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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
Mar. 31, 2016
Mar. 31, 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) 52 $ 46
Total other comprehensive income 1,313 631
Accumulated other comprehensive income(loss), ending balance 130,540  
Unrealized Gains (Losses) on Available-for-Sale Securities [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive income(loss), beginning balance 3,554 3,730
Other comprehensive income (loss) before reclassifications 1,261 585
Amounts reclassified from accumulated other comprehensive income (loss) (3)  
Total other comprehensive income 1,258 585
Accumulated other comprehensive income(loss), ending balance 4,812 4,315
Defined Benefit Pension Items [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive income(loss), beginning balance (4,049) (3,777)
Amounts reclassified from accumulated other comprehensive income (loss) 55 46
Total other comprehensive income 55 46
Accumulated other comprehensive income(loss), ending balance (3,994) (3,731)
Accumulated Other Comprehensive Income (Loss) [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive income(loss), beginning balance (495) (47)
Other comprehensive income (loss) before reclassifications 1,261 585
Amounts reclassified from accumulated other comprehensive income (loss) 52 46
Total other comprehensive income 1,313 631
Accumulated other comprehensive income(loss), ending balance $ 818 $ 584