Fair Value Measurements - Financial and non-financial assets measured at fair value on a nonrecurring basis (Details) - Nonrecurring [Member] - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	$ 8,419	$ 5,799
Other real estate owned	3,871	4,051
Repossessed assets	1,044	1,132
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	0	0
Level II [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	4,351	1,289
Other real estate owned	3,871	4,051
Repossessed assets	0	0
Level III [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	4,068	4,510
Other real estate owned	0	0
Repossessed assets	$ 1,044	$ 1,132