Loans Loans (Troubled Debt Restructurings Type of Modification) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Financing Receivable, Modifications [Line Items]
Troubled debt restructuring, pre-modification recorded investment	[1]	$ 0	$ 3,683	$ 0	$ 3,683
Below market interest rate concession [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructuring, pre-modification recorded investment		0	0	0	0
Payment deferral [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructuring, pre-modification recorded investment		0	0	0	0
Maturity / amortization concession [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructuring, pre-modification recorded investment		0	133	0	133
Interest only payments [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructuring, pre-modification recorded investment		$ 0	$ 3,550	$ 0	$ 3,550

[1] The recorded investment in troubled debt restructurings consists of unpaid principal balance, net of charge-offs and unamortized deferred loan origination fees and costs, at the time of the restructuring. For accruing troubled debt restructured loans, the recorded investment also includes accrued interest.