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Components of Other Operating income and Expense (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Other operating income      
Increase in cash value of bank owned life insurance $ 1,690 $ 1,304 $ 1,162
Other [1] 2,439 3,051 4,073
Total other operating income 4,129 4,355 5,235
Other operating expense      
Service fees 3,401 3,856 3,157
OREO expense and net loss 2,438 2,094 2,037
ATM processing expenses 2,407 2,102 1,605
Telephone and data communications 1,595 1,715 1,707
Advertising and public relations 1,309 1,001 1,686
Professional fees 1,272 1,436 2,564
Office supplies 1,228 1,514 1,472
Premises and equipment write-downs 259 935 1,520
Other [1] 7,202 7,589 7,500
Total other operating expense $ 21,111 $ 22,242 $ 23,248
[1] Other components of other operating income or expense that do not exceed 1% of total income.