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Loans Receivable (excluding Covered Loans) (Details) (USD $)	6 Months Ended	12 Months Ended
	Mar. 31, 2012	Sep. 30, 2011	Dec. 31, 2011	Sep. 30, 2010
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 8,031,138,000	$ 8,299,074,000
Ratio of type of loan to total loans receivable	100.00%	100.00%
Allowance for probable losses	143,819,000	157,160,000	154,540,000	163,094,000
Loans in process	133,379,000	170,229,000
Discount on acquired loans	43,687,000	0
Deferred net origination fees	34,236,000	35,808,000
Charges against loans receivable	355,121,000	363,197,000
Loans receivable, net	7,676,017,000	7,935,877,000
Residential Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	5,973,633,000	6,218,878,000
Ratio of type of loan to total loans receivable	74.40%	74.70%
Allowance for probable losses	83,875,000	83,307,000	84,793,000	47,160,000
Construction, Speculative [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	128,858,000	140,459,000
Ratio of type of loan to total loans receivable	1.60%	1.90%
Allowance for probable losses	15,943,000	13,828,000	14,640,000	26,346,000
Construction, Custom [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	235,566,000	279,851,000
Ratio of type of loan to total loans receivable	2.90%	2.90%
Allowance for probable losses	384,000	623,000	457,000	770,000
Land, Acquisition and Development [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	156,457,000	200,692,000
Ratio of type of loan to total loans receivable	2.00%	3.50%
Allowance for probable losses	19,929,000	32,719,000	29,089,000	61,637,000
Land, Consumer Lot Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	149,967,000	163,146,000
Ratio of type of loan to total loans receivable	1.90%	2.10%
Allowance for probable losses	7,712,000	5,520,000	8,283,000	4,793,000
Multi Family Housing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	687,696,000	700,673,000
Ratio of type of loan to total loans receivable	8.50%	7.90%
Allowance for probable losses	4,837,000	7,623,000	6,543,000	5,050,000
Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	394,488,000	303,442,000
Ratio of type of loan to total loans receivable	4.90%	3.60%
Allowance for probable losses	2,869,000	4,331,000	2,739,000	3,165,000
Commercial and Industrial Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	102,684,000	109,332,000
Ratio of type of loan to total loans receivable	1.30%	1.00%
Allowance for probable losses	4,427,000	5,099,000	4,421,000	6,193,000
Home Equity Line of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	130,583,000	115,092,000
Ratio of type of loan to total loans receivable	1.60%	1.30%
Allowance for probable losses	969,000	1,139,000	972,000	586,000
Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	71,206,000	67,509,000
Ratio of type of loan to total loans receivable	0.90%	1.10%
Allowance for probable losses	2,874,000	2,971,000	2,603,000	7,394,000
Non-Acquired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	7,896,828,000	8,299,074,000
Ratio of type of loan to total loans receivable	98.40%	100.00%
Non-Acquired Loans [Member] | Residential Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	5,971,540,000	6,218,878,000
Ratio of type of loan to total loans receivable	74.40%	74.70%
Non-Acquired Loans [Member] | Construction, Speculative [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	128,719,000	140,459,000
Ratio of type of loan to total loans receivable	1.60%	1.90%
Non-Acquired Loans [Member] | Construction, Custom [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	235,566,000	279,851,000
Ratio of type of loan to total loans receivable	2.90%	2.90%
Non-Acquired Loans [Member] | Land, Acquisition and Development [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	151,967,000	200,692,000
Ratio of type of loan to total loans receivable	1.90%	3.50%
Non-Acquired Loans [Member] | Land, Consumer Lot Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	149,967,000	163,146,000
Ratio of type of loan to total loans receivable	1.90%	2.10%
Non-Acquired Loans [Member] | Multi Family Housing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	686,467,000	700,673,000
Ratio of type of loan to total loans receivable	8.50%	7.90%
Non-Acquired Loans [Member] | Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	293,234,000	303,442,000
Ratio of type of loan to total loans receivable	3.70%	3.60%
Non-Acquired Loans [Member] | Commercial and Industrial Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	94,919,000	109,332,000
Ratio of type of loan to total loans receivable	1.20%	1.00%
Non-Acquired Loans [Member] | Home Equity Line of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	113,368,000	115,092,000
Ratio of type of loan to total loans receivable	1.40%	1.30%
Non-Acquired Loans [Member] | Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	71,081,000	67,509,000
Ratio of type of loan to total loans receivable	0.90%	1.10%
Acquired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	134,310,000	0
Ratio of type of loan to total loans receivable	1.60%	0.00%
Acquired Loans [Member] | Residential Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	2,093,000	0
Ratio of type of loan to total loans receivable	0.00%	0.00%
Acquired Loans [Member] | Construction, Speculative [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	139,000	0
Ratio of type of loan to total loans receivable	0.00%	0.00%
Acquired Loans [Member] | Construction, Custom [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	0	0
Ratio of type of loan to total loans receivable	0.00%	0.00%
Acquired Loans [Member] | Land, Acquisition and Development [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	4,490,000	0
Ratio of type of loan to total loans receivable	0.10%	0.00%
Acquired Loans [Member] | Land, Consumer Lot Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	0	0
Ratio of type of loan to total loans receivable	0.00%	0.00%
Acquired Loans [Member] | Multi Family Housing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	1,229,000	0
Ratio of type of loan to total loans receivable	0.00%	0.00%
Acquired Loans [Member] | Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	101,254,000	0
Ratio of type of loan to total loans receivable	1.20%	0.00%
Acquired Loans [Member] | Commercial and Industrial Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	7,765,000	0
Ratio of type of loan to total loans receivable	0.10%	0.00%
Acquired Loans [Member] | Home Equity Line of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	17,215,000	0
Ratio of type of loan to total loans receivable	0.20%	0.00%
Acquired Loans [Member] | Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 125,000	$ 0
Ratio of type of loan to total loans receivable	0.00%	0.00%

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A valuation allowance for financing receivables that are expected to be uncollectible.

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Reflects the cumulative amount of interest and fees paid by borrowers which have not yet been taken into income in conformity with GAAP. Also reflects the amount of unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of acquired loans that are being amortized into income as an adjustment to yield.

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Reflects the aggregate gross carrying amount of all categories of loans and leases held in portfolio, prior to deducting deferred income and the allowance for losses on loans and leases.

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The undisbursed portion of the loan receivable balance (loans in process) which is deducted separately from total loans.

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Reflects the aggregate carrying amount of all categories of loans and leases held in portfolio, net of unearned income and the allowance for losses on loans and leases.

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Discount on Acquired Loans

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Loans and Leases Receivable, Charges to Allowance, Loans in Process and Deferred Fees

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Loans and Leases Receivable, Ratio of Loan Type to All Loans

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