BORROWINGS, SUBORDINATED DEBENTURES AND BROKERED DEPOSITS (Details) (USD $)	6 Months Ended		6 Months Ended	1 Months Ended									6 Months Ended					6 Months Ended		6 Months Ended		6 Months Ended		6 Months Ended		6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2012 Maximum	Mar. 31, 2012 FHLB advances	Jun. 30, 2012 FHLB advances	Jun. 30, 2012 FHLB 3.16% December 11, 2017	Mar. 31, 2012 FHLB 3.16% December 11, 2017	Jun. 30, 2012 FHLB 2.61% January 11, 2018	Mar. 31, 2012 FHLB 2.61% January 11, 2018	Jun. 30, 2012 FHLB secured lines of credit	Jun. 30, 2012 Federal Reserve discount window	Jun. 30, 2012 Unsecured lines of credit	Jun. 30, 2012 Non-recourse notes	Jun. 30, 2012 Subordinated debentures item	Mar. 31, 2012 Trust I and Trust CI	Jun. 30, 2012 Trust CI	Mar. 31, 2012 Trust CI	Jun. 30, 2012 Trust V	Jul. 26, 2012 Trust V	Jun. 30, 2012 Trust VI	Jul. 26, 2012 Trust VI	Jun. 30, 2012 Trust CII	Jul. 26, 2012 Trust CII	Jun. 30, 2012 Trust VII	Jul. 26, 2012 Trust VII	Jun. 30, 2012 Trust CIII	Jul. 26, 2012 Trust CIII	Jun. 30, 2012 Trust I	Mar. 31, 2012 Trust I
Borrowings, subordinated debentures and brokered deposits
Debt termination expense related to prepayment of debt				$ 22,600,000
Redemption of debt				225,000,000			200,000,000		25,000,000						18,600,000		10,300,000												8,300,000
Remaining borrowing capacity										1,200,000,000
Carrying value of securities pledged	79,800,000				25,300,000
Borrowing capacity											337,100,000
Borrowing capacity												45,000,000
Non-recourse debt added through PWE Finance acquisition													15,500,000
Weighted average interest rate on non-recourse debt (as a percent)													6.72%
Weighted average remaining maturity of non-recourse debt													2 years 10 months 2 days
Fixed interest rates (as a percent)						3.16%		2.61%								11.00%												10.60%
Total subordinated debentures	108,250,000	129,271,000																10,310,000		10,310,000		5,155,000		61,856,000		20,619,000
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%
Current Rate (as a percent)																			3.57%		3.52%		3.42%		3.20%		2.16%
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
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
Brokered Deposits
Brokered deposits included in the interest-bearing deposits	$ 35,600,000