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Loans Receivable - Schedule of Accounts, Notes, Loans, and Financing Receivable (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2016
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable, gross | $ 12,456,216 | $ 12,201,387 |  |
Ratio of type of loan to total loans receivable | 100.00% | 100.00% |  |
Allowance for loan losses | $ 127,155 | $ 123,073 | $ 118,456 | $ 113,494
Loans in process | 1,175,642 | 1,149,934 |  |
Net deferred fees, costs and discounts | 46,377 | 45,758 |  |
Total loan contra accounts | 1,349,174 | 1,318,765 |  |
Net loans | 11,107,042 | 10,882,622 |  |
Single-family residential |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable, gross | $ 5,693,318 | $ 5,711,004 |  |
Ratio of type of loan to total loans receivable | 45.70% | 46.80% |  |
Allowance for loan losses | $ 35,928 | $ 36,892 | 38,206 | 37,796
Construction |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable, gross | $ 1,710,418 | $ 1,597,996 |  |
Ratio of type of loan to total loans receivable | 13.70% | 13.10% |  |
Allowance for loan losses | $ 25,214 | $ 24,556 | 21,934 | 19,838
Construction - custom |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable, gross | $ 583,580 | $ 602,631 |  |
Ratio of type of loan to total loans receivable | 4.70% | 4.90% |  |
Allowance for loan losses | $ 2,052 | $ 1,944 | 1,110 | 1,080
Land - acquisition & development |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable, gross | $ 136,938 | $ 124,308 |  |
Ratio of type of loan to total loans receivable | 1.10% | 1.00% |  |
Allowance for loan losses | $ 7,355 | $ 6,829 | 6,665 | 6,023
Land - consumer lot loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable, gross | $ 105,086 | $ 104,405 |  |
Ratio of type of loan to total loans receivable | 0.80% | 0.90% |  |
Allowance for loan losses | $ 2,906 | $ 2,649 | 2,501 | 2,535
Multi-family |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable, gross | $ 1,312,695 | $ 1,303,148 |  |
Ratio of type of loan to total loans receivable | 10.50% | 10.70% |  |
Allowance for loan losses | $ 7,904 | $ 7,862 | 7,629 | 6,925
Commercial real estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable, gross | $ 1,436,508 | $ 1,434,610 |  |
Ratio of type of loan to total loans receivable | 11.50% | 11.80% |  |
Allowance for loan losses | $ 11,625 | $ 11,818 | 10,168 | 8,588
Commercial & industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable, gross | $ 1,120,707 | $ 1,093,360 |  |
Ratio of type of loan to total loans receivable | 9.00% | 9.00% |  |
Allowance for loan losses | $ 29,268 | $ 28,524 | 27,736 | 28,008
HELOC |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable, gross | $ 136,995 | $ 144,850 |  |
Ratio of type of loan to total loans receivable | 1.10% | 1.20% |  |
Allowance for loan losses | $ 808 | $ 855 | 832 | 813
Consumer |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable, gross | $ 219,971 | $ 85,075 |  |
Ratio of type of loan to total loans receivable | 1.80% | 0.70% |  |
Allowance for loan losses | $ 4,095 | $ 1,144 | $ 1,675 | $ 1,888

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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=82891408&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=82891408&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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- Definition Amount of deferred fees paid by borrowers and unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of loans that are being amortized into income as an adjustment to yield. 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 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6378536&loc=d3e10092-111533 + Details
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