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Federal Funds Purchased and Securities Sold Under Agreements to Repurchase - Schedule of Remaining Contractual Maturity in Repurchase Agreements (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Assets Sold under Agreements to Repurchase [Line Items]    
Federal funds purchased $ 0 $ 22,000
Repurchase agreements, Remaining contractual maturity of the agreements 59,000 57,000
Total 59,487 78,815
US Treasury & Agency Securities [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Repurchase agreements, Remaining contractual maturity of the agreements 59,487 56,815
Overnight & Continuous [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Federal funds purchased   22,000
Total 39,077 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 39,077 39,691
Greater Than 90 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Total 20,410 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 $ 20,410 $ 17,124