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Loans - Narrative (Details)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
USD ($)
loan
Sep. 30, 2014
USD ($)
loan
Sep. 30, 2015
USD ($)
loan
Sep. 30, 2014
USD ($)
loan
Dec. 31, 2014
USD ($)
loan
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing Receivable, Modifications, Number of Contracts     88 96 94
Financing Receivable, Modifications, Recorded Investment | $ $ 24,715 $ 27,877 $ 24,715 $ 27,877 $ 27,214
Financing Receivable Modifications Number Of Contracts Greater Than 30 Days Past Due Place In T D R In Previous 12 Months 10 11 10 11  
Financing Receivable Recorded Investment Greater Than30 Days Past Due | $ $ 1,593 $ 1,987 $ 1,593 $ 1,987  
Financing Receivable, Number Of Loans Classified As Troubled Debt Restructurings That Had Been Placed On TDR Status In Previous 12 Months   3   3  
Loans classified as TDR in last 12 months | $   $ 416   $ 416  
Financing Receivable Modifications Number Of Contracts During Period 1 3 1 6  
Financing Receivable Modifications Post Modification Recorded Investment During Period | $ $ 108 $ 545 $ 108 $ 832  
Financing Receivable, Number Of Loans Classified As Troubled Debt Restructurings That Are Involved In Bankruptcy 8   8    
Financing Receivable, Loans Classified As Troubled Debt Restructurings That Are Involved In Bankruptcy | $ $ 1,153   $ 1,153    
Financing Receivable Number Of Loans Classified As Troubled Debt Restructurings That Were On Non Accrual Status 14   14    
Financing Receivable, Number of Loans Classified As Troubled Debt Restructurings Classified As NonAccrual | $ $ 1,913   $ 1,913    
Financing Receivable, Number Of Loans Classified As Troubled Debt Restructurings Involved In Foreclosure 3   3    
Loans Classified As Troubled Debt Restructurings That Are Involved In Foreclosure | $ $ 265   $ 265    
Mortgage Loans in Process of Foreclosure, Number 18   18    
Mortgage Loans in Process of Foreclosure, Amount | $ $ 2,038   $ 2,038    
Unallocated          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Number Of Days Past Due 30 days 30 days