Borrowed Funds (Subordinated Debentures Owed to Unconsolidated Subsidiary Trusts) (Narrative) (Details) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2017 USD ($) trust	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Debt Instrument [Line Items]
Number of statutory business trusts | trust	3
Subordinated debentures owed to unconsolidated subsidiary trusts	$ 19,589	$ 19,589	$ 19,589	[1]
Net proceeds from issuance of common stock	$ (43)	$ 75
Basis spread on variable rate			0.50%
Trust preferred securities limited to tier one capital elements, net of goodwill	25.00%

[1] Derived from audited consolidated financial statements