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Supplemental Comprehensive Income Disclosures - Related Tax Effects Allocated to Each Component of Other Comprehensive Income (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Supplemental Comprehensive Income Disclosures [Abstract] |  |  |
Unrealized holding (losses) gains on securities arising during the period, Pretax Amount | $ 7,023 | $ (6,304) | $ 2,798
Less: reclassification adjustment for (gains) losses on securities included in net income, Pretax Amount | (5,040) | (617) | 153
Total Unrealized (Losses) Gains on Securities, before Tax | 1,983 | (6,921) | 2,951
Unrealized holding gains on derivatives arising during the period, Pretax Amount | (901) | (479) | 450
Reclassification adjustment for gains on derivatives included in net income, Pretax Amount | (119) | 70 | 49
Total unrealized gains on derivatives, Pretax Amount | (782) | (549) | 401
Unrealized holding gains on derivatives arising during the period, Tax (Expense) Benefit | 315 | 168 | (158)
Reclassification adjustment for gains on derivatives included in net income, Tax (Expense) Benefit | (42) | 24 | 17
Total unrealized gains on derivatives, Tax (Expense) Benefit | 273 | 192 | (141)
Unrealized holding gains on derivatives arising during the period, Net of Tax Amount | (586) | (311) | 292
Reclassification adjustment for gains on derivatives included in net income, Tax (Expense) Benefit | 77 | (46) | (32)
Total unrealized gains on derivatives, Tax (Expense) Benefit | (509) | (357) | 260
Net (loss) gain, Pretax Amount | 94 | 331 | (102)
Total Unrealized Gains (Losses) for Postretirement Obligations, Before Tax | 94 | 331 | (102)
Total other comprehensive (loss) income, Pretax Amount | 1,295 | (7,139) | 3,250
Unrealized holding (losses) gains on securities arising during the period, Tax (Expense) Benefit | (2,458) | 2,206 | (978)
Less: reclassification adjustment for (gains) losses on securities included in net income, Tax (Expense) Benefit | 1,764 | 216 | (54)
Total Unrealized (Losses) Gains on Securities, Tax (Expense) Benefit | (694) | 2,422 | (1,032)
Net (loss) gain, Tax (Expense) Benefit | (20) | (116) | 36
Total Unrealized Gains (Losses) for Postretirement Obligations, Tax (Expense) Benefit | (20) | (116) | 36
Total other comprehensive (loss) income, Tax (Expense) Benefit | (441) | 2,498 | (1,137)
Unrealized holding (losses) gains on securities arising during the period, Net of Tax Amount | 4,565 | (4,098) | 1,820
Less: reclassification adjustment for (gains) losses on securities included in net income, Net of Tax Amount | (3,276) | (401) | 99
Total Unrealized (Losses) Gains on Securities, Net of Tax | 1,289 | (4,499) | 1,919
Net gain | 74 | 215 | (66)
Total Unrealized Gains (Losses) for Postretirement Obligations, Net of Tax | 74 | 215 | (66)
Total other comprehensive (loss) Income | $ 854 | $ (4,641) | $ 2,113

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- Definition Amount, before tax, after reclassification adjustment, of (increase) decrease in accumulated other comprehensive (income) loss for defined benefit plan, attributable to parent entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4569643-111683 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4569616-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=84161450&loc=SL4573702-111684 + Details
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- Definition Amount before tax, after reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 + Details
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- Definition Amount of tax expense (benefit), before reclassification adjustments, related to increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e640-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 + Details
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- Definition Amount before tax and reclassification adjustments of unrealized holding gain (loss) on available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 + Details
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