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Loans - Summary of Activities in Allowance for Credit Losses (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Allowance for Loan Losses                      
Balance at beginning of year       $ 5,905       $ 5,194 $ 5,905 $ 5,194 $ 5,224
Provision for loan loss $ 85 $ 243 $ 183 $ 114 $ 37 $ 282 $ 444 $ 428 625 1,191 858
Loans charged off                 (1,030) (778) (1,262)
Recoveries                 557 298 374
Balance at ending of year 6,057       5,905       6,057 5,905 5,194
Allowance for Unfunded Loan Commitments & Letters of Credit 208       207       208 207 163
Total Allowance for Credit Losses $ 6,265       $ 6,112       $ 6,265 $ 6,112 $ 5,357