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Reclassifications Out of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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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"

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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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- Definition Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68072869&loc=d3e41242-110953 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(10)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 3: 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(15)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 4: 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(8)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 + Details
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 + Details
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