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Securities Sold Under Agreement to Repurchase - Schedule of Remaining Contractual Maturity in Repurchase Agreements (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Assets Sold under Agreements to Repurchase [Line Items]    
Federal funds purchased $ 22,000  
Repurchase agreements, Remaining contractual maturity of the agreements 56,800  
Total 78,815 $ 55,962
US Treasury & Agency Securities [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Repurchase agreements, Remaining contractual maturity of the agreements 56,815  
Overnight & Continuous [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Federal funds purchased 22,000  
Total 61,691  
Overnight & Continuous [Member] | US Treasury & Agency Securities [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Repurchase agreements, Remaining contractual maturity of the agreements 39,691  
Greater Than 90 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Total 17,124  
Greater Than 90 Days [Member] | US Treasury & Agency Securities [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Repurchase agreements, Remaining contractual maturity of the agreements $ 17,124