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Components of Accumulated Other Comprehensive Income, Net of Tax (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance $ 343,017 $ 351,374 $ 328,606
Other comprehensive income (loss) before reclassifications 371 245 7,650
Reclassified from AOCI 2,865 113 1,485
Other comprehensive income (loss), net 3,236 358 9,135
Balance 339,057 343,017 351,374
Available-for-Sale Securities      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance (3,885) (4,266) (13,640)
Other comprehensive income (loss) before reclassifications 647 471 8,051
Reclassified from AOCI 2,694 (90) 1,323
Other comprehensive income (loss), net 3,341 381 9,374
Balance (544) (3,885) (4,266)
Employee Benefit Plan      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance (1,362) (1,339) (1,100)
Other comprehensive income (loss) before reclassifications (276) (226) (401)
Reclassified from AOCI 171 203 162
Other comprehensive income (loss), net (105) (23) (239)
Balance (1,467) (1,362) (1,339)
Accumulated Other Comprehensive Income (Loss)      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance (5,247) (5,605) (14,740)
Other comprehensive income (loss), net 3,236 358 9,135
Balance $ (2,011) $ (5,247) $ (5,605)