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Federal Funds Purchased and Securities Sold Under Agreement to Repurchase - Schedule of Remaining Contractual Maturity in Repurchase Agreements (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Assets Sold under Agreements to Repurchase [Line Items]    
Federal funds purchased $ 0 $ 10,425
Repurchase agreements, Remaining contractual maturity of the agreements 23,300 29,100
Total 23,307 39,495
US Treasury & Agency Securities [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Repurchase agreements, Remaining contractual maturity of the agreements 23,307 29,070
Overnight & Continuous [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Federal funds purchased   10,425
Total 271 16,570
Overnight & Continuous [Member] | US Treasury & Agency Securities [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Repurchase agreements, Remaining contractual maturity of the agreements 271 6,145
Greater Than 90 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Total 23,036 22,925
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 $ 23,036 $ 22,925