Fair Value Measurements Financial assets and liabilities measured at fair value on a recurring basis (Details) - Recurring [Member] - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Assets:
U.S. government agencies	$ 78,940	$ 41,397
Obligations of states and political subdivisions	75,593	57,740
Mortgage-backed securities:
Agency	131,661	173,213
Non-agency	12,777	28,123
Other asset backed securities	58,781	31,713
Corporate securities	16,819	16,077
Interest rate contracts		50
Liabilities:
Interest rate swaps	370	337
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 contracts		0
Liabilities:
Interest rate swaps	0	0
Level II [Member]
Assets:
U.S. government agencies	78,940	41,397
Obligations of states and political subdivisions	75,593	57,740
Mortgage-backed securities:
Agency	131,661	173,213
Non-agency	12,777	28,123
Other asset backed securities	58,781	31,713
Corporate securities	16,819	16,077
Interest rate contracts		50
Liabilities:
Interest rate swaps	370	337
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 contracts		0
Liabilities:
Interest rate swaps	$ 0	$ 0
Interest Rate Swap [Member]
Mortgage-backed securities:
Interest rate contracts	73
Interest Rate Swap [Member] | Level I [Member]
Mortgage-backed securities:
Interest rate contracts	0
Interest Rate Swap [Member] | Level II [Member]
Mortgage-backed securities:
Interest rate contracts	73
Interest Rate Swap [Member] | Level III [Member]
Mortgage-backed securities:
Interest rate contracts	0
Interest Rate Cap [Member]
Mortgage-backed securities:
Interest rate contracts	39
Interest Rate Cap [Member] | Level II [Member]
Mortgage-backed securities:
Interest rate contracts	$ 39