Loans Receivable, Net (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012	Apr. 30, 2012 Subsidiary
Loans Receivable, Net (Textual) [Abstract]
Percentage of consolidated stockholders equity exceeding which no borrower had outstanding loans or commitments	10.00%
Net deferred fees, premiums, and discounts included in the loan receivable	$ 1,379,000	$ 3,123,000
Variable rate loans	2,295,167,000
Fixed rate loans	1,102,258,000
Weighted average interest rate on loans	5.33%	5.62%
Loan sold and serviced for others	116,439,000	160,465,000	173,446,000
Loans pledged as collateral	1,660,469,000
Aggregate amount of loans outstanding to related parties	33,869,000	89,089,000
New loans to related parties	8,386,000
Repayments of loans by related parties	4,736,000
Number of Bank Subsidiaries Prior to Charter Consolidation					11
Balance at beginning of period	137,516,000	137,107,000	142,927,000	130,854,000
Provision for loan losses	21,525,000	64,500,000	84,693,000
Charge-offs	(34,672,000)	(69,366,000)	(93,950,000)
Recoveries	6,485,000	5,275,000	3,437,000
Interest income that would have been recorded on non-accrual loans	5,161,000	7,441,000	10,987,000
Percentage of TDRs occurring in each class as a result of extensions of maturity date	49.00%	58.00%
TDR With Pre Modification Loan Balance for Which Oreo Was Received	39,769,000	96,528,000
Additional outstanding commitments on TDRs	4,534,000	3,158,000
Charge-offs on TDRs	$ 6,271,000	$ 8,792,000
Commercial Real Estate [Member]
Loans Receivable, Net (Textual) [Abstract]
Percentage of TDRs occurring in each class as a result of extensions of maturity date	36.00%	56.00%
Percentage of TDRs Resulting of Combination of Interest Rate Reduction Extension of Maturity Date or Reduction in Face Amount	30.00%	31.00%