Loans Loans (Troubled Debt Restructurings Type of Modification) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Financing Receivable, Modifications [Line Items]
Troubled debt restructuring, pre-modification recorded investment	[1]	$ 0	$ 914	$ 0	$ 4,597
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	324	0	457
Interest only payments [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructuring, pre-modification recorded investment		0	0	0	3,550
Combination [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructuring, pre-modification recorded investment	[2]	$ 0	$ 590	$ 0	$ 590

[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.

[2] Loans included in this classification were modified with a combination of any two of the concessions listed in this table.