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Fair Value Measurements - Level 3 Inputs (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Level 3    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Loans receivable $ 585,211 $ 564,667
Fair Value    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Loans receivable 585,211 564,667
Nonrecurring | Level 3 | Commercial and industrial | Impaired loans    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Loans receivable $ 11 $ 7,019
Management adjustments for depreciation in values depending on property types (percent) 27.00%  
Nonrecurring | Level 3 | Commercial and industrial | Impaired loans | Minimum    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Appraiser adjustments on sales comparable data (percent) 3.00% 0.00%
Management adjustments for depreciation in values depending on property types (percent)   8.00%
Nonrecurring | Level 3 | Commercial and industrial | Impaired loans | Maximum    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Appraiser adjustments on sales comparable data (percent) 18.00% 6.00%
Management adjustments for depreciation in values depending on property types (percent)   25.00%
Nonrecurring | Level 3 | Equity loans and lines of credit | Impaired loans    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Loans receivable $ 142 $ 777
Management adjustments for depreciation in values depending on property types (percent) 15.00% 11.00%
Nonrecurring | Level 3 | Equity loans and lines of credit | Impaired loans | Minimum    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Appraiser adjustments on sales comparable data (percent) 10.00% 0.00%
Nonrecurring | Level 3 | Equity loans and lines of credit | Impaired loans | Maximum    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Appraiser adjustments on sales comparable data (percent) 18.00% 4.00%
Nonrecurring | Level 3 | Other real estate owned | Impaired loans | Minimum    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
External appraised values, management assumptions regarding market trends or relevant factors less estimated selling costs (percent) 6.00%  
Nonrecurring | Level 3 | Other real estate owned | Impaired loans | Maximum    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
External appraised values, management assumptions regarding market trends or relevant factors less estimated selling costs (percent) 8.00%