CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 166,261	$ 102,353	$ 65,774
Adjustments to reconcile net income to net cash provided by operations:
Depreciation and amortization	20,366	13,635	13,250
Deferred income tax expense	4,464	44,388	5,980
Provision for loan losses	12,700	9,735	49,348
Loss (gain) on sale of securities, net	1,853	146	(3,736)
Gain on sale of loans, net	(1,422)	(2,670)	(2,904)
Loss on foreclosed property, net	338	1,073	2,114
Increase in interest receivable	(8,985)	(7,904)	(4,155)
Proceeds from sales of loans held for sale	290,733	195,130	137,351
Origination of loans held for sale	(271,680)	(237,404)	(136,774)
(Increase) decrease in other assets	(21,644)	4,079	(11,685)
Increase in other liabilities	1,610	18,078	1,011
Gain on sale of insurance subsidiary assets	(4,871)
Other, net	1,446	4,059	2,439
Net cash flows provided by operating activities	191,169	144,698	118,013
CASH FLOWS FROM INVESTING ACTIVITIES
Purchase of securities available-for-sale	(342,500)	(369,786)	(1,120,250)
Proceeds from sales of securities available-for-sale	268,799	161,401	538,960
Proceeds from maturities, calls and paydowns of securities available-for-sale	111,801	96,728	134,501
Proceeds from sale of loans transferred to held for sale	20,894	17,613	328,381
Increase in loans, net	(1,848,463)	(847,428)	(913,069)
Proceeds from sale of insurance subsidiary assets	15,876
Purchase of premises and equipment	(10,698)	(6,428)	(5,356)
Proceeds from disposition of foreclosed property	7,947	17,220	28,489
Other, net	4,395	(20,423)	14,986
Net cash used in investing activities	(1,771,949)	(951,103)	(993,358)
CASH FLOWS FROM FINANCING ACTIVITIES
Increase in deposits, net	1,697,174	994,778	1,029,487
Net change in securities sold under agreements to repurchase	80	(2,468)	(2,346)
Net change in FHLB advances		150,000	(370,000)
Purchase of senior debt		(9,600)	(78)
Repurchase of common stock	(22,010)
Cash dividends paid on common stock	(45,995)
Proceeds from issuance of common stock		155,581
Net cash provided by financing activities	1,629,249	1,288,291	657,063
Net increase (decrease) in cash and cash equivalents	48,469	481,886	(218,282)
Cash and cash equivalents at beginning of period	730,811	248,925	467,207
Cash and cash equivalents at end of period	$ 779,280	$ 730,811	$ 248,925