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Components of Accumulated Other Comprehensive Income, Net of Tax (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance     $ 343,017 $ 351,374
Other comprehensive income (loss) before reclassifications $ 2,619 $ (1,525) 2,089 (576)
Reclassified from AOCI 97 (82) 141 (17)
Net comprehensive (loss) income 2,716 (1,607) 2,230 (593)
Balance 334,212 344,568 334,212 344,568
Available-for-Sale Securities        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance (4,337) (3,241) (3,885) (4,266)
Other comprehensive income (loss) before reclassifications 2,575 (1,525) 2,123 (514)
Reclassified from AOCI 56 (133) 56 (119)
Net comprehensive (loss) income 2,631 (1,658) 2,179 (633)
Balance (1,706) (4,899) (1,706) (4,899)
Employee Benefit Plan        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance (1,396) (1,350) (1,362) (1,339)
Other comprehensive income (loss) before reclassifications 44   (34) (62)
Reclassified from AOCI 41 51 85 102
Net comprehensive (loss) income 85 51 51 40
Balance (1,311) (1,299) (1,311) (1,299)
Accumulated Other Comprehensive Income (Loss)        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance (5,733) (4,591) (5,247) (5,605)
Net comprehensive (loss) income     2,230 (593)
Balance $ (3,017) $ (6,198) $ (3,017) $ (6,198)