Consolidated Statements of Cash Flows - Unaudited - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash Flows from Operating Activities
Net income	$ 47,804	$ 49,469
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Provision for loan losses	1,333	3,585
Depreciation and amortization	6,716	2,393
Share-based compensation expense	4,384	3,562
Deferred taxes	4,172	(2,588)
Net amortization of investment securities premiums and discounts	813	232
Unrealized loss recognized on equity securities	296	0
Gain on sale of investment securities	0	(3,183)
Impairment loss on investment securities	0	4,585
Gain on sale of SBA and other loans	(2,572)	(2,183)
Origination of loans held for sale	(14,272,175)	(14,714,280)
Proceeds from the sale of loans held for sale	14,135,931	14,727,734
Amortization of fair value discounts and premiums	85	98
Net gain on sales of other real estate owned	(28)	(163)
Valuation and other adjustments to other real estate owned	78	231
Earnings on investment in bank-owned life insurance	(3,900)	(3,624)
Increase in accrued interest receivable and other assets	(7,857)	(9,003)
Increase (decrease) in accrued interest payable and other liabilities	13,061	(29,357)
Net Cash (Used In) Provided By Operating Activities	(71,859)	27,508
Cash Flows from Investing Activities
Proceeds from maturities, calls and principal repayments of securities available for sale	26,216	22,843
Proceeds from sale of available-for-sale securities	0	115,982
Purchases of investment securities available for sale	(763,242)	(644,011)
Net increase in loans	(18,680)	(572,253)
Proceeds from sales of loans	29,038	112,927
Purchase of loans	(278,508)	(262,641)
Purchases of bank-owned life insurance	0	(50,000)
Proceeds from bank-owned life insurance	529	1,418
Net purchases of FHLB, Federal Reserve Bank, and other restricted stock	(30,148)	(61,281)
Purchases of bank premises and equipment	(608)	(1,732)
Proceeds from sales of other real estate owned	28	682
Purchase of leased assets under operating leases	(6,486)	0
Net Cash Used In Investing Activities	(1,041,861)	(1,338,066)
Cash Flows from Financing Activities
Net increase in deposits	495,812	171,587
Net increase in short-term borrowed funds from the FHLB	777,937	1,130,800
Net (decrease) increase in federal funds purchased	(50,000)	67,000
Net proceeds from issuance of long-term debt	0	98,574
Preferred stock dividends paid	(7,229)	(7,229)
Exercise of warrants	112	420
Payments of employee taxes withheld from share-based awards	(700)	(3,961)
Proceeds from issuance of common stock	3,191	1,900
Net Cash Provided By Financing Activities	1,219,123	1,459,091
Net Increase in Cash and Cash Equivalents	105,403	148,533
Cash and Cash Equivalents – Beginning	146,323	264,709
Cash and Cash Equivalents – Ending	251,726	413,242
Supplementary Cash Flows Information:
Interest paid	73,162	44,983
Income taxes paid	4,174	21,715
Non-cash items:
Transfer of loans to other real estate owned	57	0
Transfer of loans held for investment to loans held for sale	0	150,758
Transfer of loans held for sale to held for investment	129,691	0
University relationship intangible purchased not settled	$ 1,502	$ 0