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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, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Supplemental Comprehensive Income Disclosures [Abstract] |  |  |
Unrealized holding (losses) gains on securities arising during the period, Pretax Amount | $ 2,798 | $ 25,153 | $ (34,975)
Less: reclassification adjustment for (gains) losses on securities included in net income, Pretax Amount | 153 | (550) | 1,158
Total Unrealized (Losses) Gains on Securities, before Tax | 2,951 | 24,603 | (33,817)
Unrealized holding gains on derivatives arising during the period, Pretax Amount | 450 | 472 | 0
Reclassification adjustment for gains on derivatives included in net income, Pretax Amount | 49 | 10 | 0
Total unrealized gains on derivatives, Pretax Amount | 401 | 462 | 0
Unrealized holding gains on derivatives arising during the period, Tax (Expense) Benefit | (158) | (165) | 0
Reclassification adjustment for gains on derivatives included in net income, Tax (Expense) Benefit | 17 | 3 | 0
Total unrealized gains on derivatives, Tax (Expense) Benefit | (141) | (162) | 0
Unrealized holding gains on derivatives arising during the period, Net of Tax Amount | 292 | 307 | 0
Reclassification adjustment for gains on derivatives included in net income, Tax (Expense) Benefit | (32) | (7) | 0
Total unrealized gains on derivatives, Tax (Expense) Benefit | 260 | 300 | 0
Transition obligation | 0 | 0 | 0
Net (loss) gain, Pretax Amount | (102) | (313) | 219
Total Unrealized Gains (Losses) for Postretirement Obligations, Before Tax | (102) | (313) | 219
Total other comprehensive (loss) income, Pretax Amount | 3,250 | 24,752 | (33,598)
Unrealized holding (losses) gains on securities arising during the period, Tax (Expense) Benefit | (978) | (8,803) | 12,233
Less: reclassification adjustment for (gains) losses on securities included in net income, Tax (Expense) Benefit | (54) | 193 | (405)
Total Unrealized (Losses) Gains on Securities, Tax (Expense) Benefit | (1,032) | (8,610) | 11,828
Transition obligation, Tax (Expense) Benefit | 0 | 0 | 0
Net (loss) gain, Tax (Expense) Benefit | 36 | 109 | (77)
Total Unrealized Gains (Losses) for Postretirement Obligations, Tax (Expense) Benefit | 36 | 109 | (77)
Total other comprehensive (loss) income, Tax (Expense) Benefit | (1,137) | (8,663) | 11,751
Unrealized holding (losses) gains on securities arising during the period, Net of Tax Amount | 1,820 | 16,350 | (22,742)
Less: reclassification adjustment for (gains) losses on securities included in net income, Net of Tax Amount | 99 | (357) | 753
Total Unrealized (Losses) Gains on Securities, Net of Tax | 1,919 | 15,993 | (21,989)
Transition obligation, Net of Tax Amount | 0 | 0 | 0
Net gain | (66) | (204) | 142
Total Unrealized Gains (Losses) for Postretirement Obligations, Net of Tax | (66) | (204) | 142
Total other comprehensive (loss) Income | $ 2,113 | $ 16,089 | $ (21,847)

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