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Federal Funds Purchased and Securities Sold Under Agreement to Repurchase - Schedule of Remaining Contractual Maturity in Repurchase Agreements and Collateral Pledged (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Assets Sold under Agreements to Repurchase [Line Items]    
Federal funds purchased $ 17,843 $ 6,500
Repurchase agreements, Remaining contractual maturity of the agreements 30,200  
Total 48,073 $ 32,181
US Treasury & Agency Securities [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Repurchase agreements, Remaining contractual maturity of the agreements 30,230  
Overnight & Continuous [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Federal funds purchased 17,843  
Total 19,657  
Overnight & Continuous [Member] | US Treasury & Agency Securities [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Repurchase agreements, Remaining contractual maturity of the agreements 1,814  
30-90 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Total 3,965  
30-90 Days [Member] | US Treasury & Agency Securities [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Repurchase agreements, Remaining contractual maturity of the agreements 3,965  
Greater Than 90 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Total 24,451  
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 $ 24,451