Fair Value of Financial Instruments Fair Value Estimates (Details) - USD ($) $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Fair Value Disclosures [Abstract]
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	$ 280,434	$ 235,116	$ 201,638
Accrued interest receivable	9,072	6,645	7,131
Other real estate owned	711	752	1,037
Off-balance sheet commitments and standby letters of credit
Notional Amount	380,783	293,228	355,024
Cost to Cede or Assume	38,078	29,323	35,502
Level 1
Assets:
Cash and cash equivalents	83,077	120,292	110,925
Securities available for sale	0	0	0
FHLB, Federal Reserve Bank, and other stock, at cost	22,843	18,494	17,067
Loans held for investment, net	0	0	0
Accrued interest receivable	9,072	6,645	7,131
Other real estate owned	0	0	0
Liabilities:
Deposit accounts	1,575,404	1,102,419	1,216,847
FHLB advances	118,208	210,000	70,025
Other borrowings	0	0	0
Subordinated debentures	0	0	0
Accrued interest payable	212	177	209
Off-balance sheet commitments and standby letters of credit
Notional Amount			0
Cost to Cede or Assume	0	0
Level 2
Assets:
Cash and cash equivalents	0	0	0
Securities available for sale	280,434	235,116	201,638
FHLB, Federal Reserve Bank, and other stock, at cost	0	0	0
Loans held for investment, net	0	0	0
Accrued interest receivable	0	0	0
Other real estate owned	0	0	0
Liabilities:
Deposit accounts	522,157	371,132	519,898
FHLB advances	0	0	0
Other borrowings	48,936	47,538	48,312
Subordinated debentures	68,675	4,592	33,456
Accrued interest payable	0	0	0
Off-balance sheet commitments and standby letters of credit
Notional Amount			35,502
Cost to Cede or Assume	38,078	29,323
Level 3
Assets:
Cash and cash equivalents	0	0	0
Securities available for sale	0	0	0
FHLB, Federal Reserve Bank, and other stock, at cost	0	0	0
Loans held for investment, net	2,150,673	1,461,796	1,686,046
Accrued interest receivable	0	0	0
Other real estate owned	711	752	1,037
Liabilities:
Deposit accounts	0	0	0
FHLB advances	0	0	0
Other borrowings	0	0	0
Subordinated debentures	0	0	0
Accrued interest payable	0	0	0
Off-balance sheet commitments and standby letters of credit
Notional Amount			0
Cost to Cede or Assume	0	0
Recurring basis
Assets:
Securities available for sale	280,434	235,116
Recurring basis | Level 1
Assets:
Securities available for sale	0	0
Recurring basis | Level 2
Assets:
Securities available for sale	280,434	235,116
Recurring basis | Level 3
Assets:
Securities available for sale	0	0
Carrying Amount
Assets:
Cash and cash equivalents	83,077	120,292	110,925
Securities available for sale	280,434	235,116	201,638
FHLB, Federal Reserve Bank, and other stock, at cost	22,843	18,494	17,067
Loans held for investment, net	2,103,460	1,457,035	1,616,422
Accrued interest receivable	9,072	6,645	7,131
Other real estate owned	711	752	1,037
Liabilities:
Deposit accounts	2,095,983	1,445,581	1,630,826
FHLB advances	118,000	210,000	70,000
Other borrowings	49,389	45,287	46,643
Subordinated debentures	70,310	10,310	70,310
Accrued interest payable	212	177	209
Estimated Fair Value
Assets:
Cash and cash equivalents	83,077	120,292	110,925
Securities available for sale	280,434	235,116	201,638
FHLB, Federal Reserve Bank, and other stock, at cost	22,843	18,494	17,067
Loans held for investment, net	2,150,673	1,461,796	1,686,046
Accrued interest receivable	9,072	6,645	7,131
Other real estate owned	711	752	1,037
Liabilities:
Deposit accounts	2,097,561	1,473,551	1,736,745
FHLB advances	118,208	210,000	70,025
Other borrowings	48,936	47,538	48,312
Subordinated debentures	68,675	4,592	33,456
Accrued interest payable	$ 212	$ 177	$ 209