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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, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance $ 584 $ (2,904) $ (47) $ (4,247)
Other comprehensive income (loss) before reclassifications (1,308) 3,859 (723) 5,176
Amounts reclassified from accumulated other comprehensive income (loss) 46 (12) 92 14
Total other comprehensive income (loss) (1,262) 3,847 (631) 5,190
Ending balance (678) 943 (678) 943
Unrealized Gains and Losses on Available-for-Sale Securities [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance 4,315 1,655 3,730 341
Other comprehensive income (loss) before reclassifications (1,308) 1,193 (723) 2,510
Amounts reclassified from accumulated other comprehensive income (loss)   (71)   (74)
Total other comprehensive income (loss) (1,308) 1,122 (723) 2,436
Ending balance 3,007 2,777 3,007 2,777
Defined Benefit Pension Items [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (3,731) (4,559) (3,777) (4,588)
Other comprehensive income (loss) before reclassifications   2,666   2,666
Amounts reclassified from accumulated other comprehensive income (loss) 46 59 92 88
Total other comprehensive income (loss) 46 2,725 92 2,754
Ending balance $ (3,685) $ (1,834) $ (3,685) $ (1,834)