Fair Value Measurements - Assets and liabilities measured at fair value on non-recurring basis (Details 2) - Fair Value, Measurements, Nonrecurring - USD ($) $ in Thousands		Jun. 30, 2016	Dec. 31, 2015
Estimate of fair value
Assets:
Total Assets		$ 4,418	$ 10,531
Estimate of fair value | Impaired loans
Assets:
Total Assets	[1]	4,058	10,171
Estimate of fair value | Other real estate owned
Assets:
Total Assets		360	360
Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Total Assets
Quoted Prices in Active Markets for Identical Assets (Level 1) | Impaired loans
Assets:
Total Assets	[1]
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other real estate owned
Assets:
Total Assets
Significant Other Observable Inputs (Level 2)
Assets:
Total Assets
Significant Other Observable Inputs (Level 2) | Impaired loans
Assets:
Total Assets	[1]
Significant Other Observable Inputs (Level 2) | Other real estate owned
Assets:
Total Assets
Significant Unobservable Inputs (Level 3)
Assets:
Total Assets		4,418	10,531
Significant Unobservable Inputs (Level 3) | Impaired loans
Assets:
Total Assets	[1]	4,058	10,171
Significant Unobservable Inputs (Level 3) | Other real estate owned
Assets:
Total Assets		$ 360	$ 360

[1] Includes loans directly charged down to fair value.