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Accumulated Other Comprehensive Income (Loss) - Schedule of AOCI (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance | $ 2,852,453 | $ 2,689,570 | $ 2,154,397
Amounts reclassified from AOCI to retained earnings related to the Tax Cuts and Jobs Act of 2017 |  |  | (10,751)
Other comprehensive income (loss) before reclassifications | 103,826 | 100,973 | 15,852
Amounts reclassified from AOCI to income | (12,262) | 184 | 273
Ending Balance | 2,972,656 | 2,852,453 | 2,689,570
Adjustment |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance | (31,150) | 6,322 | (4,179)
Ending Balance |  | (31,150) | 6,322
Accumulated Other Comprehensive Income (Loss) |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance | 56,207 | (44,950) | (50,272)
Amounts reclassified from AOCI to retained earnings related to the Tax Cuts and Jobs Act of 2017 |  |  | (10,751)
Ending Balance | 147,771 | 56,207 | (44,950)
Accumulated Other Comprehensive Income (Loss) | Adjustment |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance |  |  | (52)
Unrealized Gains and Losses on Available- for-Sale Debt Securities |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance | 56,131 | (37,348) | (35,557)
Amounts reclassified from AOCI to retained earnings related to the Tax Cuts and Jobs Act of 2017 |  |  | (7,583)
Other comprehensive income (loss) before reclassifications | 97,596 | 94,964 | 7,454
Amounts reclassified from AOCI to income | (8,392) | (1,485) | (1,662)
Ending Balance | 145,335 | 56,131 | (37,348)
Unrealized Gains and Losses on Available- for-Sale Debt Securities | Adjustment |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance |  |  | 0
Unrealized Gains and Losses on Held-to- Maturity Securities |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance | 0 | (8,515) | (12,107)
Amounts reclassified from AOCI to retained earnings related to the Tax Cuts and Jobs Act of 2017 |  |  | (2,600)
Other comprehensive income (loss) before reclassifications | 0 | 6,419 | 4,514
Amounts reclassified from AOCI to income | 0 | 2,096 | 1,678
Ending Balance | 0 | 0 | (8,515)
Unrealized Gains and Losses on Held-to- Maturity Securities | Adjustment |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance |  |  | 0
Gains and Losses on Cash Flow Hedges |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance | 240 | 1,099 | (2,337)
Amounts reclassified from AOCI to retained earnings related to the Tax Cuts and Jobs Act of 2017 |  |  | (509)
Other comprehensive income (loss) before reclassifications | 6,230 | (410) | 3,884
Amounts reclassified from AOCI to income | (3,886) | (449) | 113
Ending Balance | 2,584 | 240 | 1,099
Gains and Losses on Cash Flow Hedges | Adjustment |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance |  |  | (52)
Defined Benefit Pension Plans |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance | (164) | (186) | (271)
Amounts reclassified from AOCI to retained earnings related to the Tax Cuts and Jobs Act of 2017 |  |  | (59)
Other comprehensive income (loss) before reclassifications | 0 | 0 | 0
Amounts reclassified from AOCI to income | 16 | 22 | 144
Ending Balance | $ (148) | $ (164) | (186)
Defined Benefit Pension Plans | Adjustment |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance |  |  | $ 0

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