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Loans Receivable (excluding Covered Loans) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Sep. 30, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 8,181,174		$ 7,990,545
Ratio of type of loan to total loans receivable	100.00%		100.00%
Allowance for probable losses	114,931	118,158	116,741	133,147
Loans in process	264,946		275,577
Discount on acquired loans	29,286		34,143
Deferred net origination fees	34,902		36,054
Charges against loans receivable	444,065		462,515
Loans receivable, net	7,737,109		7,528,030
Single-Family Residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	5,462,093		5,373,950
Ratio of type of loan to total loans receivable	66.70%		67.30%
Allowance for probable losses	63,348	67,692	64,184	81,815
Construction - Speculative [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	135,001		130,778
Ratio of type of loan to total loans receivable	1.70%		1.60%
Allowance for probable losses	6,773	8,142	8,407	12,060
Construction - Custom [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	354,279		302,722
Ratio of type of loan to total loans receivable	4.30%		3.80%
Allowance for probable losses	1,599	1,474	882	347
Land - Acquisition & Development [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	77,049		81,660
Ratio of type of loan to total loans receivable	0.90%		1.10%
Allowance for probable losses	6,027	7,084	9,165	15,598
Land - Consumer Lot Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	116,864		124,984
Ratio of type of loan to total loans receivable	1.40%		1.50%
Allowance for probable losses	2,974	3,274	3,552	4,937
Multi-Family [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	869,635		835,598
Ratio of type of loan to total loans receivable	10.60%		10.50%
Allowance for probable losses	4,187	4,109	3,816	5,280
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	634,457		625,293
Ratio of type of loan to total loans receivable	7.80%		7.90%
Allowance for probable losses	5,924	5,868	5,595	1,956
Commercial & Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	351,705		326,450
Ratio of type of loan to total loans receivable	4.40%		4.00%
Allowance for probable losses	20,403	16,505	16,614	7,626
HELOC [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	131,852		133,631
Ratio of type of loan to total loans receivable	1.60%		1.60%
Allowance for probable losses	975	943	1,002	965
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	48,239		55,479
Ratio of type of loan to total loans receivable	0.60%		0.70%
Allowance for probable losses	2,721	3,067	3,524	2,563
Non-Acquired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	7,876,985		7,641,266
Ratio of type of loan to total loans receivable	96.20%		95.60%
Non-Acquired Loans [Member] | Single-Family Residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	5,448,587		5,359,149
Ratio of type of loan to total loans receivable	66.50%		67.10%
Non-Acquired Loans [Member] | Construction - Speculative [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	135,001		130,778
Ratio of type of loan to total loans receivable	1.70%		1.60%
Non-Acquired Loans [Member] | Construction - Custom [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	354,279		302,722
Ratio of type of loan to total loans receivable	4.30%		3.80%
Non-Acquired Loans [Member] | Land - Acquisition & Development [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	74,155		77,775
Ratio of type of loan to total loans receivable	0.90%		1.10%
Non-Acquired Loans [Member] | Land - Consumer Lot Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	113,623		121,671
Ratio of type of loan to total loans receivable	1.30%		1.50%
Non-Acquired Loans [Member] | Multi-Family [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	866,097		831,684
Ratio of type of loan to total loans receivable	10.60%		10.40%
Non-Acquired Loans [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	454,246		414,961
Ratio of type of loan to total loans receivable	5.60%		5.10%
Non-Acquired Loans [Member] | Commercial & Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	277,109		243,199
Ratio of type of loan to total loans receivable	3.40%		3.00%
Non-Acquired Loans [Member] | HELOC [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	112,549		112,186
Ratio of type of loan to total loans receivable	1.40%		1.40%
Non-Acquired Loans [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	41,339		47,141
Ratio of type of loan to total loans receivable	0.50%		0.60%
Acquired Non-Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	218,518		250,379
Ratio of type of loan to total loans receivable	2.70%		3.10%
Acquired Non-Impaired Loans [Member] | Single-Family Residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	13,177		14,468
Ratio of type of loan to total loans receivable	0.20%		0.20%
Acquired Non-Impaired Loans [Member] | Construction - Speculative [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 Non-Impaired 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 Non-Impaired Loans [Member] | Land - Acquisition & Development [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	1,135		1,489
Ratio of type of loan to total loans receivable	0.00%		0.00%
Acquired Non-Impaired Loans [Member] | Land - Consumer Lot Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	3,241		3,313
Ratio of type of loan to total loans receivable	0.10%		0.00%
Acquired Non-Impaired Loans [Member] | Multi-Family [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	3,538		3,914
Ratio of type of loan to total loans receivable	0.00%		0.10%
Acquired Non-Impaired Loans [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	112,089		133,423
Ratio of type of loan to total loans receivable	1.30%		1.70%
Acquired Non-Impaired Loans [Member] | Commercial & Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	69,872		75,326
Ratio of type of loan to total loans receivable	0.90%		0.90%
Acquired Non-Impaired Loans [Member] | HELOC [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	8,624		10,179
Ratio of type of loan to total loans receivable	0.10%		0.10%
Acquired Non-Impaired Loans [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	6,842		8,267
Ratio of type of loan to total loans receivable	0.10%		0.10%
Credit Impaired Acquired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	85,671		98,900
Ratio of type of loan to total loans receivable	1.10%		1.30%
Credit Impaired Acquired Loans [Member] | Single-Family Residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	329		333
Ratio of type of loan to total loans receivable	0.00%		0.00%
Credit Impaired Acquired Loans [Member] | Construction - Speculative [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%
Credit Impaired Acquired Loans [Member] | Land - Acquisition & Development [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	1,759		2,396
Ratio of type of loan to total loans receivable	0.00%		0.00%
Credit Impaired Acquired Loans [Member] | Multi-Family [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%
Credit Impaired Acquired Loans [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	68,122		76,909
Ratio of type of loan to total loans receivable	0.90%		1.10%
Credit Impaired Acquired Loans [Member] | Commercial & Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	4,724		7,925
Ratio of type of loan to total loans receivable	0.10%		0.10%
Credit Impaired Acquired Loans [Member] | HELOC [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	10,679		11,266
Ratio of type of loan to total loans receivable	0.10%		0.10%
Credit Impaired Acquired Loans [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 58		$ 71
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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Amount of deferred interest and fee income, 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. Excludes amounts for loans and leases covered under loss sharing agreements.

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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Amount of undisbursed portion of the loan receivable balance (loans in process). Excludes loans and leases covered under loss sharing agreements.

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

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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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