CONSOLIDATED STATEMENT OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities:
Net income	$ 102,273	$ 167,377	$ 201,608
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	20,068	17,592	15,026
Amortization of intangible assets	5,912	3,086	3,593
Provision for credit losses	170,985	39,813	58,989
Deferred income tax (benefit) expense	(4,371)	55,009	(25,043)
Stock-based compensation	5,117	3,949	5,825
Gain on early extinguishment of debt	(94)	0	(2,316)
(Gain) loss on investment securities	(13,198)	497	84
Unrealized gain on derivative instruments	(5,635)	(2,934)	(46)
Net (gain) loss on disposals or sales of premises and equipment and other assets	(215)	242	(1,366)
Net gain on sale of loans	(13,273)	(10,446)	(2,639)
Net accretion/amortization of discounts, premiums, and deferred loan fees and costs	(8,602)	(8,117)	(8,397)
Originations and purchases of loans held for sale	(648,052)	(362,612)	(319,770)
Sales and repayments of loans held for sale	659,349	360,572	344,935
Amortization of broker placement fees	537	732	1,163
Net amortization/accretion of premiums and discounts on investment securities	19,410	2,483	2,407
Decrease (increase) in accrued interest receivable	6,419	(1,971)	6,649
(Decrease) increase in accrued interest payable	(2,990)	1,081	236
(Increase) decrease in other assets	(5,018)	32,521	8,906
Net (decrease) increase in other liabilities	9,116	(4,590)	(1,521)
Net cash provided by operating activities	297,738	294,284	288,323
Cash flows from investing activities:
Net disbursement on loans held for investment	(335,152)	(341,870)	(277,863)
Proceeds from sales of loans held for investment	6,788	83,428	82,526
Proceeds from sales of repossessed assets	35,270	60,124	51,799
Proceeds from sales of available-for-sale securities	1,195,250	0	47,805
Purchases of available-for-sale securities	(3,820,148)	(765,432)	(509,884)
Proceeds from principal repayments and maturities of securities available-for-sale securities	1,277,762	628,675	387,817
Proceeds from principal repayments of held-to-maturity securities	6,431	6,138	5,828
Additions to premises and equipment	(16,070)	(22,478)	(20,514)
Proceeds from sale of premises and equipment and other assets	497	1,568	2,548
Net redemptions (purchases) of other investment securities	3,881	6,292	(993)
Proceeds from the settlement of insurance claims-investing activity	0	587	7,673
Net cash acquired in acquisition	406,626	0	0
Net cash used in investing activities	(1,238,865)	(342,968)	(223,258)
Cash flows from financing activities:
Net increase (decrease) in deposits	1,767,441	361,657	(36,889)
Net decrease in short-term borrowings	(35,000)	(15,086)	(49,914)
Repayments of long-term borrowings	(95,282)	(205,000)	(216,434)
Proceeds from long-term borrowings	0	0	120,000
Proceeds from long-term reverse repurchase agreements	200,000	0	0
Repurchase of common stock	(206)	(1,959)	(2,827)
Dividends paid on common stock	(43,416)	(30,356)	(6,517)
Dividends paid on preferred stock	(2,676)	(2,676)	(2,676)
Net cash provided by (used in) financing activities	1,790,861	106,580	(195,257)
Net increase (decrease) in cash and cash equivalents	849,734	57,896	(130,192)
Cash and cash equivalents at beginning of year	644,099	586,203	716,395
Cash and cash equivalents at end of year	1,493,833	644,099	586,203
Cash and cash equivalents include:
Cash and Cash Equivalents, at Carrying Value, Total	$ 1,493,833	$ 586,203	$ 586,203