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Changes in Accumulated Other Comprehensive Income - Summary of Changes in Balances of Each Component of Accumulated Other Comprehensive Income (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]        
Beginning balance $ 228 $ 221 $ (108) $ 135
Other comprehensive income (loss) before reclassifications 581 (506) 1,088 (376)
Amounts reclassified from accumulated other comprehensive income (334) 41 (332) 41
Tax effect of current period changes (84) 158 (257) 114
Total other comprehensive income (loss), net of tax 163 (307) 499 (221)
Ending balance 391 (86) 391 (86)
Unrealized Gains and Losses on Available-for-Sale [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance 797 563 461 477
Other comprehensive income (loss) before reclassifications 581 (506) 1,088 (376)
Amounts reclassified from accumulated other comprehensive income (334) 41 (332) 41
Tax effect of current period changes (84) 158 (257) 114
Total other comprehensive income (loss), net of tax 163 (307) 499 (221)
Ending balance 960 256 960 256
Defined Benefit Pension Items [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (569) (342) (569) (342)
Ending balance $ (569) $ (342) $ (569) $ (342)