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Investment Securities - Non-Marketable Securities (Details)
 9 Months Ended
Oct. 21, 2016
$ / shares
Oct. 19, 2016
$ / shares
Sep. 30, 2016
USD ($)
$ / shares
shares
Jul. 28, 2016
Dec. 31, 2015
USD ($)
Schedule of Cost-method Investments [Line Items]          
Federal Home Loan Bank stock, par value (usd per share) | $ / shares     $ 100    
Federal Home Loan Bank, dividend rate percentage       8.94%  
Investments in low income housing tax credit funds     $ 2,500,000   $ 2,700,000
Low income housing tax credits and other tax benefits     223,000    
Low income housing amortization expense     177,000    
Unfunded commitments for low income housing tax credit funds     $ 1,500,000    
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     $ 2,300,000   2,200,000
Visa Inc. | Visa Inc. Class B common stock          
Schedule of Cost-method Investments [Line Items]          
Conversion rate on common stock     1.6483    
Subsequent event          
Schedule of Cost-method Investments [Line Items]          
Special cash dividend declared on capital stock outstanding (usd per share) | $ / shares $ 0.27        
Subsequent event | Federal Home Loan Bank          
Schedule of Cost-method Investments [Line Items]          
Special cash dividend declared on capital stock outstanding (usd per share) | $ / shares   $ 3.41      
Other assets          
Schedule of Cost-method Investments [Line Items]          
Federal Home Loan Bank stock     $ 10,200,000   $ 8,400,000