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Allowance for Loan Losses - Summary of Impaired Loans Average Recorded Investment and Interest Income Recognized (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Total real estate loans    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance - Average recorded investment $ 4,882 $ 5,549
Impaired loans with no related allowance - Interest income recognized 0 0
Impaired loans with an allowance - Average recorded investment 402 1,221
Impaired loans with an allowance - Interest income recognized 0 0
Commercial real estate    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance - Average recorded investment 3,534 3,723
Impaired loans with no related allowance - Interest income recognized 0 0
Impaired loans with an allowance - Average recorded investment 336 630
Impaired loans with an allowance - Interest income recognized 0 0
Owner-occupied commercial real estate    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance - Average recorded investment 0 0
Impaired loans with no related allowance - Interest income recognized 0 0
Impaired loans with an allowance - Average recorded investment 0 0
Impaired loans with an allowance - Interest income recognized 0 0
1-4 single family residential    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance - Average recorded investment 790 790
Impaired loans with no related allowance - Interest income recognized 0 0
Impaired loans with an allowance - Average recorded investment 0 525
Impaired loans with an allowance - Interest income recognized 0 0
Construction, land and development    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance - Average recorded investment 0 0
Impaired loans with no related allowance - Interest income recognized 0 0
Impaired loans with an allowance - Average recorded investment 0 0
Impaired loans with an allowance - Interest income recognized 0 0
Home equity loans and lines of credit    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance - Average recorded investment 558 1,036
Impaired loans with no related allowance - Interest income recognized 0 0
Impaired loans with an allowance - Average recorded investment 66 66
Impaired loans with an allowance - Interest income recognized 0 0
Total other loans    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance - Average recorded investment 0 0
Impaired loans with no related allowance - Interest income recognized 0 0
Impaired loans with an allowance - Average recorded investment 272 375
Impaired loans with an allowance - Interest income recognized 0 0
Commercial and industrial    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance - Average recorded investment 0 0
Impaired loans with no related allowance - Interest income recognized 0 0
Impaired loans with an allowance - Average recorded investment 272 375
Impaired loans with an allowance - Interest income recognized 0 0
Consumer    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance - Average recorded investment 0 0
Impaired loans with no related allowance - Interest income recognized 0 0
Impaired loans with an allowance - Average recorded investment 0 0
Impaired loans with an allowance - Interest income recognized $ 0 $ 0