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Comprehensive Income - Components of Accumulated Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Equity [Abstract]    
Net unrealized (losses) gains on available for sale securities $ 3,300 $ 4,040
Tax effect (1,388) (1,699)
Unrealized holding gains on available for sale securities, net of tax 1,912 2,341
Unfunded status of the supplemental retirement plans (7,309) (7,885)
Tax effect 3,073 3,315
Unfunded status of the supplemental retirement plans, net of tax (4,236) (4,570)
Joint beneficiary agreement liability 26 26
Tax effect 0 0
Joint beneficiary agreement liability, net of tax 26 26
Accumulated other comprehensive loss $ (2,298) $ (2,203)