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Deposit and Loan Activity with Related Parties (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Related Party Transaction [Line Items]      
Beginning balance $ 3,820 $ 2,922 $ 2,589
Increase in deposits, including new accounts 971 1,321 907
Decrease in deposits, including closed accounts (1,022) (423) (574)
Net change in deposits (51) 898 333
Ending balance 3,769 3,820 2,922
Beginning balance 22,826 17,181 16,617
Increase in existing loans, including new loans 1,066 6,123 2,037
Decrease in existing loans, including loans paid off (2,006) (478) (1,473)
Net change in loans (940) 5,645 564
Ending balance $ 21,886 $ 22,826 $ 17,181