Consolidated Statement of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ 15,439	$ 14,742	$ 12,610
Adjustments to reconcile net income to net cash provided (used) by operating activities:
Amortization and accretion of premiums and discounts on securities, net	1,122	1,130	2,165
Accretion of loan discounts, net	(4,806)	(869)	(456)
Amortization of deposit premiums	(1,747)	(411)	(535)
Amortization of core deposit intangibles	847	303	246
Accretion of borrowing valuation allowance	40	(4)
Provision for loan losses	17,864	2,693	2,373
Depreciation	1,849	1,485	1,352
Net loss (gain) on sale of available-for-sale securities	(772)		7
Net loss (gain) on sale of real estate acquired by foreclosure	81	(139)	(569)
Net gain on sale of mortgage loans HFS	(405)	(28)
Net gain on sale of guaranteed portion of loans	(3,484)	(2,867)	(1,229)
Originations of loans held for sale	(17,656)	(1,608)
Proceeds from sales of and principal collected on loans held for sale	19,875	2,681
Writedown of real estate acquired by foreclosure	530	141
Stock-based compensation expense	707	964	335
Deferred tax benefit	(3,409)	395	(540)
Increase in accrued interest receivable and other assets, net	2,208	1,061	(1,433)
Increase in accrued interest payable and other liabilities, net	(1,379)	138	475
Net cash provided by operating activities	26,904	19,807	14,801
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from the maturities or calls and paydowns of available-for-sale securities	51,690	34,021	49,050
Proceeds from Sale of Available-for-sale Securities	109,444	19,179	6,736
Purchases of available-for-sale securities	(53,046)	(22,081)	(76,612)
Proceeds from the maturities or calls and paydowns of held-to-maturity securities	10,192	9,855	11,161
Purchases of held-to-maturity securities	(1,788)	(3,452)	(8,988)
Proceeds from sale of guaranteed portion of loans	38,201	32,205	13,186
Proceeds from sale of real estate acquired by foreclosure	2,587	1,825	3,655
Purchases of Federal Home Loan Bank of Dallas stock, net of redemptions	359	103	(1,379)
Purchases of Federal Reserve Bank stock	(34)	(1,673)	(11)
Net increase in loans held for investment	(279,756)	(220,465)	(170,205)
Investment in construction of premises and purchases of other fixed assets	(1,349)	(984)	(2,699)
Net cash and cash equivalents (paid) received in connection with acquisitions	4,275	(30,789)
Net cash used in investing activities	(119,225)	(182,256)	(176,106)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net increase in deposit accounts	170,236	128,749	(13,544)
Net increase (decrease) in securities sold under agreements to repurchase	(1,532)	2,022	(897)
Net proceeds of other short-term borrowed funds	(113,250)	(5,000)	75,307
Proceeds of other long-term borrowed funds	100,000
Net repayment of other short-term borrowed funds	(8,684)	(1,864)	(43,486)
Proceeds from issuance of common stock due to exercise of stock options	1,534	117	190
Proceeds from issuance of common stock, gross		72,591
Net cash provided by (used in) financing activities	148,304	196,615	17,570
NET INCREASE IN CASH AND CASH EQUIVALENTS	55,983	34,166	(143,735)
CASH AND CASH EQUIVALENTS:
Beginning of year	68,923	34,757	178,492
End of year	124,906	68,923	34,757
SUPPLEMENTAL INFORMATION:
Interest paid	11,549	9,592	11,374
Income taxes paid	12,200	9,200	7,116
Noncash investing and financing activities - acquisition of real estate through foreclosure of collateral			3,815
Stock issued in connection with the Patriot Bancshares acquisition	$ 123,743	$ 72,591	$ 190