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Investment Securities - Non-Marketable Securities (Details)
 6 Months Ended
Jun. 30, 2015
USD ($)
$ / shares
shares
Jul. 28, 2015
Jun. 23, 2015
May. 14, 2015
Dec. 31, 2014
USD ($)
Schedule of Cost-method Investments [Line Items]          
Federal Home Loan Bank stock, par value | $ / shares $ 100        
Federal Home Loan Bank, dividend rate percentage     14.98% 7.67%  
Investments in low income housing tax credit funds $ 2,800,000       $ 1,800,000
Low income housing tax credits and other tax benefits 132,000        
Low income housing amortization expense 102,000        
Unfunded commitments for low income housing tax credit funds $ 2,000,000        
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   10.01%      
Other assets          
Schedule of Cost-method Investments [Line Items]          
Federal Home Loan Bank stock $ 8,400,000       $ 8,200,000