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Loans - Troubled Debt Restructuring and Loans Accounted for Under ASC Topic 310-30 Narratives (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
item
Jun. 30, 2016
USD ($)
item
loan
Jun. 30, 2015
loan
Dec. 31, 2015
USD ($)
Debt Instrument [Line Items]        
TDR's modified within the past year that defaulted on their restructured terms | item   5    
Troubled Debt Restructurings [Member]        
Debt Instrument [Line Items]        
TDR's modified within the past year that defaulted on their restructured terms 1   0  
Number of restructured loans | item   12    
Recorded investment $ 2,700 $ 2,700    
Energy Loans [Member]        
Debt Instrument [Line Items]        
TDR's modified within the past year that defaulted on their restructured terms | loan   1    
Financing Receivable, Modifications, Subsequent Default, Recorded Investment   $ 5,800    
Financing Receivable, Modifications, Subsequent Default, Recorded Investment   $ 5,800    
Commercial Loan [Member]        
Debt Instrument [Line Items]        
TDR's modified within the past year that defaulted on their restructured terms | loan   2    
Financing Receivable, Modifications, Subsequent Default, Recorded Investment   $ 3,900    
Financing Receivable, Modifications, Subsequent Default, Recorded Investment   $ 3,900    
Residential [Member]        
Debt Instrument [Line Items]        
TDR's modified within the past year that defaulted on their restructured terms | loan   1    
Financing Receivable, Modifications, Subsequent Default, Recorded Investment   $ 100    
Financing Receivable, Modifications, Subsequent Default, Recorded Investment   $ 100    
Total Commercial Real Estate [Member]        
Debt Instrument [Line Items]        
TDR's modified within the past year that defaulted on their restructured terms | loan   1    
Financing Receivable, Modifications, Subsequent Default, Recorded Investment   $ 200    
Financing Receivable, Modifications, Subsequent Default, Recorded Investment   200    
Accruing TDR [Member]        
Debt Instrument [Line Items]        
Recorded investment 5,729 5,729   $ 8,436
Non-Accruing TDR [Member]        
Debt Instrument [Line Items]        
Troubled Debt Restructuring Nonaccrual Loans $ 13,051 $ 13,051   $ 17,793