CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash flows from operating activities:
Net income	$ 281,025	$ 102,273	$ 167,377
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	24,965	20,068	17,592
Amortization of intangible assets	11,407	5,912	3,086
Provision for credit losses - (benefit) expense	(65,698)	170,985	39,813
Deferred income tax expense (benefit)	118,323	(4,371)	55,009
Stock-based compensation	5,460	5,117	3,949
Gain on early extinguishment of debt	0	(94)	0
(Gain) loss on sales of investment securities	0	(13,198)	497
Unrealized gain on derivative instruments	(4,227)	(5,635)	(2,934)
Net (gain) loss on disposals or sales of premises and equipment and other assets	(32)	(215)	242
Net gain on sale of loans	(14,791)	(13,273)	(10,446)
Net amortization/accretion of discounts, premiums, and deferred loan fees and costs	(25,294)	(8,602)	(8,117)
Originations and purchases of loans held for sale	(503,200)	(648,052)	(362,612)
Sales and repayments of loans held for sale	528,253	659,349	360,572
Amortization of broker placement fees	218	537	732
Net amortization/accretion of premiums and discounts on investment securities	26,549	19,410	2,483
Decrease (increase) in accrued interest receivable	7,701	6,419	(1,971)
(Decrease) increase in accrued interest payable	(2,776)	(2,990)	1,081
Decrease (increase) in other assets	24,344	(5,018)	32,521
(Decrease) increase in other liabilities	(12,506)	9,116	(4,590)
Net cash provided by operating activities	399,721	297,738	294,284
Cash flows from investing activities:
Net repayments (disbursement) on loans held for investment	599,097	(335,152)	(341,870)
Proceeds from sales of loans held for investment	81,458	6,788	83,428
Proceeds from sales of repossessed assets	55,867	35,270	60,124
Proceeds from sales of available-for-sale securities	0	1,195,250	0
Purchases of available-for-sale securities	(3,447,921)	(3,820,148)	(765,432)
Proceeds from principal repayments and maturities of available-for-sale securities	1,445,873	1,277,762	628,675
Proceeds from principal repayments and maturities of held-to-maturity securities	12,677	6,431	6,138
Additions to premises and equipment	(13,349)	(16,070)	(22,478)
Proceeds from sale of premises and equipment and other assets	832	497	1,568
Net redemptions of other investment securities	5,322	3,881	6,292
Proceeds from the settlement of insurance claims - investing activities	550	0	587
Net (payments) cash acquired in acquisition	(3,381)	406,626	0
Net cash used in investing activities	(1,262,975)	(1,238,865)	(342,968)
Cash flows from financing activities:
Net increase in deposits	2,472,579	1,767,441	361,657
Net decrease in short-term borrowings	0	(35,000)	(15,086)
Repayments of long-term borrowings	(240,000)	(95,282)	(205,000)
Proceeds from long-term reverse repurchase agreements	0	200,000	0
Repurchase of outstanding common stock	(216,522)	(206)	(1,959)
Dividends paid on common stock	(65,021)	(43,416)	(30,356)
Dividends paid on preferred stock	(2,453)	(2,676)	(2,676)
Redemption of preferred stock - Series A through E	(36,104)	0	0
Net cash provided by (used in) financing activities	1,912,479	1,790,861	106,580
Net increase (decrease) in cash and cash equivalents	1,049,225	849,734	57,896
Cash and cash equivalents at beginning of year	1,493,833	644,099	586,203
Cash and cash equivalents at end of year	2,543,058	1,493,833	644,099
Cash and cash equivalents include:
Cash and due from banks	2,540,376	1,433,261	546,391
Money market instruments	2,682	60,572	97,708
Cash and Cash Equivalents, at Carrying Value, Total	$ 2,543,058	$ 1,493,833	$ 644,099