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Investment Securities - Non-Marketable Securities (Details)
 9 Months Ended
Sep. 30, 2015
USD ($)
$ / shares
shares
Oct. 28, 2015
Dec. 31, 2014
USD ($)
Schedule of Cost-method Investments [Line Items]      
Federal Home Loan Bank stock, par value | $ / shares $ 100    
Investments in low income housing tax credit funds $ 2,700,000   $ 1,800,000
Low income housing tax credits and other tax benefits 169,000    
Low income housing amortization expense 131,000    
Unfunded commitments for low income housing tax credit funds $ 1,800,000    
Visa Inc. | Visa Inc. Class B common stock      
Schedule of Cost-method Investments [Line Items]      
Stockholders' Equity Note, Stock Split, Conversion Ratio 1.6483    
Visa Inc. Class B common stock      
Schedule of Cost-method Investments [Line Items]      
Number of shares of securities carried at cost | shares 16,939    
Carrying value of securities carried at cost $ 0    
Fair value of Class B common stock 1,900,000   1,800,000
Subsequent event      
Schedule of Cost-method Investments [Line Items]      
Federal Home Loan Bank, dividend rate percentage   8.79%  
Other assets      
Schedule of Cost-method Investments [Line Items]      
Federal Home Loan Bank stock $ 8,400,000   $ 8,200,000