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Other Comprehensive Income - Amounts Reclassified Out of Each Component of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Income tax expense $ (1,159) $ (729) $ (3,414) $ (2,306)
Net income available to common shareholders 2,862 1,900 8,360 5,790
Reclassification out of Accumulated Other Comprehensive Income [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net income available to common shareholders (46) (57) (138) (71)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Gains and Losses on Available-for-Sale Securities [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Unrealized gains and losses on available-for-sale securities   1   114
Income tax expense       (39)
Net income available to common shareholders   1   75
Reclassification out of Accumulated Other Comprehensive Income [Member] | Defined Benefit Pension Items [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Actuarial gains/(losses) (70) (89) (210) (222)
Income tax expense 24 31 72 76
Net income available to common shareholders $ (46) $ (58) $ (138) $ (146)