Borrowed Funds (Subordinated Debentures Owed to Unconsolidated Subsidiary Trusts) (Narrative) (Details) (USD $)	0 Months Ended	3 Months Ended		9 Months Ended	12 Months Ended	1 Months Ended
	Aug. 25, 2014	Mar. 31, 2015 trust	Mar. 31, 2014	Sep. 30, 2012	Dec. 31, 2008	Oct. 31, 2002	Mar. 31, 2004	Dec. 31, 2005	Dec. 31, 2014
Debt Instrument [Line Items]
Number of statutory business trusts		3
Subordinated debentures owed to unconsolidated subsidiary trusts		$ 19,589,000	$ 19,589,000						$ 19,589,000	[1]
Net proceeds from issuance of common stock	2,500,000	2,298,000	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						3,500,000
Net proceeds from issuance of common stock						109,000
Payments to acquire debentures						3,610,000
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							7,500,000
Net proceeds from issuance of common stock							232,000
Payments to acquire debentures							7,730,000
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								8,000,000
Net proceeds from issuance of common stock								248,000
Payments to acquire debentures								$ 8,250,000
Basis spread on variable rate								1.45%

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