Derivatives and Financial Instruments (Narrative) (Details) (USD $)	12 Months Ended				12 Months Ended	3 Months Ended				12 Months Ended
	Dec. 31, 2012 Designated as hedges [Member] Fair value hedge [Member] Interest rate swaps [Member]	Dec. 31, 2011 Designated as hedges [Member] Fair value hedge [Member] Interest rate swaps [Member]	Dec. 31, 2010 Designated as hedges [Member] Fair value hedge [Member] Interest rate swaps [Member]	Dec. 31, 2010 Designated as hedges [Member] Fair value hedge [Member] Interest rate swaps [Member] Junior subordinated debt [Member]	Dec. 31, 2010 Designated as hedges [Member] Fair value hedge [Member] Interest rate swaps [Member] Junior subordinated debt [Member] Interest expense [Member]	Dec. 31, 2011 CommunityOne [Member] FHLB advance [Member]	Sep. 30, 2011 CommunityOne [Member] FHLB advance [Member]	Dec. 31, 2011 CommunityOne [Member] Designated as hedges [Member] Fair value hedge [Member] Interest rate swaps [Member] FHLB advance [Member]	Sep. 30, 2011 CommunityOne [Member] Designated as hedges [Member] Fair value hedge [Member] Interest rate swaps [Member] FHLB advance [Member]	Dec. 31, 2011 CommunityOne [Member] Designated as hedges [Member] Fair value hedge [Member] Interest rate swaps [Member] FHLB advance [Member]	Dec. 31, 2010 CommunityOne [Member] Designated as hedges [Member] Fair value hedge [Member] Interest rate swaps [Member] FHLB advance [Member]	Dec. 31, 2012 CommunityOne [Member] Designated as hedges [Member] Fair value hedge [Member] Interest rate swaps [Member] FHLB advance [Member]	Mar. 31, 2010 CommunityOne [Member] Designated as hedges [Member] Fair value hedge [Member] Interest rate swaps [Member] FHLB advance [Member] swap
Derivative [Line Items]
Number of interest rate derivatives													4
Derivative notional amount													$ 45,000,000
Derivative terminated								30,000,000	15,000,000
Gain on derivatives terminated								800,000	900,000
Gain (loss) on hedged FHLB advances terminated						1,300,000	(2,000,000)
Net gains (losses) recognized in income	0	(300,000)	300,000							(1,600,000)
Impact on interest expense, decrease (increase)											900,000
Net increase in fair value of derivatives included in earnings					500,000
Fair value of derivatives				$ 0				$ 0		$ 0	$ 1,400,000	$ 0