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Allowance for Loans Losses - Summary of Purchased Loans (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Line Items]    
Purchase loans $ 16,158 $ 19,686
Commercial and Industrial [Member]    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Purchase loans 1,152 1,272
Other Revolving Credit Plans [Member]    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Purchase loans 23 26
Automobile Loans [Member]    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Purchase loans 9 10
Other Consumer Loans [Member]    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Purchase loans 57 63
Construction Loans and All Land Development and Other Land Loans [Member] | Real Estate [Member]    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Purchase loans 917 1,397
Secured by 1-4 Family Residential [Member] | Real Estate [Member]    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Purchase loans 2,770 2,709
Secured by First Liens [Member] | Real Estate [Member]    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Purchase loans 6,240 6,971
Secured by Junior Liens [Member] | Real Estate [Member]    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Purchase loans 175 394
Secured by Multifamily [Member] | Real Estate [Member]    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Purchase loans 61 63
Loans Secured by Owner-Occupied, Nonfarm Nonresidential Properties [Member] | Real Estate [Member]    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Purchase loans 4,210 4,459
Loans Secured by Other Nonfarm Nonresidential Properties [Member] | Real Estate [Member]    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Purchase loans $ 544 $ 2,322