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Reclassifications Out of Accumulated Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Net (loss) gain on sale of securities $ (388) $ (25) $ 79 $ (1) $ 7 $ 39 $ (213) $ 23 $ (335) $ (144) $ 1,385
Net impairment losses recognized in earnings                 (4,646)   (737)
Income before income taxes                 (37,945) (35,921) (37,814)
Income tax (expense) benefit $ (3,638) $ (3,230) $ (3,022) $ (2,929) (2,993) (3,084) (2,467) (2,837) (12,819) (11,381) (12,324)
Net income         $ (6,148) $ (6,259) $ (6,175) $ (5,958) (25,126) (24,540) (25,490)
Reclassified out of AOCI, net of tax                 2,865 113 1,485
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]                 226 260 260
Amortization of net actuarial loss                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax [1]                 47 66  
Employee Benefit Plan                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax                 273 326 260
Income tax expense                 (102) (123) (98)
Reclassified out of AOCI, net of tax                 171 203 162
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                 (335) (144) 1,385
Net impairment losses recognized in earnings                 4,646   737
Income before income taxes                 4,311 (144) 2,122
Income tax (expense) benefit                 (1,617) 54 (799)
Net income                 $ 2,694 $ (90) $ 1,323
[1] Amortization is included in net periodic pension cost. See Note 13, "Employee Benefit Plans"