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Other Comprehensive Income - Changes in Each Component of Accumulated Other Comprehensive Income (Loss), 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]        
Accumulated other comprehensive income(loss), beginning balance     $ 125,173  
Amounts reclassified from accumulated other comprehensive income (loss) $ 59 $ 46 111 $ 92
Total other comprehensive income (loss) 1,106 (1,262) 2,419 (631)
Accumulated other comprehensive income(loss), ending balance 136,203   136,203  
Unrealized Gains (Losses) on Available-for-Sale Securities [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive income(loss), beginning balance 4,812 4,315 3,554 3,730
Other comprehensive income (loss) before reclassifications 1,047 (1,308) 2,308 (723)
Amounts reclassified from accumulated other comprehensive income (loss) 4   1  
Total other comprehensive income (loss) 1,051 (1,308) 2,309 (723)
Accumulated other comprehensive income(loss), ending balance 5,863 3,007 5,863 3,007
Defined Benefit Pension Items [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive income(loss), beginning balance (3,994) (3,731) (4,049) (3,777)
Amounts reclassified from accumulated other comprehensive income (loss) 55 46 110 92
Total other comprehensive income (loss) 55 46 110 92
Accumulated other comprehensive income(loss), ending balance (3,939) (3,685) (3,939) (3,685)
Accumulated Other Comprehensive Income (Loss) [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive income(loss), beginning balance 818 584 (495) (47)
Other comprehensive income (loss) before reclassifications 1,047 (1,308) 2,308 (723)
Amounts reclassified from accumulated other comprehensive income (loss) 59 46 111 92
Total other comprehensive income (loss) 1,106 (1,262) 2,419 (631)
Accumulated other comprehensive income(loss), ending balance $ 1,924 $ (678) $ 1,924 $ (678)