PARENT COMPANY STATEMENTS - Condensed Statements of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Operating activities:
Net Income (Loss)	$ 131,924	$ 188,081	$ 189,694
Adjustments to reconcile net income to net cash provided by operating activities
Gain on debt extinguishment	(242)	0	0
Net change in other assets and other liabilities	1,106	(6,231)	2,064
Net cash provided by operating activities	228,420	214,600	202,546
Investing activities:
Net cash provided by (used in) investing activities	335,776	(2,138,985)	(1,530,775)
Financing activities:
Issuance of common stock	1,015	1,184	9,821
Purchases of treasury stock	(30,233)	(16,614)	(5,106)
Increase in deferred compensation agreements	217	236	252
Net cash (used in) provided by financing activities	(583,130)	259,217	1,557,488
Change in cash and cash equivalents	(18,934)	(1,665,168)	229,259
Cash and cash equivalents at beginning of year	209,896	1,875,064	1,645,805
Cash and cash equivalents at end of year	190,962	209,896	1,875,064
Supplemental disclosures of cash flow information:
Cash paid for interest	100,040	23,402	13,752
Supplemental disclosures of noncash financing activities
Dividends declared and unpaid	24,168	23,762	23,235
Parent Company
Operating activities:
Net Income (Loss)	131,924	188,081	189,694
Adjustments to reconcile net income to net cash provided by operating activities
Equity in undistributed net income of subsidiaries	(36,527)	(83,041)	(52,648)
Gain on debt extinguishment	(242)	0	0
Net change in other assets and other liabilities	(573)	2,155	(3,050)
Net cash provided by operating activities	94,582	107,195	133,996
Investing activities:
Purchases of investment securities	(2,237)	(175)	(5,173)
(Capital contributions to)/Return of capital from	0	0	(12,918)
Net cash provided by (used in) investing activities	(2,237)	(175)	(18,091)
Financing activities:
Repayment of advances from subsidiaries	(533)	(506)	(482)
Repayment of borrowings	(3,000)	0	(77,320)
Issuance of common stock	10,284	8,922	16,155
Purchases of treasury stock	(30,233)	(16,614)	(5,106)
Increase in deferred compensation agreements	217	236	252
Cash dividends paid	(95,102)	(93,387)	(91,051)
Net cash (used in) provided by financing activities	(118,367)	(101,349)	(157,552)
Change in cash and cash equivalents	(26,022)	5,671	(41,647)
Cash and cash equivalents at beginning of year	160,045	154,374	196,021
Cash and cash equivalents at end of year	134,023	160,045	154,374
Supplemental disclosures of cash flow information:
Cash paid for interest	45	180	560
Supplemental disclosures of noncash financing activities
Dividends declared and unpaid	24,168	23,763	23,235
Advances from subsidiaries	$ 533	$ 506	$ 482