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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
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