Loans (Troubled Debt Restructurings Type of Modification) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Modifications [Line Items]
Pre-Modification Recorded Investment	[1]	$ 0	$ 11,391
Below-market interest rate concession [Member]
Financing Receivable, Modifications [Line Items]
Pre-Modification Recorded Investment		0	0
Payment deferral [Member]
Financing Receivable, Modifications [Line Items]
Pre-Modification Recorded Investment		0	1,111
Maturity / amortization concession [Member]
Financing Receivable, Modifications [Line Items]
Pre-Modification Recorded Investment		0	683
Interest only payments [Member]
Financing Receivable, Modifications [Line Items]
Pre-Modification Recorded Investment		0	4,326
Combination [Member]
Financing Receivable, Modifications [Line Items]
Pre-Modification Recorded Investment	[2]	$ 0	$ 5,271

[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.