Fair Value of Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Fair Value of Financial Instruments
Cost to assume off-balance sheet commitments and standby letters of credit as a percentage of notional amount	10.00%
Assets:
Securities available for sale	$ 202,142	$ 301,160	$ 256,089
Accrued interest receivable	5,865	4,898	6,254
Other real estate owned	752	1,561	1,186
Off-balance sheet commitments and standby letters of credit
Notional Amount	246,014	236,720	337,181
Cost to Cede or Assume	24,601	23,672	33,718
Level 1
Assets:
Cash and cash equivalents	124,419	99,458	126,813
Securities available for sale		85
Federal Reserve Bank, TIB and FHLB stock, at cost	14,104	10,974	15,450
Accrued interest receivable	5,865	4,898	6,254
Liabilities:
Deposit accounts	1,110,877	835,196	991,630
FHLB advances	50,000	15,691	156,000
Accrued interest payable	168	213	166
Level 2
Assets:
Securities available for sale	202,142	300,091	256,089
Loans held for sale, net		3,643	3,147
Other real estate owned			1,186
Liabilities:
Deposit accounts	354,437	351,462	301,007
Other borrowings	47,708	31,772	49,058
Subordinated debentures	4,649	4,865	4,696
Off-balance sheet commitments and standby letters of credit
Cost to Cede or Assume	24,601	23,672	33,718
Level 3
Assets:
Securities available for sale		984
Loans held for investment, net	1,392,661	1,004,001	1,230,316
Other real estate owned	752	1,561
Carrying Amount
Assets:
Cash and cash equivalents	124,419	99,458	126,813
Securities available for sale	202,142	301,160	256,089
Federal Reserve Bank, TIB and FHLB stock, at cost	14,104	10,974	15,450
Loans held for sale, net		3,643	3,147
Loans held for investment, net	1,316,687	933,834	1,231,923
Accrued interest receivable	5,865	4,898	6,254
Other real estate owned	752	1,561	1,186
Liabilities:
Deposit accounts	1,435,203	1,185,719	1,306,286
FHLB advances	50,000	15,691	156,000
Other borrowings	45,506	28,500	48,091
Subordinated debentures	10,310	10,310	10,310
Accrued interest payable	168	213	166
Estimated Fair Value
Assets:
Cash and cash equivalents	124,419	99,458	126,813
Securities available for sale	202,142	301,160	256,089
Federal Reserve Bank, TIB and FHLB stock, at cost	14,104	10,974	15,450
Loans held for sale, net		3,643	3,147
Loans held for investment, net	1,392,661	1,004,001	1,230,316
Accrued interest receivable	5,865	4,898	6,254
Other real estate owned	752	1,561	1,186
Liabilities:
Deposit accounts	1,465,314	1,186,658	1,292,637
FHLB advances	50,000	15,691	156,000
Other borrowings	47,708	31,772	49,058
Subordinated debentures	4,649	4,865	4,696
Accrued interest payable	$ 168	$ 213	$ 166