Consolidated Statement of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ 4,649	$ 3,488
Adjustments to reconcile net income to net cash provided (used) by operating activities:
Amortization and accretion of premiums and discounts on securities, net	270	291
Accretion of loan discounts, net	(713)	(141)
Amortization of deposit premiums	(241)	(93)
Amortization of core deposit intangibles	148	61
Accretion of borrowing valuation allowance	(6)
Provision for loan losses	1,505	1,223
Depreciation	426	336
Net gain on sale of mortgage loans HFS	(75)
Net gain on sale of guaranteed portion of loans	(645)	(430)
Originations of loans held for sale	(3,251)
Proceeds from sales of and principal collected on loans held for sale	2,960
Stock-based compensation expense	121	49
Increase in accrued interest receivable and other assets, net	1,371	1,601
Increase in accrued interest payable and other liabilities, net	(3,009)	(802)
Net cash provided by operating activities	3,510	5,583
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from the maturities or calls and paydowns of available-for-sale securities	11,042	15,328
Purchases of available-for-sale securities	(2,976)	(10,015)
Proceeds from the maturities or calls and paydowns of held-to-maturity securities	2,653	2,204
Purchases of held-to-maturity securities		(1,988)
Proceeds from sale of guaranteed portion of loans	7,099	6,312
Purchases of Federal Home Loan Bank of Dallas stock, net of redemptions	1,378	(5)
Purchases of Federal Reserve Bank stock	(13)	(1,127)
Net increase in loans held for investment	(16,996)	(53,066)
Investment in construction of premises and purchases of other fixed assets	(43)	(447)
Net cash used in investing activities	2,144	(42,804)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net increase in deposit accounts	86,379	39,161
Net increase (decrease) in securities sold under agreements to repurchase	8,407	5,800
Net repayment of other short-term borrowed funds	(257)	(12)
Repayment of other long-term borrowed funds	(40,000)
Proceeds from issuance of common stock due to exercise of stock options	2	76
Net cash provided by (used in) financing activities	54,531	45,025
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	60,185	7,804
CASH AND CASH EQUIVALENTS:
Beginning of year	68,923	34,757
End of year	129,108	42,561
SUPPLEMENTAL INFORMATION:
Interest paid	2,222	2,496
Income taxes paid		$ 100