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Investment Securities - Non-Marketable Securities (Details)
 6 Months Ended
Jun. 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 | $ / shares $ 100    
Investments in low income housing tax credit funds $ 2,600,000   $ 2,700,000
Low income housing tax credits and other tax benefits 164,000    
Low income housing amortization expense 127,000    
Unfunded commitments for low income housing tax credit funds $ 1,500,000    
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 2,100,000   2,200,000
Other assets      
Schedule of Cost-method Investments [Line Items]      
Federal Home Loan Bank stock $ 10,200,000   $ 8,400,000
Subsequent event      
Schedule of Cost-method Investments [Line Items]      
Federal Home Loan Bank, dividend rate percentage   9.17%