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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 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance $ (678) $ 943 $ (47) $ (4,247)
Other comprehensive income before reclassifications 780 406 57 5,582
Amounts reclassified from accumulated other comprehensive income (loss) 46 57 138 71
Total other comprehensive income 826 463 195 5,653
Ending balance 148 1,406 148 1,406
Unrealized Gains and Losses on Available-for-Sale Securities [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance 3,007 2,777 3,730 341
Other comprehensive income before reclassifications 780 406 57 2,916
Amounts reclassified from accumulated other comprehensive income (loss)   (1)   (75)
Total other comprehensive income 780 405 57 2,841
Ending balance 3,787 3,182 3,787 3,182
Defined Benefit Pension Items [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (3,685) (1,834) (3,777) (4,588)
Other comprehensive income before reclassifications       2,666
Amounts reclassified from accumulated other comprehensive income (loss) 46 58 138 146
Total other comprehensive income 46 58 138 2,812
Ending balance $ (3,639) $ (1,776) $ (3,639) $ (1,776)