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Investment Securities - Non-Marketable Securities (Details)
 3 Months Ended
Mar. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
Jul. 28, 2016
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     7.00%
Investments in low income housing tax credit funds $ 2,400,000 $ 2,500,000  
Low income housing tax credits and other tax benefits 87,000    
Low income housing amortization expense 70,000    
Unfunded commitments for low income housing tax credit funds $ 1,100,000    
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 $ 2,500,000 $ 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    
Other assets      
Schedule of Cost-method Investments [Line Items]      
Federal Home Loan Bank stock $ 10,200,000