CONSOLIDATED STATEMENT OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash flows from operating activities:
Net income	$ 43,314	$ 33,148
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	4,449	3,922
Amortization of intangible assets	799	1,006
Provision for loan and lease losses	11,820	20,544
Deferred income tax expense	13,900	5,472
Stock-based compensation	1,018	2,205
Gain on early extinguishment of debt	0	(2,316)
Unrealized loss on derivative instruments	(589)	52
Net gain on sales of premises and equipment and other assets	(17)	(847)
Net gain on sales of loans	(1,536)	(1,096)
Net amortization/accretion of premiums, discounts and deferred loan fees and costs	(2,023)	(2,095)
Originations and purchases of loans held for sale	(74,225)	(65,984)
Sales and repayments of loans held for sale	78,654	76,163
Loans held for sale valuation adjustment	0	558
Amortization of broker placement fees	189	367
Net amortization/accretion of premium and discounts on investment securities	39	476
(Increase) decrease in accrued interest receivable	(669)	13,061
Increase in accrued interest payable	736	8
Decrease in other assets	14,176	10,566
(Decrease) increase in other liabilities	(7,053)	166
Net cash provided by operating activities	82,982	95,376
Cash flows from investing activities:
Principal collected on loans	642,758	590,753
Loans originated and purchased	(817,900)	(550,257)
Proceeds from sale of loans held for investment	4,998	13,274
Proceeds from sale of repossessed assets	11,250	10,559
Purchases of available-for-sale securities	0	(49,626)
Proceeds from principal repayments and maturities of available-for-sale securities	57,809	100,195
Proceeds from principal repayments of held-to-maturity securities	142	141
Additions to premises and equipment	(4,046)	(5,142)
Net redemptions/purchases of other investment securities	100	0
Proceeds from sale of premises and equipment and other assets	18	1,857
Net cash (used in) provided by investing activities	(104,871)	111,754
Cash flows from financing activities:
Net increase in deposits	84,436	45,026
Change in securities sold under agreements to repurchase	(50,086)	(100,000)
Repayment of junior subordinated debentures	0	(21,434)
Repurchase of outstanding common stock	(1,882)	(2,624)
Net cash provided by (used in) financing activities	25,261	(79,701)
Net increase in cash and cash equivalents	3,372	127,429
Cash and cash equivalents at beginning of period	586,203	716,395
Cash and cash equivalents at end of period	589,575	843,824
Cash and cash equivalents include:
Cash and Cash Equivalents, at Carrying Value, Total	586,203	716,395
Common Stock [Member]
Cash flows from financing activities:
Dividends paid	(6,538)	0
Preferred Stock [Member]
Cash flows from financing activities:
Dividends paid	$ (669)	$ 669