Reclassifications Out of Accumulated Other Comprehensive Income (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net (loss) gain on sale of securities	$ 59		$ (113)		$ 14		$ (230)
Income before taxes	(10,230)		(7,972)		(18,516)		(18,509)
Income tax (benefit) expense	(3,223)		(2,537)		(5,784)		(5,933)
Net Income	(7,007)		(5,435)		(12,732)		(12,576)
Reclassified from AOCI, net of tax	235		(20)		412		(42)
Available-for-Sale Securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassified from AOCI, net of tax	195		(71)		332		(144)
Employee Benefit Plan
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassified from AOCI, net of tax	40		51		80		102
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassified from AOCI, net of tax	(235)		20		(412)		42
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	(59)		113		(14)		230
Net impairment losses	(254)				(518)
Income before taxes	(313)		113		(532)		230
Income tax (benefit) expense	(118)		42		(200)		86
Net Income	(195)		71		(332)		144
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	(64)	[1]	(70)	[1]	(129)	[1]	(139)	[1]
Amortization of gains			(12)	[1]			(24)	[1]
Income before taxes	(64)		(82)		(129)		(163)
Income tax (benefit) expense	(24)		(31)		(49)		(61)
Net Income	$ (40)		$ (51)		$ (80)		$ (102)

[1] Amortization is included in net periodic pension cost. See Note 10, "Employee Benefit Plans."