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Reclassifications Out of Accumulated Other Comprehensive Income (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]        
(Losses) gains realized in net income $ 39 $ (320) $ (151) $ (306)
Net impairment losses recognized in earnings   219   737
Amortization of losses (82) (66) (245) (195)
Income before taxes (9,343) (10,652) (26,780) (29,168)
Income tax (benefit) expense (3,084) (3,609) (8,388) (9,393)
Net Income (6,259) (7,043) (18,392) (19,775)
Reclassified from AOCI, net of tax 75 (22) 59 391
Available-for-Sale Securities        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Reclassified from AOCI, net of tax 24 (63) (94) 269
Employee Benefit Plan        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Reclassified from AOCI, net of tax 51 41 153 122
Reclassification out of Accumulated Other Comprehensive Income        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Reclassified from AOCI, net of tax (75) 22 (59) (391)
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 (39) 320 151 306
Net impairment losses recognized in earnings   (219)   (737)
Income before taxes (39) 101 151 (431)
Income tax (benefit) expense (15) 38 57 (162)
Net Income (24) 63 94 (269)
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] (65) (66) (195) (195)
Amortization of losses [1] (17)   (50)  
Income before taxes (82) (66) (245) (195)
Income tax (benefit) expense (31) (25) (92) (73)
Net Income $ (51) $ (41) $ (153) $ (122)
[1] Amortization is included in net periodic pension cost. See Note 10, "Employee Benefit Plans."