Fair Value Measurements Quantitiative Information about Level 3 Non-Recurring Assets (Details) - Fair Value, Measurements, Nonrecurring [Member] - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018		Jun. 30, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Loans Receivable, Fair Value Disclosure	$ 3,051	[1]	$ 1,040	[2]
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Loans Receivable, Fair Value Disclosure	$ 3,051	[1]	$ 1,040	[2]
Loans Receivable [Member] | Weighted Average [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Fair Value, non-recurring basis, weighted average unobservable input	9.00%		6.00%
Fair Value, non-recurring basis, weighted average appraisal adjustment	7.00%		16.00%
Loans Receivable [Member] | Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Fair Value, non-recurring basis, weighted average min discount rate	0.00%		0.00%
Fair Value, non-recurring basis, appraisal adj min rate	0.00%		0.00%
Loans Receivable [Member] | Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Fair Value, non-recurring basis, weighted average max discount rate	24.00%		7.00%
Fair Value, non-recurring basis, appraisal adj max rate	20.00%		20.00%

[1] Collateral-dependent impaired loans held at June 30, 2018 that had write-downs in fair value or whose specific reserve changed during the first six months of 2018.

[2] Collateral-dependent impaired loans held at June 30, 2017 that had write-downs in fair value or whose specific reserve changed during the first six months of 2017.