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Other Comprehensive Income (Loss) (Components of OCI) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Total other comprehensive (loss) income, before tax | $ 950 | $ (1,912) | $ 4,496 | $ 14,238
Total other comprehensive income (loss), tax effect | (381) | 768 | (1,807) | (5,718)
Reclassification adjustment for losses (gains) included in net income, after tax | (36) | (115) | (105) | (456)
Total other comprehensive income (loss) | 569 | (1,144) | 2,689 | 8,520
Unrealized gains and losses on securities available for sale [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Net (losses) gains arising during the period, before tax | 799 | (2,575) | 4,136 | 14,260
Reclassification adjustment for losses (gains) included in net income, before tax | 0 | 43 | 0 | (54)
Total other comprehensive (loss) income, before tax | 799 | (2,532) | 4,136 | 14,206
Net (losses) gains arising during the period, tax effect | (320) | 1,034 | (1,658) | (5,727)
Reclassification adjustment for losses (gains) included in net income, tax effect | 0 | (17) | 0 | 22
Total other comprehensive income (loss), tax effect | (320) | 1,017 | (1,658) | (5,705)
Net (losses) gains arising during the period, after tax | 479 | (1,541) | 2,478 | 8,533
Reclassification adjustment for losses (gains) included in net income, after tax | 0 | 26 | 0 | (32)
Total other comprehensive income (loss) | 479 | (1,515) | 2,478 | 8,501
Unrealized gains (losses) on derivatives (cash flow hedges) [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Total other comprehensive (loss) income, before tax | 90 | 384 | 177 | (603)
Total other comprehensive income (loss), tax effect | (36) | (154) | (71) | 242
Total other comprehensive income (loss) | 54 | 230 | 106 | (361)
Post-retirement obligations [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Total other comprehensive (loss) income, before tax | 61 | 236 | 183 | 635
Total other comprehensive income (loss), tax effect | (25) | (95) | (78) | (255)
Total other comprehensive income (loss) | $ 36 | $ 141 | $ 105 | $ 380

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