Fair Value of Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended		12 Months Ended
	Sep. 30, 2014	Sep. 30, 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	$ 282,202	$ 282,846	$ 256,089
Accrued interest receivable	6,762	5,629	6,254
Other real estate owned	752	1,186	1,186
Off-balance sheet commitments and standby letters of credit
Notional Amount	328,708	335,592	337,181
Cost to Cede or Assume	32,871	33,359	33,718
Level 1
Assets:
Cash and cash equivalents	103,631	61,419	126,813
Federal Reserve Bank, TIB and FHLB stock, at cost	18,643	10,827	15,450
Accrued interest receivable	6,762	5,629	6,254
Liabilities:
Deposit accounts	1,157,972	998,217	991,630
FHLB advances	149,999	35,000	156,000
Accrued interest payable	177	195	166
Level 2
Assets:
Securities available for sale	282,202	282,846	256,089
Loans held for sale, net		3,176	3,147
Liabilities:
Deposit accounts	371,574	284,403	301,007
Other borrowings	46,095	53,435	49,058
Subordinated debentures	34,142	4,766	4,696
Off-balance sheet commitments and standby letters of credit
Cost to Cede or Assume	32,871	33,359	33,718
Level 3
Assets:
Loans held for investment, net	1,521,466	1,225,352	1,230,316
Other real estate owned	752	1,186	1,186
Carrying Amount
Assets:
Cash and cash equivalents	103,631	61,419	126,813
Securities available for sale	282,202	282,846	256,089
Federal Reserve Bank, TIB and FHLB stock, at cost	18,643	10,827	15,450
Loans held for sale, net		3,176	3,147
Loans held for investment, net	1,537,237	1,130,975	1,231,923
Accrued interest receivable	6,762	5,629	6,254
Other real estate owned	752	1,186	1,186
Liabilities:
Deposit accounts	1,543,466	1,284,134	1,306,286
FHLB advances	150,000	35,000	156,000
Other borrowings	45,561	51,474	48,091
Subordinated debentures	70,310	10,310	10,310
Accrued interest payable	177	195	166
Estimated Fair Value
Assets:
Cash and cash equivalents	103,631	61,419	126,813
Securities available for sale	282,202	282,846	256,089
Federal Reserve Bank, TIB and FHLB stock, at cost	18,643	10,827	15,450
Loans held for sale, net		3,176	3,147
Loans held for investment, net	1,521,466	1,225,352	1,230,316
Accrued interest receivable	6,762	5,629	6,254
Other real estate owned	752	1,186	1,186
Liabilities:
Deposit accounts	1,529,546	1,282,620	1,292,637
FHLB advances	149,999	35,000	156,000
Other borrowings	46,095	53,435	49,058
Subordinated debentures	34,142	4,766	4,696
Accrued interest payable	$ 177	$ 195	$ 166