CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities:
Net income	$ 305,072	$ 281,025	$ 102,273
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	22,289	24,965	20,068
Amortization of intangible assets	8,816	11,407	5,912
Provision for credit losses - expense (benefit)	27,696	(65,698)	170,985
Deferred income tax expense (benefit)	54,216	118,323	(4,371)
Stock-based compensation	5,407	5,460	5,117
Gain on early extinguishment of debt	0	0	(94)
Gain on sales of investment securities	0	0	(13,198)
Unrealized gain on derivative instruments	(1,098)	(4,227)	(5,635)
Net gain on disposals, sales and impairments of premises and equipment and other assets	(706)	(32)	(215)
Net gain on sales of loans and valuation adjustments	(5,498)	(14,791)	(13,273)
Net amortization of discounts, premiums, and deferred loan fees and costs	(7,853)	(25,294)	(8,602)
Originations and purchases of loans held for sale	(214,962)	(503,200)	(648,052)
Sales and repayments of loans held for sale	235,199	528,253	659,349
Amortization of broker placement fees	106	218	537
Net amortization of premiums and discounts on investment securities	3,435	26,549	19,410
(Increase) decrease in accrued interest receivable	(11,340)	7,701	6,419
Increase (decrease) in accrued interest payable	1,706	(2,776)	(2,990)
(Increase) decrease in other assets	(2,437)	24,344	(5,018)
Increase (decrease) in other liabilities	20,437	(12,506)	9,116
Net cash provided by operating activities	440,485	399,721	297,738
Cash flows from investing activities:
Net (disbursements) repayments on loans held for investment	(603,853)	599,097	(335,152)
Proceeds from sales of loans held for investment	62,168	81,458	6,788
Proceeds from sales of repossessed assets	46,281	55,867	35,270
Proceeds from sales of available-for-sale securities	0	0	1,195,250
Purchases of available-for-sale securities	(512,327)	(3,447,921)	(3,820,148)
Proceeds from principal repayments and maturities of available-for-sale debt securities	626,802	1,445,873	1,277,762
Purchases of held-to-maturity investment securities	(289,784)	0	0
Proceeds from principal repayments and maturities of held-to-maturity securities	32,153	12,677	6,431
Additions to premises and equipment	(20,459)	(13,349)	(16,070)
Proceeds from sales of premises and equipment and other assets	1,196	832	497
Net (purchases) redemptions of other investments securities	(23,637)	5,322	3,881
Proceeds from the settlement of insurance claims - investing activities	0	550	0
Net (payments) cash acquired in acquisition	0	(3,381)	406,626
Net cash used in investing activities	(681,460)	(1,262,975)	(1,238,865)
Cash flows from financing activities:
Net (decrease) increase in deposits	(1,706,118)	2,472,579	1,767,441
Net proceeds from short-term borrowings	550,133	0	(35,000)
Repayments of long-term borrowings	(500,000)	(240,000)	(95,282)
Proceeds from long-term borrowings	200,000	0	0
Proceeds from long-term reverse repurchase agreements	0	0	200,000
Repurchase of outstanding common stock	(277,769)	(216,522)	(206)
Dividends paid on common stock	(87,824)	(65,021)	(43,416)
Dividends paid on preferred stock	0	(2,453)	(2,676)
Redemption of preferred stock - Series A through E	0	(36,104)	0
Net cash (used in) provided by financing activities	(1,821,578)	1,912,479	1,790,861
Net (decrease) increase in cash and cash equivalents	(2,062,553)	1,049,225	849,734
Cash and cash equivalents at beginning of year	2,543,058	1,493,833	644,099
Cash and cash equivalents at end of year	480,505	2,543,058	1,493,833
Cash and cash equivalents include:
Cash and due from banks	478,480	2,540,376	1,433,261
Money market instruments	2,025	2,682	60,572
Cash and Cash Equivalents, at Carrying Value, Total	$ 480,505	$ 2,543,058	$ 1,493,833