Borrowed Funds (Narrative) (Details) (USD $)	9 Months Ended		12 Months Ended				1 Months Ended
	Sep. 30, 2014 party	Sep. 30, 2012	Dec. 31, 2009	Dec. 31, 2008	Dec. 31, 2013	Sep. 30, 2013	Oct. 31, 2002 Sfg Capital Trust I [Member]	Mar. 31, 2004 Sfg Capital Trust Ii [Member]	Dec. 31, 2005 Sfg Capital Trust Iii [Member]	Dec. 31, 2009 Director [Member]	Dec. 31, 2009 Unrelated Party One [Member]	Dec. 31, 2009 Unrelated Party Two [Member]	Sep. 30, 2014 Prime Rate [Member]
Debt Instrument [Line Items]
Long-term borrowings	$ 78,466,000				$ 163,516,000	$ 163,540,000
Term Loans	500,000												5,000,000
Interest rate	8.00%
Average interest rate paid on long-term borrowings	4.10%					3.89%
Subordinated debentures	16,800,000		6,800,000	10,000,000	16,800,000	16,800,000				5,000,000	1,000,000	800,000
Number of unrelated parties	2
Subordinated Debt Qualifies As Tier Two Capital Under Federal Reserve Board Guidelines, Debt Maturity Date	5 years
Subordinated Debt Amount Qualifying As Tier Two Capital Reduced By Percent Each Year Until Maturity	20.00%
Subordinated Borrowing, Interest Rate			10.00%
Subordinated Borrowing, Term			10 years	7 years 6 months
Subordinated Borrowing, Not Pre-Payable Within Number Of Years			5 years
Debt Instrument, Basis Spread on Variable Rate	0.50%			2.75%			3.45%	2.80%	1.45%
Subordinated debentures owed to unconsolidated subsidiary trusts	19,589,000				19,589,000	19,589,000
Equity Method Investment, Ownership Percentage	100.00%
Proceeds from Issuance or Sale of Equity							3,500,000	7,500,000	8,000,000
Proceeds from Issuance of Common Stock							109,000	232,000	248,000
Payments to Acquire Investments							$ 3,610,000	$ 7,730,000	$ 8,250,000
Trust Preferred Securities Limited To Tier One Capital Elements, Net Of Goodwill		25.00%