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Reclassifications Out of Accumulated Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net (loss) gain on sale of securities $ (25) $ 39 $ 53 $ (151)
Net impairment losses recognized in earnings (4,635)   (4,646)  
Income before income taxes (9,613) (9,343) (27,903) (26,780)
Income Tax Expense (3,230) (3,084) (9,181) (8,388)
Net income (6,383) (6,259) (18,722) (18,392)
Reclassified out of AOCI, net of tax (2,924) (75) (3,065) (59)
Amortization of prior service cost        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax [1] (57) (65) (170) (195)
Amortization of net actuarial benefit cost        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax [1] (12) (17) (35) (50)
Employee Benefit Plan        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax (69) (82) (205) (245)
Income tax effect (26) (31) (77) (92)
Reclassified out of AOCI, net of tax (43) (51) (128) (153)
Reclassification out of Accumulated Other Comprehensive Income | Available-for-Sale Securities        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net (loss) gain on sale of securities 25 (39) (53) 151
Net impairment losses recognized in earnings (4,635)   (4,646)  
Income before income taxes (4,610) (39) (4,699) 151
Income Tax Expense (1,729) (15) (1,762) 57
Net income $ (2,881) $ (24) $ (2,937) $ 94
[1] Amortization is included in net periodic pension cost. See Note 11, "Employee Benefit Plans."