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Commitments - Summary of Outstanding Commitments to Originate Loans and to Advance Additional Amounts (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Standby letters of credit    
Other Commitments [Line Items]    
Contract Amount $ 6,098 $ 4,288
Available portion of lines of credit    
Other Commitments [Line Items]    
Contract Amount 247,670 186,446
Undisbursed portion of loans in process    
Other Commitments [Line Items]    
Contract Amount 111,466 108,307
Commitments to originate loans    
Other Commitments [Line Items]    
Contract Amount $ 87,446 $ 92,656