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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, 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)