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Reclassifications Out of Accumulated Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
(Losses) gains realized in net income $ (1) $ 23
Amortization of losses (71) (82)
Income before income taxes (9,013) (8,795)
Income tax (benefit) expense 2,929 2,837
Net Income (6,084) (5,958)
Reclassified from AOCI, net of tax (43) (65)
Available-for-Sale Securities    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Reclassified from AOCI, net of tax 1 (14)
Employee Benefit Plan    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Reclassified from AOCI, net of tax (44) (51)
Reclassification out of Accumulated Other Comprehensive Income    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Reclassified from AOCI, net of tax (43) (65)
Reclassification out of Accumulated Other Comprehensive Income | Available-for-Sale Securities    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
(Losses) gains realized in net income 1 (23)
Net impairment losses recognized in earnings 0 0
Income before income taxes 1 (23)
Income tax (benefit) expense   9
Net Income 1 (14)
Reclassification out of Accumulated Other Comprehensive Income | Employee Benefit Plan    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Amortization of prior service cost [1] (57) (65)
Amortization of losses [1] (14) (17)
Income before income taxes (71) (82)
Income tax (benefit) expense 27 31
Net Income $ (44) $ (51)
[1] Amortization is included in net periodic pension cost. See Note 10, "Employee Benefit Plans."