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Reclassifications Out of Accumulated Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Gains (losses) realized in net income $ (213) $ 59 $ (190) $ 14
Net impairment losses recognized in earnings   254   518
Amortization of losses (81) (64) (163) (129)
Income before taxes (8,642) (10,230) (17,437) (18,516)
Income tax (benefit) expense (2,467) (3,223) (5,304) (5,784)
Net Income (6,175) (7,007) (12,133) (12,732)
Reclassified from AOCI, net of tax (82) 235 (17) 412
Available-for-Sale Securities        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Reclassified from AOCI, net of tax (133) 195 (119) 332
Employee Benefit Plan        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Reclassified from AOCI, net of tax 51 40 102 80
Reclassification out of Accumulated Other Comprehensive Income        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Reclassified from AOCI, net of tax 82 (235) 17 (412)
Reclassification out of Accumulated Other Comprehensive Income | Available-for-Sale Securities        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Gains (losses) realized in net income 213 (59) 190 (14)
Net impairment losses recognized in earnings   (254)   (518)
Income before taxes 213 (313) 190 (532)
Income tax (benefit) expense 80 (118) 71 (200)
Net Income 133 (195) 119 (332)
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) (64) (130) (129)
Amortization of losses [1] (16)   (33)  
Income before taxes (81) (64) (163) (129)
Income tax (benefit) expense (30) (24) (61) (49)
Net Income $ (51) $ (40) $ (102) $ (80)
[1] Amortization is included in net periodic pension cost. See Note 10, "Employee Benefit Plans."