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Loans (Narrative) (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
contract
Jun. 30, 2016
contract
Jun. 30, 2017
USD ($)
contract
Jun. 30, 2016
contract
Dec. 31, 2016
USD ($)
Financing Receivable, Recorded Investment [Line Items]          
Loans to related parties $ 10,100   $ 10,100   $ 10,100
Loans and Leases Receivable, Related Parties, Additions     203    
Repayments on related party loans     $ 200    
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | contract 0 0 0 0  
Loans Receivable [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged $ 2,280,000   $ 2,280,000   2,290,000
Federal Reserve Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged $ 70,100   $ 70,100   $ 54,200