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Loans Receivable (excluding Covered Loans) - Schedule of Loans Receivable (excluding Covered Loans) (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | $ 8,669,717 | $ 7,990,545 |
Ratio of type of loan to total loans receivable | 100.00% | 100.00% |
Allowance for probable losses | 112,347 | 116,741 | 133,147
Loans in process | 346,172 | 275,577 |
Discount on acquired loans | 25,391 | 34,143 |
Deferred net origination fees | 37,485 | 36,054 |
Charges against loans receivable | 521,395 | 462,515 |
Loans receivable, net | 8,148,322 | 7,528,030 |
Single-family residential |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 5,572,244 | 5,373,950 |
Ratio of type of loan to total loans receivable | 64.20% | 67.30% |
Allowance for probable losses | 62,763 | 64,184 | 81,815
Construction - speculative |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 140,060 | 130,778 |
Ratio of type of loan to total loans receivable | 1.60% | 1.60% |
Allowance for probable losses | 6,742 | 8,407 | 12,060
Construction - custom |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 385,824 | 302,722 |
Ratio of type of loan to total loans receivable | 4.50% | 3.80% |
Allowance for probable losses | 1,695 | 882 | 347
Land - acquisition & development |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 80,359 | 81,660 |
Ratio of type of loan to total loans receivable | 0.90% | 1.10% |
Allowance for probable losses | 5,592 | 9,165 | 15,598
Land - consumer lot loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 111,130 | 124,984 |
Ratio of type of loan to total loans receivable | 1.30% | 1.50% |
Allowance for probable losses | 3,077 | 3,552 | 4,937
Multi-family |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 920,285 | 835,598 |
Ratio of type of loan to total loans receivable | 10.60% | 10.50% |
Allowance for probable losses | 4,248 | 3,816 | 5,280
Commercial real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 752,957 | 625,293 |
Ratio of type of loan to total loans receivable | 8.70% | 7.90% |
Allowance for probable losses | 7,548 | 5,595 | 1,956
Commercial & industrial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 434,088 | 326,450 |
Ratio of type of loan to total loans receivable | 5.00% | 4.00% |
Allowance for probable losses | 16,527 | 16,614 | 7,626
HELOC |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 134,455 | 133,631 |
Ratio of type of loan to total loans receivable | 1.60% | 1.60% |
Allowance for probable losses | 928 | 1,002 | 965
Consumer |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 138,315 | 55,479 |
Ratio of type of loan to total loans receivable | 1.60% | 0.70% |
Allowance for probable losses | 3,227 | 3,524 | 2,563
Non-acquired loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 8,409,022 | 7,641,266 |
Ratio of type of loan to total loans receivable | 97.20% | 95.60% |
Non-acquired loans | Single-family residential |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 5,560,203 | 5,359,149 |
Ratio of type of loan to total loans receivable | 64.10% | 67.10% |
Non-acquired loans | Construction - speculative |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 140,060 | 130,778 |
Ratio of type of loan to total loans receivable | 1.60% | 1.60% |
Non-acquired loans | Construction - custom |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 385,824 | 302,722 |
Ratio of type of loan to total loans receivable | 4.50% | 3.80% |
Non-acquired loans | Land - acquisition & development |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 77,832 | 77,775 |
Ratio of type of loan to total loans receivable | 0.90% | 1.10% |
Non-acquired loans | Land - consumer lot loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 108,623 | 121,671 |
Ratio of type of loan to total loans receivable | 1.30% | 1.50% |
Non-acquired loans | Multi-family |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 917,286 | 831,684 |
Ratio of type of loan to total loans receivable | 10.60% | 10.40% |
Non-acquired loans | Commercial real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 591,336 | 414,961 |
Ratio of type of loan to total loans receivable | 6.90% | 5.10% |
Non-acquired loans | Commercial & industrial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 379,226 | 243,199 |
Ratio of type of loan to total loans receivable | 4.40% | 3.00% |
Non-acquired loans | HELOC |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 116,042 | 112,186 |
Ratio of type of loan to total loans receivable | 1.40% | 1.40% |
Non-acquired loans | Consumer |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 132,590 | 47,141 |
Ratio of type of loan to total loans receivable | 1.50% | 0.60% |
Acquired loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 184,188 | 250,379 |
Ratio of type of loan to total loans receivable | 2.00% | 3.10% |
Acquired loans | Single-family residential |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 11,716 | 14,468 |
Ratio of type of loan to total loans receivable | 0.10% | 0.20% |
Acquired loans | Construction - speculative |  |  |
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 | Construction - custom |  |  |
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 | Land - acquisition & development |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 905 | 1,489 |
Ratio of type of loan to total loans receivable | 0.00% | 0.00% |
Acquired loans | Land - consumer lot loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 2,507 | 3,313 |
Ratio of type of loan to total loans receivable | 0.00% | 0.00% |
Acquired loans | Multi-family |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 2,999 | 3,914 |
Ratio of type of loan to total loans receivable | 0.00% | 0.10% |
Acquired loans | Commercial real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 97,898 | 133,423 |
Ratio of type of loan to total loans receivable | 1.10% | 1.70% |
Acquired loans | Commercial & industrial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 54,219 | 75,326 |
Ratio of type of loan to total loans receivable | 0.60% | 0.90% |
Acquired loans | HELOC |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 8,274 | 10,179 |
Ratio of type of loan to total loans receivable | 0.10% | 0.10% |
Acquired loans | Consumer |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 5,670 | 8,267 |
Ratio of type of loan to total loans receivable | 0.10% | 0.10% |
Credit-impaired acquired loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 76,507 | 98,900 |
Ratio of type of loan to total loans receivable | 0.80% | 1.30% |
Credit-impaired acquired loans | Single-family residential |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 325 | 333 |
Ratio of type of loan to total loans receivable | 0.00% | 0.00% |
Credit-impaired acquired loans | Construction - speculative |  |  |
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 | Construction - custom |  |  |
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 | Land - acquisition & development |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 1,622 | 2,396 |
Ratio of type of loan to total loans receivable | 0.00% | 0.00% |
Credit-impaired acquired loans | Land - consumer lot loans |  |  |
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 | Multi-family |  |  |
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 | Commercial real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 63,723 | 76,909 |
Ratio of type of loan to total loans receivable | 0.70% | 1.10% |
Credit-impaired acquired loans | Commercial & industrial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 643 | 7,925 |
Ratio of type of loan to total loans receivable | 0.00% | 0.10% |
Credit-impaired acquired loans | HELOC |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 10,139 | 11,266 |
Ratio of type of loan to total loans receivable | 0.10% | 0.10% |
Credit-impaired acquired loans | Consumer |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | $ 55 | $ 71 |
Ratio of type of loan to total loans receivable | 0.00% | 0.00% |

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5074-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6378556&loc=d3e10152-111534 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=25496975&loc=d3e45377-112738 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 9 + 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 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. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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