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Components of Accumulated Other Comprehensive Income, Net of Tax (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance     $ 343,017 $ 351,374
Other comprehensive income (loss) before reclassifications $ 463 $ 2,385 2,552 1,808
Reclassified from AOCI 2,924 75 3,065 59
Net comprehensive income 3,387 2,460 5,617 1,867
Balance 337,536 344,827 337,536 344,827
Available-for-Sale Securities        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance (1,706) (4,899) (3,885) (4,266)
Other comprehensive income (loss) before reclassifications 465 2,385 2,588 1,870
Reclassified from AOCI 2,881 24 2,937 (94)
Net comprehensive income 3,346 2,409 5,525 1,776
Balance 1,640 (2,490) 1,640 (2,490)
Employee Benefit Plan        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance (1,311) (1,299) (1,362) (1,339)
Other comprehensive income (loss) before reclassifications (2)   (36) (62)
Reclassified from AOCI 43 51 128 153
Net comprehensive income 41 51 92 91
Balance (1,270) (1,248) (1,270) (1,248)
Accumulated Other Comprehensive Income (Loss)        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance (3,017) (6,198) (5,247) (5,605)
Net comprehensive income     5,617 1,867
Balance $ 370 $ (3,738) $ 370 $ (3,738)