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Allowance for Losses on Loans - Credit Risk Profile Based on Payment Activity (Details) - USD ($) $ in Thousands | Jun. 30, 2015 | Sep. 30, 2014
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 9,256,701 | $ 8,669,717
Nonaccrual loans by portfolio segment | 65,308 | 87,431
Performing Financing Receivable [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 8,467,685 | $ 8,321,591
Total grade as a % of total net loans | 99.20% | 99.00%
Nonperforming Financing Receivable [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 128,883 | $ 147,311
Total grade as a % of total net loans | 0.90% | 1.00%
Nonaccrual loans by portfolio segment | $ 65,308 | $ 87,431
Grade as a percentage of total gross loans | 0.80% | 1.00%
Single-Family Residential [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 5,568,929 | $ 5,572,244
Nonaccrual loans by portfolio segment | 56,638 | 74,067
Single-Family Residential [Member] | Performing Financing Receivable [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 5,490,303 | $ 5,486,136
Total grade as a % of total net loans | 99.00% | 98.70%
Single-Family Residential [Member] | Nonperforming Financing Receivable [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual loans by portfolio segment | $ 56,638 | $ 74,067
Grade as a percentage of total gross loans | 1.00% | 1.30%
Construction - Speculative [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 181,668 | $ 140,060
Nonaccrual loans by portfolio segment | 762 | 1,477
Construction - Speculative [Member] | Performing Financing Receivable [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 116,949 | $ 138,583
Total grade as a % of total net loans | 99.40% | 98.90%
Construction - Speculative [Member] | Nonperforming Financing Receivable [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual loans by portfolio segment | $ 762 | $ 1,477
Grade as a percentage of total gross loans | 0.60% | 1.10%
Construction - Custom [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 375,425 | $ 385,824
Nonaccrual loans by portfolio segment | 355 | 0
Construction - Custom [Member] | Performing Financing Receivable [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 204,559 | $ 385,824
Total grade as a % of total net loans | 99.80% | 100.00%
Construction - Custom [Member] | Nonperforming Financing Receivable [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual loans by portfolio segment | $ 355 | $ 0
Grade as a percentage of total gross loans | 0.20% | 0.00%
Land - Acquisition & Development [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 90,252 | $ 80,359
Nonaccrual loans by portfolio segment | 0 | 811
Land - Acquisition & Development [Member] | Performing Financing Receivable [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 71,471 | $ 77,021
Total grade as a % of total net loans | 100.00% | 99.00%
Land - Acquisition & Development [Member] | Nonperforming Financing Receivable [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual loans by portfolio segment | $ 0 | $ 811
Grade as a percentage of total gross loans | 0.00% | 1.00%
Land - Consumer Lot Loans [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 105,463 | $ 111,130
Nonaccrual loans by portfolio segment | 1,308 | 2,637
Land - Consumer Lot Loans [Member] | Performing Financing Receivable [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 101,128 | $ 105,986
Total grade as a % of total net loans | 98.40% | 97.60%
Land - Consumer Lot Loans [Member] | Nonperforming Financing Receivable [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual loans by portfolio segment | $ 1,308 | $ 2,637
Grade as a percentage of total gross loans | 1.60% | 2.40%
Multi-Family [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 1,093,374 | $ 920,285
Nonaccrual loans by portfolio segment | 786 | 1,742
Multi-Family [Member] | Performing Financing Receivable [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 1,012,250 | $ 915,544
Total grade as a % of total net loans | 99.80% | 99.80%
Multi-Family [Member] | Nonperforming Financing Receivable [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual loans by portfolio segment | $ 786 | $ 1,742
Grade as a percentage of total gross loans | 0.20% | 0.20%
Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 981,824 | $ 752,957
Nonaccrual loans by portfolio segment | 2,852 | 5,106
Commercial Real Estate [Member] | Performing Financing Receivable [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 693,479 | $ 586,230
Total grade as a % of total net loans | 99.70% | 99.10%
Commercial Real Estate [Member] | Nonperforming Financing Receivable [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual loans by portfolio segment | $ 2,852 | $ 5,106
Grade as a percentage of total gross loans | 0.30% | 0.90%
Commercial & Industrial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 512,973 | $ 434,088
Nonaccrual loans by portfolio segment | 1,205 | 7
Commercial & Industrial [Member] | Performing Financing Receivable [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 450,124 | $ 379,219
Total grade as a % of total net loans | 99.80% | 100.00%
Commercial & Industrial [Member] | Nonperforming Financing Receivable [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual loans by portfolio segment | $ 1,205 | $ 7
Grade as a percentage of total gross loans | 0.20% | 0.00%
HELOC [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 137,837 | $ 134,455
Nonaccrual loans by portfolio segment | 889 | 795
HELOC [Member] | Performing Financing Receivable [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 121,985 | $ 115,247
Total grade as a % of total net loans | 99.30% | 99.30%
HELOC [Member] | Nonperforming Financing Receivable [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual loans by portfolio segment | $ 889 | $ 795
Grade as a percentage of total gross loans | 0.70% | 0.70%
Consumer [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 208,956 | $ 138,315
Nonaccrual loans by portfolio segment | 513 | 789
Consumer [Member] | Performing Financing Receivable [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 205,437 | $ 131,801
Total grade as a % of total net loans | 99.80% | 99.40%
Consumer [Member] | Nonperforming Financing Receivable [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Nonaccrual loans by portfolio segment | $ 513 | $ 789
Grade as a percentage of total gross loans | 0.20% | 0.60%

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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 Reflects the carrying amount of loans deemed to be questionable as to collection on which no interest is continuing to be recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5111-111524 + Details
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