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Allowance for Losses on Loans - Loans Collectively and Individually Evaluated for Impairment (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
--- | --- | --- | ---
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Specific reserves on impaired loans | $ 366 |  | $ 275 |  |
Amount of related allowance included in general reserves | 3,549 |  | 6,403 |  |
General/specific reserve allocation | 113,494 |  | 106,829 |  | $ 114,591
Gross loans subject to general/specific reserve | 10,950,608 |  | 9,823,270 |  |
Single-family residential |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
General/specific reserve allocation | 37,796 |  | 47,347 |  | 62,763
Gross loans subject to general/specific reserve | 5,658,827 |  |  |  |
Construction |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
General/specific reserve allocation | 19,838 |  | 6,680 |  | 6,742
Gross loans subject to general/specific reserve | 1,110,411 |  |  |  |
Construction - custom |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
General/specific reserve allocation | 1,080 |  | 990 |  | 1,695
Gross loans subject to general/specific reserve | 473,069 |  |  |  |
Land - acquisition & development |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
General/specific reserve allocation | 6,023 |  | 5,781 |  | 5,592
Gross loans subject to general/specific reserve | 118,497 |  |  |  |
Land - consumer lot loans |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
General/specific reserve allocation | 2,535 |  | 2,946 |  | 3,077
Gross loans subject to general/specific reserve | 104,568 |  |  |  |
Multi-family |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
General/specific reserve allocation | 6,925 |  | 5,304 |  | 4,248
Gross loans subject to general/specific reserve | 1,124,289 |  |  |  |
Commercial real estate |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
General/specific reserve allocation | 8,588 |  | 8,960 |  | 7,548
Gross loans subject to general/specific reserve | 1,093,639 |  |  |  |
Commercial & industrial |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
General/specific reserve allocation | 28,008 |  | 24,980 |  | 16,527
Gross loans subject to general/specific reserve | 978,589 |  |  |  |
HELOC |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
General/specific reserve allocation | 813 |  | 902 |  | 928
Gross loans subject to general/specific reserve | 149,717 |  |  |  |
Consumer |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
General/specific reserve allocation | 1,888 |  | 2,939 |  | $ 3,227
Gross loans subject to general/specific reserve | 139,002 |  |  |  |
Loans Collectively Evaluated for Impairment |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
General/specific reserve allocation | 113,128 |  | 106,554 |  |
Gross loans subject to general/specific reserve | $ 9,784,140 | [1] | $ 8,963,453 | [2] |
Ratio | 1.20% |  | 1.20% |  |
Loans Collectively Evaluated for Impairment | Single-family residential |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
General/specific reserve allocation | $ 37,536 |  | $ 47,073 |  |
Gross loans subject to general/specific reserve | $ 5,585,912 |  | $ 5,595,752 |  |
Ratio | 0.70% |  | 0.80% |  |
Loans Collectively Evaluated for Impairment | Construction |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
General/specific reserve allocation | $ 19,838 |  | $ 6,680 |  |
Gross loans subject to general/specific reserve | $ 498,450 |  | $ 124,679 |  |
Ratio | 4.00% |  | 5.40% |  |
Loans Collectively Evaluated for Impairment | Construction - custom |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
General/specific reserve allocation | $ 1,080 |  | $ 990 |  |
Gross loans subject to general/specific reserve | $ 229,298 |  | $ 205,692 |  |
Ratio | 0.50% |  | 0.50% |  |
Loans Collectively Evaluated for Impairment | Land - acquisition & development |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
General/specific reserve allocation | $ 6,022 |  | $ 5,781 |  |
Gross loans subject to general/specific reserve | $ 90,850 |  | $ 72,602 |  |
Ratio | 6.60% |  | 8.00% |  |
Loans Collectively Evaluated for Impairment | Land - consumer lot loans |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
General/specific reserve allocation | $ 2,535 |  | $ 2,946 |  |
Gross loans subject to general/specific reserve | $ 92,828 |  | $ 93,103 |  |
Ratio | 2.70% |  | 3.20% |  |
Loans Collectively Evaluated for Impairment | Multi-family |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
General/specific reserve allocation | $ 6,911 |  | $ 5,304 |  |
Gross loans subject to general/specific reserve | $ 1,091,974 |  | $ 1,062,194 |  |
Ratio | 0.60% |  | 0.50% |  |
Loans Collectively Evaluated for Impairment | Commercial real estate |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
General/specific reserve allocation | $ 8,497 |  | $ 8,960 |  |
Gross loans subject to general/specific reserve | $ 957,380 |  | $ 844,691 |  |
Ratio | 0.90% |  | 1.10% |  |
Loans Collectively Evaluated for Impairment | Commercial & industrial |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
General/specific reserve allocation | $ 28,008 |  | $ 24,980 |  |
Gross loans subject to general/specific reserve | $ 966,930 |  | $ 643,577 |  |
Ratio | 2.90% |  | 3.90% |  |
Loans Collectively Evaluated for Impairment | HELOC |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
General/specific reserve allocation | $ 813 |  | $ 902 |  |
Gross loans subject to general/specific reserve | $ 133,203 |  | $ 126,594 |  |
Ratio | 0.60% |  | 0.70% |  |
Loans Collectively Evaluated for Impairment | Consumer |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
General/specific reserve allocation | $ 1,888 |  | $ 2,938 |  |
Gross loans subject to general/specific reserve | $ 137,315 |  | $ 194,569 |  |
Ratio | 1.40% |  | 1.50% |  |
Loans Individually Evaluated for Impairment |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
General/specific reserve allocation | $ 366 |  | $ 275 |  |
Gross loans subject to general/specific reserve | $ 34,271 | [1] | $ 85,513 | [2] |
Ratio | 1.10% |  | 0.30% |  |
Loans Individually Evaluated for Impairment | Single-family residential |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
General/specific reserve allocation | $ 260 |  | $ 275 |  |
Gross loans subject to general/specific reserve | $ 19,629 |  | $ 51,718 |  |
Ratio | 1.30% |  | 0.50% |  |
Loans Individually Evaluated for Impairment | Construction |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
General/specific reserve allocation | $ 0 |  | $ 0 |  |
Gross loans subject to general/specific reserve | $ 0 |  | $ 5,441 |  |
Ratio | 0.00% |  | 0.00% |  |
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 | $ 330 |  | $ 0 |  |
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 | $ 2 |  | $ 0 |  |
Gross loans subject to general/specific reserve | $ 850 |  | $ 2,198 |  |
Ratio | 0.20% |  | 0.00% |  |
Loans Individually Evaluated for Impairment | Land - consumer lot loans |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
General/specific reserve allocation | $ 0 |  | $ 0 |  |
Gross loans subject to general/specific reserve | $ 558 |  | $ 10,824 |  |
Ratio | 0.00% |  | 0.00% |  |
Loans Individually Evaluated for Impairment | Multi-family |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
General/specific reserve allocation | $ 13 |  | $ 0 |  |
Gross loans subject to general/specific reserve | $ 1,505 |  | $ 5,348 |  |
Ratio | 0.90% |  | 0.00% |  |
Loans Individually Evaluated for Impairment | Commercial real estate |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
General/specific reserve allocation | $ 91 |  | $ 0 |  |
Gross loans subject to general/specific reserve | $ 11,157 |  | $ 8,826 |  |
Ratio | 0.80% |  | 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 |  | $ 0 |  |
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 | $ 239 |  | $ 1,072 |  |
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 | $ 3 |  | $ 86 |  |
Ratio | 0.00% |  | 0.00% |  |
[1] | Excludes acquired loans with discounts sufficient to absorb potential losses and covered loans
[2] | 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=66008989&loc=SL6953423-111524 + Details
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- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + 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 (g) -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524 + Details
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- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + 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 (g) -URI http://asc.fasb.org/extlink&oid=66008989&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=65884687&loc=d3e4428-111522 + Details
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