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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Supplemental Comprehensive Income Disclosures [Abstract]      
Unrealized holding (losses) gains on securities arising during the period, Pretax Amount $ 2,783 $ 7,023 $ (6,304)
Less: reclassification adjustment for (gains) losses on securities included in net income, Pretax Amount (8,102) (5,040) (617)
Total Unrealized (Losses) Gains on Securities, before Tax (5,319) 1,983 (6,921)
Unrealized holding gains on derivatives arising during the period, Pretax Amount 326 (901) (479)
Reclassification adjustment for gains on derivatives included in net income, Pretax Amount (10) (119) 70
Total unrealized gains on derivatives, Pretax Amount 336 (782) (549)
Unrealized holding gains on derivatives arising during the period, Tax (Expense) Benefit (68) 315 168
Reclassification adjustment for gains on derivatives included in net income, Tax (Expense) Benefit (3) (42) 24
Total unrealized gains on derivatives, Tax (Expense) Benefit (71) 273 192
Unrealized holding gains on derivatives arising during the period, Net of Tax Amount 258 (586) (311)
Reclassification adjustment for gains on derivatives included in net income, Tax (Expense) Benefit 7 77 (46)
Total unrealized gains on derivatives, Tax (Expense) Benefit 265 (509) (357)
Net (loss) gain, Pretax Amount 144 94 331
Total Unrealized Gains (Losses) for Postretirement Obligations, Before Tax 144 94 331
Total other comprehensive (loss) income, Pretax Amount (4,839) 1,295 (7,139)
Unrealized holding (losses) gains on securities arising during the period, Tax (Expense) Benefit (585) (2,458) 2,206
Less: reclassification adjustment for (gains) losses on securities included in net income, Tax (Expense) Benefit 1,701 1,764 216
Total Unrealized (Losses) Gains on Securities, Tax (Expense) Benefit 1,116 (694) 2,422
Net (loss) gain, Tax (Expense) Benefit (30) (20) (116)
Total Unrealized Gains (Losses) for Postretirement Obligations, Tax (Expense) Benefit (30) (20) (116)
Total other comprehensive (loss) income, Tax (Expense) Benefit 1,015 (441) 2,498
Unrealized holding (losses) gains on securities arising during the period, Net of Tax Amount 2,198 4,565 (4,098)
Less: reclassification adjustment for (gains) losses on securities included in net income, Net of Tax Amount (6,401) (3,276) (401)
Total Unrealized (Losses) Gains on Securities, Net of Tax (4,203) 1,289 (4,499)
Net gain 114 74 215
Total Unrealized Gains (Losses) for Postretirement Obligations, Net of Tax 114 74 215
Total other comprehensive (loss) Income $ (3,824) $ 854 $ (4,641)