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Investment Securities - Additional Information (Details)
3 Months Ended
May 12, 2017
USD ($)
Mar. 31, 2017
USD ($)
security
Mar. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
security
Schedule Of Available For Sale Securities [Line Items]        
Securities pledged, carrying amount   $ 401,409,000   $ 390,814,000
Recognized gains on early call of available-for-sale securities   $ 1,000    
Sale of available-for-sale securities     $ 102,263,000  
Number of securities in securities portfolio | security   335   329
Number of securities in securities portfolio, unrealized loss position | security   143   151
Other-than-temporary impairment recorded by the company   $ 0 $ 0  
Subsequent Event        
Schedule Of Available For Sale Securities [Line Items]        
Sale of available-for-sale securities $ 12,135,000      
Recognized gain on available-for-sale securities $ 23,000