PARENT COMPANY FINANCIAL INFORMATION - Statements of Cash Flows (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash Flows from Operating Activities:
Net income	$ 166,299	$ 235,107	$ 96,953
Adjustments to reconcile net income to net cash provided by operating activities:
Share based compensation expense	7,887	5,299	3,850
Tax benefit associated with share based compensation	(646)	(1,850)	(133)
Other-net	(3,710)	1,894	2,660
Net cash provided by operating activities	216,322	216,398	141,981
Cash Flows from Investing Activities:
Proceeds from sales of investment available-for-sale	18,087	400,567	121,357
Net cash provided by/ (used in) investing activities	(1,619,196)	308,261	(1,200,196)
Cash Flows from Financing Activities:
Retirement of subordinated debt	0	(53,000)	(10,310)
Proceeds from issuance of subordinated debt	200,000	0	0
Proceeds from issuance of common stock	2,192	5,758	1,997
Stock tendered for payment of withholding taxes	(2,353)	(1,577)	(458)
Repurchase of common stock	(24,987)	(107,268)	(25,702)
Dividends paid	(61,368)	(60,351)	(53,175)
Net cash provided by/ (used in) financing activities	1,175,086	(401,642)	1,209,115
Net increase/ (decrease) in cash and cash equivalents	(227,788)	123,017	150,900
Cash and cash equivalents at beginning of year	420,020	297,003	146,103
Cash and cash equivalents at end of year	192,232	420,020	297,003
Parent Company
Cash Flows from Operating Activities:
Net income	166,299	235,107	96,953
Adjustments to reconcile net income to net cash provided by operating activities:
Equity in undistributed income-subsidiary	(113,025)	(52,295)	(30,156)
Share based compensation expense	7,887	5,299	3,850
Tax benefit associated with share based compensation	0	0	5
Other-net	(9,760)	4,133	(9,732)
Net cash provided by operating activities	51,401	192,244	60,920
Cash Flows from Investing Activities:
Proceeds from sales of investment available-for-sale	0	9,099	310
Investment in subsidiary	(150,000)	0	0
Net cash provided by/ (used in) investing activities	(150,000)	9,099	310
Cash Flows from Financing Activities:
Retirement of subordinated debt	0	(32,810)	(10,310)
Proceeds from issuance of subordinated debt	200,000	0	0
Proceeds from issuance of common stock	2,192	5,758	1,997
Stock tendered for payment of withholding taxes	(2,353)	(1,577)	(458)
Repurchase of common stock	(24,987)	(107,268)	(25,702)
Dividends paid	(61,368)	(60,351)	(53,175)
Net cash provided by/ (used in) financing activities	113,484	(196,248)	(87,648)
Net increase/ (decrease) in cash and cash equivalents	14,885	5,095	(26,418)
Cash and cash equivalents at beginning of year	69,038	63,943	90,361
Cash and cash equivalents at end of year	$ 83,923	$ 69,038	$ 63,943