Fair Value Measurements - Quantitative information about level 3 fair value measurements for financial instruments measured at fair value on non-recurring basis (Details 3) - Fair Value, Measurements, Nonrecurring - Fair Value, Inputs, Level 3 - USD ($) $ in Thousands		6 Months Ended	12 Months Ended
		Jun. 30, 2016	Dec. 31, 2015
Assets:
Total Assets		$ 4,418	$ 10,531
Impaired loans
Assets:
Total Assets	[1]	$ 4,058	$ 10,171
Impaired loans | Sales comparison | Minimum
Assets:
Adjustment for differences between the comparable sales		0.00%	0.00%
Impaired loans | Sales comparison | Maximum
Assets:
Adjustment for differences between the comparable sales		146.92%	70.99%
Impaired loans | Sales comparison | Weighted Avg
Assets:
Adjustment for differences between the comparable sales		19.32%	15.71%
Impaired loans | Income approach | Minimum
Assets:
Capitalization rate		8.25%	8.25%
Impaired loans | Income approach | Maximum
Assets:
Capitalization rate		9.75%	10.82%
Impaired loans | Income approach | Weighted Avg
Assets:
Capitalization rate		9.35%	9.69%
Discount rate			4.75%
Other real estate owned
Assets:
Total Assets		$ 360	$ 360
Other real estate owned | Sales comparison | Minimum
Assets:
Adjustment for differences between the comparable sales		11.00%	11.00%
Other real estate owned | Sales comparison | Maximum
Assets:
Adjustment for differences between the comparable sales		25.00%	25.00%
Other real estate owned | Sales comparison | Weighted Avg
Assets:
Adjustment for differences between the comparable sales		18.00%	18.00%

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