Fair Value Measurements Financial assets and liabilities measured at fair value on a recurring basis (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Level I [Member]
Assets:
Cash and cash equivalents	$ 49,407	$ 55,022
Liabilities:
Interest rate swaps	0	0
Level II [Member]
Assets:
Cash and cash equivalents	0	0
Liabilities:
Interest rate swaps	341	337
Level III [Member]
Assets:
Cash and cash equivalents	0	0
Liabilities:
Interest rate swaps	0	0
Recurring [Member]
Assets:
U.S. government agencies	45,471	41,397
Obligations of states and political subdivisions	73,243	57,740
Mortgage-backed securities:
Agency	146,366	173,213
Non-agency	17,866	28,123
Other asset backed securities	52,193	31,713
Corporate securities	16,801	16,077
Interest rate swaps	52	50
Liabilities:
Interest rate swaps	341	337
Recurring [Member] | Level I [Member]
Assets:
U.S. government agencies	0	0
Obligations of states and political subdivisions	0	0
Mortgage-backed securities:
Agency	0	0
Non-agency	0	0
Other asset backed securities	0	0
Corporate securities	0	0
Interest rate swaps	0	0
Liabilities:
Interest rate swaps	0	0
Recurring [Member] | Level II [Member]
Assets:
U.S. government agencies	45,471	41,397
Obligations of states and political subdivisions	73,243	57,740
Mortgage-backed securities:
Agency	146,366	173,213
Non-agency	17,866	28,123
Other asset backed securities	52,193	31,713
Corporate securities	16,801	16,077
Interest rate swaps	52	50
Liabilities:
Interest rate swaps	341	337
Recurring [Member] | Level III [Member]
Assets:
U.S. government agencies	0	0
Obligations of states and political subdivisions	0	0
Mortgage-backed securities:
Agency	0	0
Non-agency	0	0
Other asset backed securities	0	$ 0
Corporate securities	0
Interest rate swaps	0	$ 0
Liabilities:
Interest rate swaps	0	$ 0
US Treasury Securities [Member] | Recurring [Member]
Assets:
Cash and cash equivalents	50
US Treasury Securities [Member] | Recurring [Member] | Level I [Member]
Assets:
Cash and cash equivalents	0
US Treasury Securities [Member] | Recurring [Member] | Level II [Member]
Assets:
Cash and cash equivalents	50
US Treasury Securities [Member] | Recurring [Member] | Level III [Member]
Assets:
Cash and cash equivalents	$ 0