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Reclassifications Out of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Net (loss) gain on sale of securities |  | $ (25) | $ 39 | $ 53 | $ (151)
Net impairment losses recognized in earnings |  | (4,635) |  | (4,646) |
Income before income taxes |  | (9,613) | (9,343) | (27,903) | (26,780)
Income Tax Expense |  | (3,230) | (3,084) | (9,181) | (8,388)
Net income |  | (6,383) | (6,259) | (18,722) | (18,392)
Reclassified out of AOCI, net of tax |  | (2,924) | (75) | (3,065) | (59)
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] | (57) | (65) | (170) | (195)
Amortization of net actuarial benefit cost |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | [1] | (12) | (17) | (35) | (50)
Employee Benefit Plan |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax |  | (69) | (82) | (205) | (245)
Income tax effect |  | (26) | (31) | (77) | (92)
Reclassified out of AOCI, net of tax |  | (43) | (51) | (128) | (153)
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 |  | 25 | (39) | (53) | 151
Net impairment losses recognized in earnings |  | (4,635) |  | (4,646) |
Income before income taxes |  | (4,610) | (39) | (4,699) | 151
Income Tax Expense |  | (1,729) | (15) | (1,762) | 57
Net income |  | $ (2,881) | $ (24) | $ (2,937) | $ 94
[1] | Amortization is included in net periodic pension cost. See Note 11, "Employee Benefit Plans."

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- Definition The net gain (loss) realized from the sale, exchange, redemption, or retirement of securities, not separately or otherwise categorized as trading, available-for-sale, or held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(h)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.3) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 + Details
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