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Condensed Parent Company Financial Statements - Summary of Cash Flow of Parent Company (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
CASH FLOWS FROM OPERATING ACTIVITIES |  |  |
Net income | $ 99,586 | $ 134,879 | $ 125,814
Adjustments to reconcile to net cash provided by operating activities: |  |  |
Amortization of stock-based compensation arrangements of subsidiaries | 1,516 | 1,277 | 1,352
Other, net | 7,305 | 6,740 | (1,199)
Net cash provided by operating activities | 154,341 | 158,958 | 140,010
INVESTING ACTIVITIES |  |  |
Other, net | 7,820 | 7,867 | (3,890)
Net cash (used in) provided by investing activities | (897,993) | 50,347 | (293,799)
FINANCING ACTIVITIES |  |  |
Common stock acquired | (3,098) | (1,601) | (7,914)
Cash dividends paid | (42,472) | (39,805) | (30,265)
Redemption of Junior Subordinated debentures |  |  | (5,155)
Net cash provided by (used in) financing activities | 492,283 | 234,721 | (179,831)
Net (decrease)/increase in cash, due from banks and interest-bearing deposits | (251,369) | 444,026 | (333,620)
Cash, due from banks and interest-bearing deposits at the beginning of the period | 1,868,281 | 1,424,255 | 1,757,875
Cash, due from banks and interest-bearing deposits at the end of the period | 1,616,912 | 1,868,281 | 1,424,255
SUPPLEMENTAL DISCLOSURE |  |  |
Cash paid during the period for interest | 22,056 | 54,602 | 41,549
Cash received during the period for income taxes, net | 26,525 | 30,975 | 27,952
Parent Company [Member] |  |  |
CASH FLOWS FROM OPERATING ACTIVITIES |  |  |
Net income | 99,586 | 134,879 | 125,814
Adjustments to reconcile to net cash provided by operating activities: |  |  |
Equity in undistributed earnings of subsidiaries | (51,955) | (61,194) | (87,404)
Amortization of stock-based compensation arrangements of subsidiaries | 1,456 | 1,224 | 1,306
Other, net | 188 | (440) | (2,621)
Net cash provided by operating activities | 49,275 | 74,469 | 37,095
INVESTING ACTIVITIES |  |  |
Net cash provided by acquisitions |  |  | 41,347
Payments for investments in subsidiaries | (1,000) | (134,457) |
Other, net | (1,175) | (418) | (174)
Net cash (used in) provided by investing activities | (2,175) | (134,875) | 41,173
FINANCING ACTIVITIES |  |  |
Issuance of common stock | 1,790 | 2,484 | 2,238
Common stock acquired | (3,098) | (1,601) | (7,914)
Cash dividends paid | (42,472) | (39,805) | (30,265)
Redemption of Junior Subordinated debentures |  |  | (5,155)
Net cash provided by (used in) financing activities | (43,780) | (38,922) | (41,096)
Net (decrease)/increase in cash, due from banks and interest-bearing deposits | 3,320 | (99,328) | 37,172
Cash, due from banks and interest-bearing deposits at the beginning of the period | 5,761 | 105,089 | 67,917
Cash, due from banks and interest-bearing deposits at the end of the period | 9,081 | 5,761 | 105,089
SUPPLEMENTAL DISCLOSURE |  |  |
Cash paid during the period for interest | 1,966 | 5,131 | 2,171
Cash received during the period for income taxes, net | $ 2,812 | $ 4,518 | $ 3,647

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