Borrowed Funds (Subordinated Debentures Owed to Unconsolidated Subsidiary Trusts) (Narrative) (Details) $ in Thousands		1 Months Ended			6 Months Ended		12 Months Ended
	Aug. 25, 2014 USD ($)	Dec. 31, 2005 USD ($)	Mar. 31, 2004 USD ($)	Oct. 31, 2002 USD ($)	Jun. 30, 2015 USD ($) trust	Jun. 30, 2014 USD ($)	Dec. 31, 2008	Dec. 31, 2014 USD ($)	[1]
Debt Instrument [Line Items]
Number of statutory business trusts | trust					3
Subordinated debentures owed to unconsolidated subsidiary trusts					$ 19,589	$ 19,589		$ 19,589
Net proceeds from issuance of common stock	$ 2,500				$ 4,741	$ 0
Basis spread on variable rate					0.50%		2.75%
Trust preferred securities limited to tier one capital elements, net of goodwill					25.00%
Sfg Capital Trust I [Member]
Debt Instrument [Line Items]
Ownership percentage				100.00%
Proceeds from issuance or sale of equity				$ 3,500
Net proceeds from issuance of common stock				109
Payments to acquire debentures				$ 3,610
Basis spread on variable rate				3.45%
Sfg Capital Trust Ii [Member]
Debt Instrument [Line Items]
Ownership percentage			100.00%
Proceeds from issuance or sale of equity			$ 7,500
Net proceeds from issuance of common stock			232
Payments to acquire debentures			$ 7,730
Basis spread on variable rate			2.80%
Sfg Capital Trust Iii [Member]
Debt Instrument [Line Items]
Ownership percentage		100.00%
Proceeds from issuance or sale of equity		$ 8,000
Net proceeds from issuance of common stock		248
Payments to acquire debentures		$ 8,250
Basis spread on variable rate		1.45%

[1] December 31, 2014 financial information has been extracted from audited consolidated financial statements