Fair Value of Financial Instruments Assets measured at fair value on a recurring basis (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Fair Value Disclosures
Total securities available for sale:	$ 289,845
Recurring basis | Level 1
Fair Value Disclosures
Total securities available for sale:	0	$ 0
Recurring basis | Level 2
Fair Value Disclosures
Total securities available for sale:	280,273	201,638
Recurring basis | Level 3
Fair Value Disclosures
Total securities available for sale:	0	0
Municipal bonds | Recurring basis | Level 1
Fair Value Disclosures
Total securities available for sale:	0	0
Municipal bonds | Recurring basis | Level 2
Fair Value Disclosures
Total securities available for sale:	130,245	89,661
Municipal bonds | Recurring basis | Level 3
Fair Value Disclosures
Total securities available for sale:	0	0
Collateralized mortgage obligation | Recurring basis | Level 1
Fair Value Disclosures
Total securities available for sale:	0	0
Collateralized mortgage obligation | Recurring basis | Level 2
Fair Value Disclosures
Total securities available for sale:	24,543	6,862
Collateralized mortgage obligation | Recurring basis | Level 3
Fair Value Disclosures
Total securities available for sale:	0	0
Mortgage-backed securities | Recurring basis | Level 1
Fair Value Disclosures
Total securities available for sale:	0	0
Mortgage-backed securities | Recurring basis | Level 2
Fair Value Disclosures
Total securities available for sale:	125,485	105,115
Mortgage-backed securities | Recurring basis | Level 3
Fair Value Disclosures
Total securities available for sale:	0	0
Estimated Fair Value | Recurring basis
Fair Value Disclosures
Total securities available for sale:	280,273	201,638
Estimated Fair Value | Municipal bonds | Recurring basis
Fair Value Disclosures
Total securities available for sale:	130,245	89,661
Estimated Fair Value | Collateralized mortgage obligation | Recurring basis
Fair Value Disclosures
Total securities available for sale:	24,543	6,862
Estimated Fair Value | Mortgage-backed securities | Recurring basis
Fair Value Disclosures
Total securities available for sale:	$ 125,485	$ 105,115