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Loans and Allowance for Credit Losses - Troubled Debt Restructurings (Details)
number in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
Loans
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
Loans
Sep. 30, 2014
USD ($)
Loans
Dec. 31, 2014
USD ($)
Financing Receivable, Modifications [Line Items]          
Outstanding Recorded Investment $ 5,676   $ 5,676   $ 6,600
Reserves specific to modified loans $ 6   $ 6   $ 132
Defaults on troubled debt restructurings 0 0 0 0  
Loans and Leases Receivable, Impaired, Commitment to Lend $ 0   $ 0    
Commercial and industrial          
Financing Receivable, Modifications [Line Items]          
Number of Loans | Loans     2    
Pre-Modification Outstanding Recorded Investment     $ 42    
Principal Modification     0    
Post Modification Outstanding Recorded Investment     42    
Outstanding Recorded Investment $ 34   $ 34    
Equity loans and lines of credit          
Financing Receivable, Modifications [Line Items]          
Number of Loans | Loans       1  
Pre-Modification Outstanding Recorded Investment       $ 7  
Principal Modification       0  
Post Modification Outstanding Recorded Investment       7  
Outstanding Recorded Investment   $ 4   $ 4