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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, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Supplemental Comprehensive Income Disclosures [Abstract] |  |  |
Unrealized holding (losses) gains on securities arising during the period, Pretax Amount | $ (6,304) | $ 2,798 | $ 25,153
Less: reclassification adjustment for (gains) losses on securities included in net income, Pretax Amount | (617) | 153 | (550)
Total Unrealized (Losses) Gains on Securities, before Tax | (6,921) | 2,951 | 24,603
Unrealized holding gains on derivatives arising during the period, Pretax Amount | (479) | 450 | 472
Reclassification adjustment for gains on derivatives included in net income, Pretax Amount | 70 | 49 | 10
Total unrealized gains on derivatives, Pretax Amount | (549) | 401 | 462
Unrealized holding gains on derivatives arising during the period, Tax (Expense) Benefit | 168 | (158) | (165)
Reclassification adjustment for gains on derivatives included in net income, Tax (Expense) Benefit | 24 | 17 | 3
Total unrealized gains on derivatives, Tax (Expense) Benefit | 192 | (141) | (162)
Unrealized holding gains on derivatives arising during the period, Net of Tax Amount | (311) | 292 | 307
Reclassification adjustment for gains on derivatives included in net income, Tax (Expense) Benefit | (46) | (32) | (7)
Total unrealized gains on derivatives, Tax (Expense) Benefit | (357) | 260 | 300
Transition obligation | 0 | 0 | 0
Net (loss) gain, Pretax Amount | 331 | (102) | (313)
Total Unrealized Gains (Losses) for Postretirement Obligations, Before Tax | 331 | (102) | (313)
Total other comprehensive (loss) income, Pretax Amount | (7,139) | 3,250 | 24,752
Unrealized holding (losses) gains on securities arising during the period, Tax (Expense) Benefit | 2,206 | (978) | (8,803)
Less: reclassification adjustment for (gains) losses on securities included in net income, Tax (Expense) Benefit | 216 | (54) | 193
Total Unrealized (Losses) Gains on Securities, Tax (Expense) Benefit | 2,422 | (1,032) | (8,610)
Transition obligation, Tax (Expense) Benefit | 0 | 0 | 0
Net (loss) gain, Tax (Expense) Benefit | (116) | 36 | 109
Total Unrealized Gains (Losses) for Postretirement Obligations, Tax (Expense) Benefit | (116) | 36 | 109
Total other comprehensive (loss) income, Tax (Expense) Benefit | 2,498 | (1,137) | (8,663)
Unrealized holding (losses) gains on securities arising during the period, Net of Tax Amount | (4,098) | 1,820 | 16,350
Less: reclassification adjustment for (gains) losses on securities included in net income, Net of Tax Amount | (401) | 99 | (357)
Total Unrealized (Losses) Gains on Securities, Net of Tax | (4,499) | 1,919 | 15,993
Transition obligation, Net of Tax Amount | 0 | 0 | 0
Net gain | 215 | (66) | (204)
Total Unrealized Gains (Losses) for Postretirement Obligations, Net of Tax | 215 | (66) | (204)
Total other comprehensive (loss) Income | $ (4,641) | $ 2,113 | $ 16,089

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- Definition Amount before tax, after reclassification adjustments, of (increase) decrease in accumulated other comprehensive (income) loss related to pension and other postretirement defined benefit plans, 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=68079674&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=68079674&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=64809438&loc=SL4573702-111684 + Details
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