CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash flows from operating activities:
Net income	$ 302,864	$ 305,072	$ 281,025
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	20,501	22,289	24,965
Amortization of intangible assets	7,735	8,816	11,407
Provision for credit losses - expense (benefit)	60,940	27,696	(65,698)
Deferred income tax expense	6,105	54,216	118,323
Stock-based compensation	7,799	5,407	5,460
Gain on early extinguishment of debt	(1,605)	0	0
Unrealized gain on derivative instruments	(301)	(1,098)	(4,227)
Net gain on disposals or sales, and impairments of premises and equipment and other assets	(3,514)	(706)	(32)
Net gain on sales of loans and loans held-for-sale valuation adjustments	(1,572)	(5,498)	(14,791)
Net amortization of discounts, premiums, and deferred loan fees and costs	1,223	(7,853)	(25,294)
Originations and purchases of loans held for sale	(147,460)	(214,962)	(503,200)
Sales and repayments of loans held for sale	149,888	235,199	528,253
Amortization of broker placement fees	309	106	218
Net amortization of premiums and discounts on investment securities	4,967	3,435	26,549
(Increase) decrease in accrued interest receivable	(5,437)	(11,340)	7,701
Increase (decrease) in accrued interest payable	18,430	1,706	(2,776)
(Increase) decrease in other assets	(16,619)	(2,437)	24,344
(Decrease) increase in other liabilities	(41,290)	20,437	(12,506)
Net cash provided by operating activities	362,963	440,485	399,721
Cash flows from investing activities:
Net (disbursements) repayments on loans held for investment	(758,232)	(603,853)	599,097
Proceeds from sales of loans held for investment	7,736	62,168	81,458
Proceeds from sales of repossessed assets	53,870	46,281	55,867
Purchases of available-for-sale debt securities	(5,458)	(512,327)	(3,447,921)
Proceeds from principal repayments and maturities of available-for-sale debt securities	549,644	626,802	1,445,873
Purchases of held-to-maturity debt securities	0	(289,784)	0
Proceeds from principal repayments and maturities of held-to-maturity debt securities	85,988	32,153	12,677
Additions to premises and equipment	(22,599)	(20,459)	(13,349)
Proceeds from sales of premises and equipment and other assets	4,475	1,196	832
Net redemptions (purchases) of other investments securities	5,643	(23,637)	5,322
Proceeds from the settlement of insurance claims - investing activities	483	0	550
Net cash paid from business combination	0	0	(3,381)
Net cash used in investing activities	(78,450)	(681,460)	(1,262,975)
Cash flows from financing activities:
Net increase (decrease) in deposits	470,981	(1,706,118)	2,472,579
Net (repayments) proceeds of short-term borrowings	(550,133)	550,133	0
Repayments of long-term borrowings	(19,795)	(500,000)	(240,000)
Proceeds from long-term borrowings	300,000	200,000	0
Repurchase of outstanding common stock	(203,241)	(277,769)	(216,522)
Dividends paid on common stock	(99,666)	(87,824)	(65,021)
Dividends paid on preferred stock	0	0	(2,453)
Redemption of preferred stock - Series A through E	0	0	(36,104)
Net cash (used in) provided by financing activities	(101,854)	(1,821,578)	1,912,479
Net increase (decrease) in cash and cash equivalents	182,659	(2,062,553)	1,049,225
Cash and cash equivalents at beginning of year	480,505	2,543,058	1,493,833
Cash and cash equivalents at end of period	663,164	480,505	2,543,058
Cash and cash equivalents include:
Cash and due from banks	661,925	478,480	2,540,376
Money market investments	1,239	2,025	2,682
Cash and Cash Equivalents, at Carrying Value, Total	$ 663,164	$ 480,505	$ 2,543,058