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Condensed Parent Company Financial Statements - Summary of Cash Flow of Parent Company (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES |  |  |  |  |  |  |  |  |  |  |
Net income | $ 35,507 | $ 33,368 | $ 34,167 | $ 31,837 | $ 32,725 | $ 32,883 | $ 30,586 | $ 29,620 | $ 134,879 | $ 125,814 | $ 86,439
Adjustments to reconcile to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |
Amortization of stock-based compensation arrangements of subsidiaries |  |  |  |  |  |  |  |  | 1,277 | 1,352 | 1,180
Other, net |  |  |  |  |  |  |  |  | 6,740 | (1,199) | 4,051
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 158,958 | 140,010 | 109,749
INVESTING ACTIVITIES |  |  |  |  |  |  |  |  |  |  |
Other, net |  |  |  |  |  |  |  |  | 7,867 | (3,890) | 4,038
Net cash provided by (used in) investing activities |  |  |  |  |  |  |  |  | 50,347 | (293,799) | (349,784)
FINANCING ACTIVITIES |  |  |  |  |  |  |  |  |  |  |
Common stock acquired |  |  |  |  |  |  |  |  | (1,601) | (7,914) |
Cash dividends paid |  |  |  |  |  |  |  |  | (39,805) | (30,265) | (24,783)
Redemption of Junior Subordinated debentures |  |  |  |  |  |  |  |  |  | (5,155) |
Net cash provided by (used in) financing activities |  |  |  |  |  |  |  |  | 234,721 | (179,831) | 147,449
Net increase/(decrease) in cash, due from banks and interest-bearing deposits |  |  |  |  |  |  |  |  | 444,026 | (333,620) | (92,586)
Cash, due from banks and interest-bearing deposits at the beginning of the period |  |  |  | 1,424,255 |  |  |  | 1,757,875 | 1,424,255 | 1,757,875 | 1,850,461
Cash, due from banks and interest-bearing deposits at the end of the period | 1,868,281 |  |  |  | 1,424,255 |  |  |  | 1,868,281 | 1,424,255 | 1,757,875
SUPPLEMENTAL DISCLOSURE |  |  |  |  |  |  |  |  |  |  |
Cash paid during the period for interest |  |  |  |  |  |  |  |  | 54,602 | 41,549 | 20,563
Cash received during the period for income taxes, net |  |  |  |  |  |  |  |  | 30,975 | 27,952 | 41,058
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
CASH FLOWS FROM OPERATING ACTIVITIES |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 134,879 | 125,814 | 86,439
Adjustments to reconcile to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |
Equity in undistributed earnings of subsidiaries |  |  |  |  |  |  |  |  | (61,194) | (87,404) | (57,429)
Amortization of stock-based compensation arrangements of subsidiaries |  |  |  |  |  |  |  |  | 1,224 | 1,306 | 1,142
Other, net |  |  |  |  |  |  |  |  | (440) | (2,621) | 569
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 74,469 | 37,095 | 30,721
INVESTING ACTIVITIES |  |  |  |  |  |  |  |  |  |  |
Net cash provided by acquisitions |  |  |  |  |  |  |  |  |  | 41,347 |
Payments for investments in subsidiaries |  |  |  |  |  |  |  |  | (134,457) |  | (502)
Other, net |  |  |  |  |  |  |  |  | (418) | (174) | 100
Net cash provided by (used in) investing activities |  |  |  |  |  |  |  |  | (134,875) | 41,173 | (402)
FINANCING ACTIVITIES |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock |  |  |  |  |  |  |  |  | 2,484 | 2,238 | 4,844
Common stock acquired |  |  |  |  |  |  |  |  | (1,601) | (7,914) |
Cash dividends paid |  |  |  |  |  |  |  |  | (39,805) | (30,265) | (24,783)
Redemption of Junior Subordinated debentures |  |  |  |  |  |  |  |  |  | (5,155) |
Net cash provided by (used in) financing activities |  |  |  |  |  |  |  |  | (38,922) | (41,096) | (19,939)
Net increase/(decrease) in cash, due from banks and interest-bearing deposits |  |  |  |  |  |  |  |  | (99,328) | 37,172 | 10,380
Cash, due from banks and interest-bearing deposits at the beginning of the period |  |  |  | $ 105,089 |  |  |  | $ 67,917 | 105,089 | 67,917 | 57,537
Cash, due from banks and interest-bearing deposits at the end of the period | $ 5,761 |  |  |  | $ 105,089 |  |  |  | 5,761 | 105,089 | 67,917
SUPPLEMENTAL DISCLOSURE |  |  |  |  |  |  |  |  |  |  |
Cash paid during the period for interest |  |  |  |  |  |  |  |  | 5,131 | 2,171 | 2,122
Cash received during the period for income taxes, net |  |  |  |  |  |  |  |  | $ 4,518 | $ 3,647 | $ 4,643

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