ($)
contract
Jun. 30, 2019
USD ($)
contract
Dec. 31, 2019
USD ($)
Financing Receivable, Credit Quality Indicator [Line Items]          
Interest Receivable, loans $ 59,149   $ 59,149   $ 46,839
Financing Receivable Accrued Interest Reversed Through Interest Income $ 673 $ 662 $ 1,461 $ 1,288  
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | contract 0 1 0 1  
Short-term loan modifications, payment deferral, COVID-19 response $ 1,580,000        
Paycheck Protection Program (PPP) loans, net of unearned income 941,400   $ 941,400    
Loans Receivable [Member]          
Financing Receivable, Credit Quality Indicator [Line Items]          
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged 3,430,000   3,430,000   3,240,000
Commercial Loan [Member]          
Financing Receivable, Credit Quality Indicator [Line Items]          
Loans pledged to collateralize Federal Reserve Bank Borrowings 199,700   199,700   151,300
Loans [Member]          
Financing Receivable, Credit Quality Indicator [Line Items]          
Interest Receivable, loans 46,500   46,500   $ 33,000
Commercial Portfolio Segment [Member]          
Financing Receivable, Credit Quality Indicator [Line Items]          
Financing Receivable Accrued Interest Reversed Through Interest Income 665 $ 623 1,448 $ 1,168  
Consumer Portfolio Segment [Member]          
Financing Receivable, Credit Quality Indicator [Line Items]          
Financing Receivable Accrued Interest Reversed Through Interest Income $ 8 $ 39 $ 13 $ 120