BORROWINGS AND SUBORDINATED DEBENTURES (Details) (USD $)	12 Months Ended		12 Months Ended	1 Months Ended			12 Months Ended									12 Months Ended								12 Months Ended				12 Months Ended				12 Months Ended				12 Months Ended				12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Maximum	Mar. 31, 2012 FHLB advances	Dec. 31, 2010 FHLB advances	Apr. 30, 2010 FHLB advances	Dec. 31, 2010 FHLB advances	Dec. 31, 2012 FHLB advances	Dec. 31, 2011 FHLB advances	Dec. 31, 2012 FHLB 3.16% December 11, 2017	Mar. 31, 2012 FHLB 3.16% December 11, 2017	Dec. 31, 2011 FHLB 3.16% December 11, 2017	Dec. 31, 2012 FHLB 2.61% January 11, 2018	Mar. 31, 2012 FHLB 2.61% January 11, 2018	Dec. 31, 2011 FHLB 2.61% January 11, 2018	Dec. 31, 2012 FHLB secured lines of credit item	Dec. 31, 2012 Non-recourse notes	Dec. 31, 2012 Subordinated debentures item	Mar. 31, 2012 Trust I and Trust CI	Dec. 31, 2012 Trust CI	Mar. 31, 2012 Trust CI	Jan. 27, 2012 Trust CI	Dec. 31, 2011 Trust CI	Dec. 31, 2012 Trust V	Jan. 28, 2013 Trust V	Jan. 27, 2012 Trust V	Dec. 31, 2011 Trust V	Dec. 31, 2012 Trust VI	Jan. 28, 2013 Trust VI	Jan. 27, 2012 Trust VI	Dec. 31, 2011 Trust VI	Dec. 31, 2012 Trust CII	Jan. 28, 2013 Trust CII	Jan. 27, 2012 Trust CII	Dec. 31, 2011 Trust CII	Dec. 31, 2012 Trust VII	Jan. 28, 2013 Trust VII	Jan. 27, 2012 Trust VII	Dec. 31, 2011 Trust VII	Dec. 31, 2012 Trust CIII	Jan. 28, 2013 Trust CIII	Jan. 27, 2012 Trust CIII	Dec. 31, 2011 Trust CIII	Dec. 31, 2012 Trust I	Mar. 31, 2012 Trust I	Jan. 27, 2012 Trust I	Dec. 31, 2011 Trust I	Dec. 31, 2012 Bank Federal Reserve discount window	Dec. 31, 2012 Bank Unsecured lines of credit	Dec. 31, 2011 Bank Unsecured lines of credit	Dec. 31, 2010 Bank Unsecured lines of credit
Borrowings, subordinated debentures and brokered deposits
Debt termination expense related to prepayment of debt				$ 22,600,000			$ 2,700,000
Redemption of debt				225,000,000							200,000,000			25,000,000					18,600,000		10,300,000																								8,300,000
Prepayment of debt					50,000,000	125,000,000	175,000,000
Prepayment penalties					1,900,000	726,000
Borrowing capacity																																																484,000,000	65,000,000	45,000,000	52,000,000
Construction and commercial loans pledged as collateral																																																385,700,000
Number of FHLB programs																2
Number of FHLB programs collateralized by loans																1
Carrying value of securities pledged																18,900,000
Fixed interest rates (as a percent)										0.00%		3.16%	0.00%		2.61%					11.00%																								10.60%
Outstanding FHLB advances								0	225,000,000	0		200,000,000	0		25,000,000
Non-recourse debt																	12,600,000
Weighted average interest rate on non-recourse debt (as a percent)																	6.28%
Weighted average remaining maturity of non-recourse debt																	2 years 6 months
Number of series of subordinated debentures issued																		5
Maturity period of debt from the date of issue																		30 years
Amount of trust preferred securities issued	105,000,000
Trust preferred securities included in Tier I capital, as a percentage of sum of core capital elements			25.00%
Trust preferred securities included in Tier I capital	105,000,000
Maturity period of trust preferred securities included in Tier I capital	10 years																	10 years
Number of months for which cumulative net earnings are not sufficient for dividend payments due for those periods, requiring prior notification to FRB	12 months																	12 months
Gross subordinated debentures	108,250,000	126,808,000																					10,310,000	10,310,000			10,310,000	10,310,000			10,310,000	5,155,000			5,155,000	61,856,000			61,856,000	20,619,000			20,619,000				8,248,000
Unamortized premium		2,463,000
Net subordinated debentures	$ 108,250,000	$ 129,271,000
Current Rate (as a percent)																						11.00%			3.41%	3.66%			3.36%	3.60%			3.26%	3.51%			3.05%	3.30%			2.00%	2.24%				10.60%
Rate Index																								3 month LIBOR				3 month LIBOR				3 month LIBOR				3 month LIBOR				3 month LIBOR
Spread on variable rate (as a percent)																								3.10%				3.05%				2.95%				2.75%				1.69%