Fair Value of Financial Instruments Fair value estimates (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Assets:
Securities available for sale	$ 280,273	$ 201,638
Accrued interest receivable	9,315	7,131
Liabilities:
FHLB advances	148,000	70,000
Level 1
Assets:
Cash and cash equivalents	78,417	110,925
Securities available for sale	0	0
Federal Reserve Bank and FHLB stock, at cost	0	0
Loans held for sale, net	0
Loans held for investment, net	0	0
Accrued interest receivable	9,315	7,131
Liabilities:
Deposit accounts	1,674,148	1,216,847
FHLB advances	0	0
Other borrowings	0	0
Subordinated debentures	0	0
Accrued interest payable	206	209
Level 2
Assets:
Cash and cash equivalents	0	0
Securities available for sale	280,273	201,638
Federal Reserve Bank and FHLB stock, at cost	22,292	17,067
Loans held for sale, net	9,507
Loans held for investment, net	0	0
Accrued interest receivable	0	0
Liabilities:
Deposit accounts	521,291	519,898
FHLB advances	148,036	70,025
Other borrowings	49,156	48,312
Subordinated debentures	68,675	33,456
Accrued interest payable	0	0
Level 3
Assets:
Cash and cash equivalents	0	0
Securities available for sale	0	0
Federal Reserve Bank and FHLB stock, at cost	0	0
Loans held for sale, net	0
Loans held for investment, net	2,244,936	2,116,719
Accrued interest receivable	0	0
Liabilities:
Deposit accounts	0	0
FHLB advances	0	0
Other borrowings	0	0
Subordinated debentures	0	0
Accrued interest payable	0	0
Carrying Amount
Assets:
Cash and cash equivalents	78,417	110,925
Securities available for sale	280,273	201,638
Federal Reserve Bank and FHLB stock, at cost	22,292	17,067
Loans held for sale, net	8,565
Loans held for investment, net	2,236,998	1,616,422
Accrued interest receivable	9,315	7,131
Liabilities:
Deposit accounts	2,195,123	1,630,826
FHLB advances	148,000	70,000
Other borrowings	48,125	46,643
Subordinated debentures	70,310	70,310
Accrued interest payable	206	209
Estimated Fair Value
Assets:
Cash and cash equivalents	78,417	110,925
Securities available for sale	280,273	201,638
Federal Reserve Bank and FHLB stock, at cost	22,292	17,067
Loans held for sale, net	9,507
Loans held for investment, net	2,244,936	2,116,719
Accrued interest receivable	9,315	7,131
Liabilities:
Deposit accounts	2,195,439	1,736,745
FHLB advances	148,036	70,025
Other borrowings	49,156	48,312
Subordinated debentures	68,675	33,456
Accrued interest payable	$ 206	$ 209