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Loans - Summary of Activities in Allowance for Credit Losses (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Allowance for Loan Losses        
Balance at beginning of year $ 6,775 $ 6,868 $ 6,868  
Provision for loan loss 30 40 324  
Loans charged off (207) (145) (580)  
Recoveries 38 37 163  
Balance at ending of year 6,636   6,775  
Allowance for Unfunded Loan Commitments & Letters of Credit 346   274  
Total Allowance for Credit Losses $ 6,982 $ 7,065 $ 7,049 $ 7,095