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Changes in Accumulated Other Comprehensive Income (Loss) By Component (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Jan. 01, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |
Beginning balance | $ 936,227 | $ 910,289 | $ 920,964 | $ 855,872 | $ 855,872 |
Ending balance | 954,812 | 910,642 | 954,812 | 910,642 | 920,964 |
Reclassification, available-for-sale debt securities, after tax | 12,602 | (5,440) | (21,651) | 4,063 |  |
Unrealized Gains (Losses) |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |
Beginning balance | (35,711) |  | (249) |  |  |
Balance after reclassification adjustments on January 1, 2018 |  |  |  |  | (1,458) |
Other comprehensive income (loss) before reclassifications | (1,206) |  | (35,459) |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) to net income | 13,808 |  | 13,808 |  |  |
Net current-period other comprehensive income (loss) | 12,602 |  | (21,651) |  |  |
Ending balance | (23,109) |  | (23,109) |  | (249) |
Foreign Currency Items |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |
Beginning balance | 0 |  | 88 |  |  |
Balance after reclassification adjustments on January 1, 2018 |  |  |  |  | 0 |
Other comprehensive income (loss) before reclassifications | 0 |  | 0 |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) to net income | 0 |  | 0 |  |  |
Net current-period other comprehensive income (loss) | 0 |  | 0 |  |  |
Ending balance | 0 |  | 0 |  | 88 |
Total Unrealized Gains (Losses) |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |
Beginning balance | (35,711) | 6,822 | (161) | (2,681) | (2,681) |
Balance after reclassification adjustments on January 1, 2018 |  |  |  |  | (1,458) |
Other comprehensive income (loss) before reclassifications | (1,206) | (2,177) | (35,459) | 9,268 |  |
Amounts reclassified from accumulated other comprehensive income (loss) to net income | 13,808 | (3,263) | 13,808 | (5,205) |  |
Net current-period other comprehensive income (loss) | 12,602 | (5,440) | (21,651) | 4,063 |  |
Ending balance | (23,109) | 1,382 | (23,109) | 1,382 | (161) |
Unrealized Gains (Losses) on Cash Flow Hedges |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |
Beginning balance | 1,714 | (1,458) | (198) | (2,211) | (2,211) |
Balance after reclassification adjustments on January 1, 2018 |  |  |  |  | (240) |
Other comprehensive income (loss) before reclassifications | 3,006 | 104 | 5,055 | (115) |  |
Amounts reclassified from accumulated other comprehensive income (loss) to net income | (1,864) | 349 | (1,959) | 1,321 |  |
Net current-period other comprehensive income (loss) | 1,142 | 453 | 3,096 | 1,206 |  |
Ending balance | 2,856 | (1,005) | 2,856 | (1,005) | (198) |
Accumulated Other Comprehensive (Loss) Income |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |
Beginning balance | (33,997) | 5,364 | (359) | (4,892) | (4,892) |
Balance after reclassification adjustments on January 1, 2018 |  |  |  |  | (1,698) |
Other comprehensive income (loss) before reclassifications | 1,800 | (2,073) | (30,404) | 9,153 |  |
Amounts reclassified from accumulated other comprehensive income (loss) to net income | 11,944 | (2,914) | 11,849 | (3,884) |  |
Net current-period other comprehensive income (loss) | 13,744 | (4,987) | (18,555) | 5,269 |  |
Ending balance | (20,253) | 377 | (20,253) | 377 | (359) |
Retained Earnings |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |
Beginning balance | 299,990 | 235,938 | 258,076 | 193,698 | 193,698 |
Ending balance | 302,404 | 240,076 | 302,404 | 240,076 | $ 258,076 |
ASU 2018-02 | Unrealized Gains (Losses) |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption |  |  |  |  |  | $ (256)
ASU 2018-02 | Foreign Currency Items |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption |  |  |  |  |  | 0
ASU 2018-02 | Total Unrealized Gains (Losses) |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption |  |  |  |  |  | (256)
ASU 2018-02 | Unrealized Gains (Losses) on Cash Flow Hedges |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption |  |  |  |  |  | (42)
ASU 2018-02 | Accumulated Other Comprehensive (Loss) Income |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption |  |  |  |  |  | (298)
Accounting Standards Update 2016-01 |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption |  |  |  |  |  | 0
Accounting Standards Update 2016-01 | Unrealized Gains (Losses) |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption |  |  |  |  |  | (953)
Accounting Standards Update 2016-01 | Foreign Currency Items |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption |  |  |  |  |  | (88)
Accounting Standards Update 2016-01 | Total Unrealized Gains (Losses) |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption |  |  |  |  |  | (1,041)
Accounting Standards Update 2016-01 | Unrealized Gains (Losses) on Cash Flow Hedges |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption |  |  |  |  |  | 0
Accounting Standards Update 2016-01 | Accumulated Other Comprehensive (Loss) Income |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption |  |  |  |  |  | (1,041)
Accounting Standards Update 2016-01 | Retained Earnings |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption |  |  |  |  |  | 1,041
Combined effect of multiple accounting pronouncements on components of shareholders' equity | Accumulated Other Comprehensive (Loss) Income |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption |  |  |  |  |  | (1,300)
Combined effect of multiple accounting pronouncements on components of shareholders' equity | Retained Earnings |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption |  |  |  |  |  | $ 1,300
Gain (Loss) on Sale of Investment Securities |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |
Reclassification, available-for-sale debt securities, before tax |  | 5,300 |  | 8,500 |  |
Reclassification, available-for-sale debt securities, after tax |  | 3,300 |  | 5,200 |  |
Interest Expense |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |
Reclassification, available-for-sale debt securities, before tax | 18,700 |  | 13,800 |  |  |
Reclassification, cash flow hedge, before tax | 303 | 572 | 175 | 2,200 |  |
Reclassification, cash flow hedge, after tax | 224 | $ 349 | 129 | $ 1,300 |  |
Non-interest income |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |
Reclassification, cash flow hedge, before tax | $ 2,800 |  |  |  |  |
Reclassification, cash flow hedge, after tax |  |  | $ 2,100 |  |  |

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