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Loans (Narrative) (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
contract
Sep. 30, 2017
contract
Sep. 30, 2018
USD ($)
contract
Sep. 30, 2017
contract
Dec. 31, 2017
USD ($)
Financing Receivable, Recorded Investment [Line Items]          
Loans to related parties $ 9,700   $ 9,700   $ 10,000
Loans and Leases Receivable, Related Parties, Additions     14    
Repayments on related party loans     $ 226    
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 $ 3,180,000   $ 3,180,000   2,250,000
Federal Reserve Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged $ 76,200   $ 76,200   $ 70,200