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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, 2021
Dec. 31, 2020
Assets Sold under Agreements to Repurchase [Line Items]    
Repurchase agreements, Remaining contractual maturity of the agreements $ 30,100 $ 30,200
Total 30,072 30,239
Overnight & Continuous [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Total 1,732 1,899
30-90 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Total   3,900
Greater Than 90 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Total 28,340 24,440
US Treasury & Agency Securities [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Repurchase agreements, Remaining contractual maturity of the agreements 30,072 30,239
US Treasury & Agency Securities [Member] | Overnight & Continuous [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Repurchase agreements, Remaining contractual maturity of the agreements 1,732 1,899
US Treasury & Agency Securities [Member] | 30-90 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Repurchase agreements, Remaining contractual maturity of the agreements   3,900
US Treasury & Agency Securities [Member] | Greater Than 90 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Repurchase agreements, Remaining contractual maturity of the agreements $ 28,340 $ 24,440