Loans Receivable (excluding Covered Loans) (Loans on Non-accrual Status) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Sep. 30, 2012	Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans by portfolio segment	$ 163,116	$ 173,427	$ 185,783
Ratio of nonaccrual loan by portfolio segment to total loans on nonaccrual status	100.00%	100.00%
Residential Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans by portfolio segment	108,570	131,193
Ratio of nonaccrual loan by portfolio segment to total loans on nonaccrual status	66.60%	75.70%
Construction, Speculative [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans by portfolio segment	9,471	10,634
Ratio of nonaccrual loan by portfolio segment to total loans on nonaccrual status	5.80%	6.10%
Construction, Custom [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans by portfolio segment	39	539
Ratio of nonaccrual loan by portfolio segment to total loans on nonaccrual status	0.00%	0.30%
Land, Acquisition and Development [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans by portfolio segment	14,318	13,477
Ratio of nonaccrual loan by portfolio segment to total loans on nonaccrual status	8.80%	7.80%
Land, Consumer Lot Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans by portfolio segment	4,024	5,149
Ratio of nonaccrual loan by portfolio segment to total loans on nonaccrual status	2.50%	3.00%
Multi Family Housing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans by portfolio segment	7,907	4,185
Ratio of nonaccrual loan by portfolio segment to total loans on nonaccrual status	4.80%	2.40%
Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans by portfolio segment	16,958	7,653
Ratio of nonaccrual loan by portfolio segment to total loans on nonaccrual status	10.40%	4.40%
Commercial and Industrial Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans by portfolio segment	987	16
Ratio of nonaccrual loan by portfolio segment to total loans on nonaccrual status	0.60%	0.00%
Home Equity Line of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans by portfolio segment	489	198
Ratio of nonaccrual loan by portfolio segment to total loans on nonaccrual status	0.30%	0.10%
Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans by portfolio segment	$ 353	$ 383
Ratio of nonaccrual loan by portfolio segment to total loans on nonaccrual status	0.20%	0.20%