Fair Value Measurements - Carrying amounts and estimated fair values of Company's financial instruments (Details 6) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015	Dec. 31, 2014
Financial assets:
Cash and cash equivalents	$ 90,935	$ 42,917	$ 78,143	$ 35,995
Financial liabilities:
Deposits with stated maturities	325,611	333,345
Carrying amount
Financial assets:
Cash and cash equivalents	90,935	42,917
Loans, net	1,001,588	977,611
Restricted equity securities	5,478	5,169
Financial liabilities:
Deposits with stated maturities	325,611	333,345
Deposits without stated maturities	1,258,842	1,195,735
Securities sold under repurchase agreements	631	15,684
Advances from FHLB	90,000	85,000
Subordinated debentures	20,000	20,000
Fair value, recurring basis | Total
Financial assets:
Cash and cash equivalents	90,935	42,917
Loans, net	1,004,220	981,011
Financial liabilities:
Deposits with stated maturities	326,431	334,920
Deposits without stated maturities	1,258,842	1,195,735
Securities sold under repurchase agreements	631	15,691
Advances from FHLB	91,818	86,854
Subordinated debentures	15,167	15,065
Fair value, recurring basis | Level 1
Financial assets:
Cash and cash equivalents	90,935	42,917
Loans, net
Financial liabilities:
Deposits with stated maturities
Deposits without stated maturities	1,258,842	1,195,735
Securities sold under repurchase agreements	631	15,691
Advances from FHLB
Subordinated debentures
Fair value, recurring basis | Level 2
Financial assets:
Cash and cash equivalents
Loans, net
Financial liabilities:
Deposits with stated maturities	326,431	334,920
Deposits without stated maturities
Securities sold under repurchase agreements
Advances from FHLB	91,818	86,854
Subordinated debentures
Fair value, recurring basis | Level 3
Financial assets:
Cash and cash equivalents
Loans, net	1,004,220	981,011
Financial liabilities:
Deposits with stated maturities
Deposits without stated maturities
Securities sold under repurchase agreements
Advances from FHLB
Subordinated debentures	$ 15,167	$ 15,065