Fair Value Measurements Fair Value Nonrecurring Basis (Details) - Fair Value, Measurements, Nonrecurring [Member] - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2017	[1]	Jun. 30, 2016	[2]	Jun. 30, 2017	[1]	Jun. 30, 2016	[2]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Receivable, Fair Value Disclosure	$ 1,040		$ 7,806		$ 1,040		$ 7,806
Loans Receivable, Fair Value Adjustment	(221)		0		(219)		(2,064)
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Receivable, Fair Value Disclosure	0		0		0		0
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Receivable, Fair Value Disclosure	0		0		0		0
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Receivable, Fair Value Disclosure	$ 1,040		$ 7,806		$ 1,040		$ 7,806

[1] 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.

[2] Collateral-dependent impaired loans held at June 30, 2016 that had write-downs in fair value or whose specific reserve changed during the first six months of 2016.