Fair Value Measurements Financial and non-financial assets measured at fair value on a nonrecurring basis (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Repossessed Assets Fair Value Disclosure	$ 1,132
Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	5,799	7,614
Other real estate owned	4,051	3,424
Nonrecurring [Member] | Level I [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	0	0
Other real estate owned	0	0
Repossessed Assets Fair Value Disclosure	0
Nonrecurring [Member] | Level II [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	1,289	5,756
Other real estate owned	4,051	3,424
Repossessed Assets Fair Value Disclosure	0
Nonrecurring [Member] | Level III [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans		1,858
Other real estate owned	0	0
Repossessed Assets Fair Value Disclosure	$ 1,132