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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
Mar. 31, 2017
Dec. 31, 2016
Assets Sold under Agreements to Repurchase [Line Items]    
Federal funds purchased $ 0 $ 17,000
Repurchase agreements, Remaining contractual maturity of the agreements 28,000 53,000
Total 27,961 70,324
US Treasury & Agency Securities [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Repurchase agreements, Remaining contractual maturity of the agreements 27,961 53,324
Overnight & Continuous [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Federal funds purchased   17,000
Total 7,352 49,814
Overnight & Continuous [Member] | US Treasury & Agency Securities [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Repurchase agreements, Remaining contractual maturity of the agreements 7,352 32,814
Greater Than 90 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Total 20,609 20,510
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 $ 20,609 $ 20,510