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Reclassifications Out of Accumulated Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
(Losses) gains realized in net income $ 7 $ 39 $ (213) $ 23 $ 1,691 $ (320) $ 59 $ (45) $ (144) $ 1,385 $ (399)
Net impairment losses recognized in earnings                   (737) (320)
Amortization of losses                 (326) (260) (327)
Income before taxes (9,141) (9,343) (8,642) (8,795) (8,646) (10,652) (10,230) (8,286) (35,921) (37,814) (34,220)
Income tax (benefit) expense (2,993) (3,084) (2,467) (2,837) (2,931) (3,609) (3,223) (2,561) (11,381) (12,324) (10,908)
Net Income $ (6,148) $ (6,259) $ (6,175) $ (5,958) $ (5,715) $ (7,043) $ (7,007) $ (5,725) (24,540) (25,490) (23,312)
Reclassified from AOCI, net of tax                 113 1,485 156
Available-for-Sale Securities                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Reclassified from AOCI, net of tax                 (90) 1,323 (49)
Employee Benefit Plan                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Reclassified from AOCI, net of tax                 203 162 205
Reclassification out of Accumulated Other Comprehensive Income                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Reclassified from AOCI, net of tax                 (113) (1,485) (156)
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                 144 (1,385) 399
Net impairment losses recognized in earnings                   (737) (320)
Income before taxes                 144 (2,122) 79
Income tax (benefit) expense                 54 (799) 30
Net Income                 90 (1,323) 49
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]                 (260) (260) (277)
Amortization of losses [1]                 (66)   (50)
Income before taxes                 (326) (260) (327)
Income tax (benefit) expense                 (123) (98) (122)
Net Income                 $ (203) $ (162) $ (205)
[1] Amortization is included in net periodic pension cost. See Note 13, "Employee Benefit Plans."