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Allowance for Losses on Loans - Loans Collectively and Individually Evaluated for Impairment (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012
--- | --- | --- | ---
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
General/specific reserve allocation | $ 112,347 |  | $ 116,741 |  | $ 133,147
Gross loans subject to general/specific reserve | 8,669,717 |  | 7,990,545 |  |
Single-family residential |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
General/specific reserve allocation | 62,763 |  | 64,184 |  | 81,815
Gross loans subject to general/specific reserve | 5,572,244 |  | 5,373,950 |  |
Construction - speculative |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
General/specific reserve allocation | 6,742 |  | 8,407 |  | 12,060
Gross loans subject to general/specific reserve | 140,060 |  | 130,778 |  |
Construction - custom |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
General/specific reserve allocation | 1,695 |  | 882 |  | 347
Gross loans subject to general/specific reserve | 385,824 |  | 302,722 |  |
Land - acquisition & development |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
General/specific reserve allocation | 5,592 |  | 9,165 |  | 15,598
Gross loans subject to general/specific reserve | 80,359 |  | 81,660 |  |
Land - consumer lot loans |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
General/specific reserve allocation | 3,077 |  | 3,552 |  | 4,937
Gross loans subject to general/specific reserve | 111,130 |  | 124,984 |  |
Multi-family |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
General/specific reserve allocation | 4,248 |  | 3,816 |  | 5,280
Gross loans subject to general/specific reserve | 920,285 |  | 835,598 |  |
Commercial real estate |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
General/specific reserve allocation | 7,548 |  | 5,595 |  | 1,956
Gross loans subject to general/specific reserve | 752,957 |  | 625,293 |  |
Commercial & industrial |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
General/specific reserve allocation | 16,527 |  | 16,614 |  | 7,626
Gross loans subject to general/specific reserve | 434,088 |  | 326,450 |  |
HELOC |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
General/specific reserve allocation | 928 |  | 1,002 |  | 965
Gross loans subject to general/specific reserve | 134,455 |  | 133,631 |  |
Consumer |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
General/specific reserve allocation | 3,227 |  | 3,524 |  | 2,563
Gross loans subject to general/specific reserve | 138,315 |  | 55,479 |  |
Loans Collectively Evaluated for Impairment |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
General/specific reserve allocation | 112,287 |  | 113,268 |  |
Gross loans subject to general/specific reserve | 8,316,874 | [1] | 7,495,504 | [1] |
Ratio | 1.40% |  | 1.50% |  |
Loans Collectively Evaluated for Impairment | Single-family residential |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
General/specific reserve allocation | 62,067 |  | 64,184 |  |
Gross loans subject to general/specific reserve | 5,487,331 | [1] | 5,262,159 | [1] |
Ratio | 1.10% |  | 1.20% |  |
Loans Collectively Evaluated for Impairment | Construction - speculative |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
General/specific reserve allocation | 6,682 |  | 7,307 |  |
Gross loans subject to general/specific reserve | 130,901 | [1] | 115,554 | [1] |
Ratio | 5.50% |  | 6.30% |  |
Loans Collectively Evaluated for Impairment | Construction - custom |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
General/specific reserve allocation | 1,695 |  | 882 |  |
Gross loans subject to general/specific reserve | 385,464 | [1] | 302,722 | [1] |
Ratio | 0.50% |  | 0.30% |  |
Loans Collectively Evaluated for Impairment | Land - acquisition & development |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
General/specific reserve allocation | 5,592 |  | 6,943 |  |
Gross loans subject to general/specific reserve | 73,999 | [1] | 67,521 | [1] |
Ratio | 7.60% |  | 10.30% |  |
Loans Collectively Evaluated for Impairment | Land - consumer lot loans |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
General/specific reserve allocation | 3,077 |  | 3,506 |  |
Gross loans subject to general/specific reserve | 95,684 | [1] | 107,216 | [1] |
Ratio | 3.20% |  | 3.30% |  |
Loans Collectively Evaluated for Impairment | Multi-family |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
General/specific reserve allocation | 4,248 |  | 3,711 |  |
Gross loans subject to general/specific reserve | 911,162 | [1] | 824,279 | [1] |
Ratio | 0.50% |  | 0.50% |  |
Loans Collectively Evaluated for Impairment | Commercial real estate |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
General/specific reserve allocation | 7,548 |  | 5,595 |  |
Gross loans subject to general/specific reserve | 563,534 | [1] | 400,789 | [1] |
Ratio | 1.40% |  | 1.40% |  |
Loans Collectively Evaluated for Impairment | Commercial & industrial |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
General/specific reserve allocation | 17,223 |  | 16,614 |  |
Gross loans subject to general/specific reserve | 421,816 | [1] | 256,954 | [1] |
Ratio | 4.60% |  | 6.50% |  |
Loans Collectively Evaluated for Impairment | HELOC |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
General/specific reserve allocation | 928 |  | 1,002 |  |
Gross loans subject to general/specific reserve | 114,393 | [1] | 111,169 | [1] |
Ratio | 0.90% |  | 0.90% |  |
Loans Collectively Evaluated for Impairment | Consumer |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
General/specific reserve allocation | 3,227 |  | 3,524 |  |
Gross loans subject to general/specific reserve | 132,590 | [1] | 47,141 | [1] |
Ratio | 2.40% |  | 7.50% |  |
Loans Individually Evaluated for Impairment |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
General/specific reserve allocation | 60 |  | 3,473 |  |
Gross loans subject to general/specific reserve | 134,736 | [1] | 159,564 | [1] |
Ratio | 0.00% |  | 2.20% |  |
Loans Individually Evaluated for Impairment | Single-family residential |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
General/specific reserve allocation | 0 |  | 0 |  |
Gross loans subject to general/specific reserve | 72,869 | [1] | 96,989 | [1] |
Ratio | 0.00% |  | 0.00% |  |
Loans Individually Evaluated for Impairment | Construction - speculative |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
General/specific reserve allocation | 60 |  | 1,100 |  |
Gross loans subject to general/specific reserve | 9,159 | [1] | 15,224 | [1] |
Ratio | 0.70% |  | 7.20% |  |
Loans Individually Evaluated for Impairment | Construction - custom |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
General/specific reserve allocation | 0 |  | 0 |  |
Gross loans subject to general/specific reserve | 360 | [1] | 0 | [1] |
Ratio | 0.00% |  | 0.00% |  |
Loans Individually Evaluated for Impairment | Land - acquisition & development |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
General/specific reserve allocation | 0 |  | 2,222 |  |
Gross loans subject to general/specific reserve | 3,833 | [1] | 10,254 | [1] |
Ratio | 0.00% |  | 21.70% |  |
Loans Individually Evaluated for Impairment | Land - consumer lot loans |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
General/specific reserve allocation | 0 |  | 46 |  |
Gross loans subject to general/specific reserve | 12,939 | [1] | 14,455 | [1] |
Ratio | 0.00% |  | 0.30% |  |
Loans Individually Evaluated for Impairment | Multi-family |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
General/specific reserve allocation | 0 |  | 105 |  |
Gross loans subject to general/specific reserve | 6,124 | [1] | 7,405 | [1] |
Ratio | 0.00% |  | 1.40% |  |
Loans Individually Evaluated for Impairment | Commercial real estate |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
General/specific reserve allocation | 0 |  | 0 |  |
Gross loans subject to general/specific reserve | 27,802 | [1] | 14,172 | [1] |
Ratio | 0.00% |  | 0.00% |  |
Loans Individually Evaluated for Impairment | Commercial & industrial |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
General/specific reserve allocation | 0 |  | 0 |  |
Gross loans subject to general/specific reserve | 0 | [1] | 48 | [1] |
Ratio | 0.00% |  | 0.00% |  |
Loans Individually Evaluated for Impairment | HELOC |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
General/specific reserve allocation | 0 |  | 0 |  |
Gross loans subject to general/specific reserve | 1,650 | [1] | 1,017 | [1] |
Ratio | 0.00% |  | 0.00% |  |
Loans Individually Evaluated for Impairment | Consumer |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
General/specific reserve allocation | 0 |  | 0 |  |
Gross loans subject to general/specific reserve | $ 0 | [1] | $ 0 | [1] |
Ratio | 0.00% |  | 0.00% |  |
[1] | Excludes acquired loans with discounts sufficient to absorb potential losses and covered loans

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- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953423-111524 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522 + Details
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- Definition Allowance as a Percentage of Outstanding Loans and Leases + References No definition available. + Details
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