Consolidated Statement of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ 20,110	$ 5,470
Adjustments to reconcile net income to net cash provided (used) by operating activities:
Amortization and accretion of premiums and discounts on securities, net	542	427
Accretion of loan discounts, net	(2,470)	(4,579)
Amortization of deposit premiums	(567)	(1,532)
Amortization of core deposit intangibles	760	804
Accretion of borrowing valuation allowance	210	79
Amortization of issuance costs for subordinated notes	72
Provision for loan losses	7,655	27,000
Depreciation	1,048	1,251
Net loss (gain) on sale of available-for-sale securities	(294)
Net loss (gain) on sale of real estate acquired by foreclosure	147	61
Net gain on sale of mortgage loans HFS	(84)	(41)
Net gain on sale of guaranteed portion of loans	(2,805)	(1,996)
Originations of loans held for sale		(1,094)
Proceeds from sales of and principal collected on loans held for sale	13,903	1,519
Writedown of real estate acquired by foreclosure	185
Stock-based compensation expense	1,059	509
Deferred tax benefit	(1,201)	(6,397)
Increase in accrued interest receivable and other assets, net	15,222	(1,288)
Increase in accrued interest payable and other liabilities, net	(3,473)	2,250
Net cash provided by operating activities	50,019	22,443
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from the maturities or calls and paydowns of available-for-sale securities	37,329	79,210
Proceeds from Sale of Available-for-sale Securities	279,168
Purchases of available-for-sale securities	(729,200)
Proceeds from the maturities or calls and paydowns of held-to-maturity securities	3,815	4,419
Purchases of held-to-maturity securities		(1,963)
Proceeds from sale of guaranteed portion of loans	33,606	22,375
Proceeds from sale of real estate acquired by foreclosure	3,967	6,265
Purchases of Federal Home Loan Bank of Dallas stock, net of redemptions	(7,329)	6,129
Purchases of Federal Reserve Bank stock	(24)	(3,729)
Net increase in loans held for investment	(68,624)	(93,767)
Investment in construction of premises and purchases of other fixed assets	(212)	(221)
Net cash used in investing activities	(447,504)	18,718
CASH FLOWS FROM FINANCING ACTIVITIES:
Net increase in deposit accounts	(13,711)	108,045
Net increase (decrease) in securities sold under agreements to repurchase	1,728	154
Net proceeds of other short-term borrowed funds	155,000	(64,250)
Proceeds from other long-term borrowed funds		50,000
Net repayment of other short-term borrowed funds		(58,884)
Proceeds from issuance of common stock due to exercise of stock options	456	71
Purchase of treasury stock		(1,253)
Net cash provided by (used in) financing activities	143,473	33,883
NET INCREASE IN CASH AND CASH EQUIVALENTS	(254,012)	75,044
CASH AND CASH EQUIVALENTS:
Beginning of year	389,007	124,906
End of year	134,995	199,950
NONCASH ACTIVITIES:
Noncash investing and financing activities - acquisition of real estate through foreclosure of collateral	5,270	420
Transfer of loans to held-for-sale	7,860	6,253
SUPPLEMENTAL INFORMATION:
Interest paid	15,108	11,139
Income taxes paid	$ 7,300	$ 7,500