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Other Comprehensive Income (Components of Other Comprehensive Income (Loss)) (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016
Unrealized gains and losses on securities available for sale: |  |
Net gains arising during the period | $ 1,287 | $ 11,856
Reclassification adjustment for gains included in net income | 0 | (96)
Total | 1,287 | 11,760
Unrealized gains (losses) on derivatives (cash flow hedges) | 92 | (704)
Amortization related to post-retirement obligations | 53 | 165
Total other comprehensive income | 1,432 | 11,221
Unrealized gains and losses on securities available for sale: |  |
Net gains arising during the period | (516) | (4,762)
Reclassification adjustment for gains included in net income | 0 | 39
Total | (516) | (4,723)
Unrealized gains (losses) on derivatives (cash flow hedges) | (37) | 283
Amortization related to post-retirement obligations | (21) | (66)
Total other comprehensive income | (574) | (4,506)
Unrealized gains and losses on securities available for sale: |  |
Net gains arising during the period | 771 | 7,094
Reclassification adjustment for gains included in net income | 0 | (57)
Total | 771 | 7,037
Unrealized gains (losses) on derivatives (cash flow hedges) | 55 | (421)
Amortization related to post-retirement obligations | 32 | 99
Total other comprehensive income | $ 858 | $ 6,715

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