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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, 2021
Dec. 31, 2020
Assets Sold under Agreements to Repurchase [Line Items]    
Repurchase agreements, Remaining contractual maturity of the agreements $ 29,600 $ 30,200
Total 29,601 30,239
Overnight & Continuous [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Total 1,240 1,899
Up to 30 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Total 2,156  
30-90 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Total 750 3,900
Greater Than 90 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Total 25,455 24,440
US Treasury & Agency Securities [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Repurchase agreements, Remaining contractual maturity of the agreements 29,601 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 1,240 1,899
US Treasury & Agency Securities [Member] | Up to 30 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Repurchase agreements, Remaining contractual maturity of the agreements 2,156  
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 750 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 $ 25,455 $ 24,440