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Allowance for Losses on Loans - Loans Evaluated for Impairment (Details) - USD ($) $ in Thousands | Jun. 30, 2016 | Mar. 31, 2016 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Sep. 30, 2014
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | $ 111,016 | $ 109,919 | $ 106,829 | $ 105,611 | $ 108,323 | $ 114,591
Loans receivable, gross | 10,572,201 |  | 9,823,270 |  |  |
Single-family residential |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 40,681 | 41,828 | 47,347 | 52,004 | 54,762 | 62,763
Construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 17,662 | 15,726 | 6,680 | 5,933 | 5,445 | 6,742
Construction - custom |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 1,028 | 1,022 | 990 | 985 | 968 | 1,695
Land - acquisition & development |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 6,722 | 7,252 | 5,781 | 5,772 | 7,405 | 5,592
Land - consumer lot loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 2,504 | 2,466 | 2,946 | 2,999 | 3,035 | 3,077
Multi-family |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 6,921 | 6,784 | 5,304 | 5,035 | 4,673 | 4,248
Commercial real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 8,143 | 7,783 | 8,960 | 7,268 | 6,734 | 7,548
Commercial & industrial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 24,396 | 23,824 | 24,980 | 21,662 | 21,146 | 16,527
HELOC |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 856 | 828 | 902 | 864 | 850 | 928
Consumer |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 2,103 | $ 2,406 | 2,939 | $ 3,089 | $ 3,305 | $ 3,227
Loans Collectively Evaluated for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 110,119 |  | 106,554 |  |  |
Loans receivable, gross | $ 9,438,408 |  | $ 8,963,453 |  |  |
Ratio | 1.20% |  | 1.20% |  |  |
Loans Collectively Evaluated for Impairment | Single-family residential |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | $ 39,986 |  | $ 47,073 |  |  |
Loans receivable, gross | $ 5,547,373 |  | $ 5,595,752 |  |  |
Ratio | 0.70% |  | 0.80% |  |  |
Loans Collectively Evaluated for Impairment | Construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | $ 17,662 |  | $ 6,680 |  |  |
Loans receivable, gross | $ 442,437 |  | $ 124,679 |  |  |
Ratio | 4.00% |  | 5.40% |  |  |
Loans Collectively Evaluated for Impairment | Construction - custom |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | $ 1,027 |  | $ 990 |  |  |
Loans receivable, gross | $ 211,215 |  | $ 205,692 |  |  |
Ratio | 0.50% |  | 0.50% |  |  |
Loans Collectively Evaluated for Impairment | Land - acquisition & development |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | $ 6,710 |  | $ 5,781 |  |  |
Loans receivable, gross | $ 87,099 |  | $ 72,602 |  |  |
Ratio | 7.70% |  | 8.00% |  |  |
Loans Collectively Evaluated for Impairment | Land - consumer lot loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | $ 2,504 |  | $ 2,946 |  |  |
Loans receivable, gross | $ 90,983 |  | $ 93,103 |  |  |
Ratio | 2.80% |  | 3.20% |  |  |
Loans Collectively Evaluated for Impairment | Multi-family |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | $ 6,911 |  | $ 5,304 |  |  |
Loans receivable, gross | $ 1,091,709 |  | $ 1,062,194 |  |  |
Ratio | 0.60% |  | 0.50% |  |  |
Loans Collectively Evaluated for Impairment | Commercial real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | $ 7,963 |  | $ 8,960 |  |  |
Loans receivable, gross | $ 848,187 |  | $ 844,691 |  |  |
Ratio | 0.90% |  | 1.10% |  |  |
Loans Collectively Evaluated for Impairment | Commercial & industrial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | $ 24,397 |  | $ 24,980 |  |  |
Loans receivable, gross | $ 832,429 |  | $ 643,577 |  |  |
Ratio | 2.90% |  | 3.90% |  |  |
Loans Collectively Evaluated for Impairment | HELOC |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | $ 856 |  | $ 902 |  |  |
Loans receivable, gross | $ 132,869 |  | $ 126,594 |  |  |
Ratio | 0.60% |  | 0.70% |  |  |
Loans Collectively Evaluated for Impairment | Consumer |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | $ 2,103 |  | $ 2,938 |  |  |
Loans receivable, gross | $ 154,107 |  | $ 194,569 |  |  |
Ratio | 1.40% |  | 1.50% |  |  |
Loans Individually Evaluated for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | $ 897 |  | $ 275 |  |  |
Loans receivable, gross | $ 51,562 |  | $ 85,513 |  |  |
Ratio | 1.70% |  | 0.30% |  |  |
Loans Individually Evaluated for Impairment | Single-family residential |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | $ 693 |  | $ 275 |  |  |
Loans receivable, gross | $ 24,451 |  | $ 51,718 |  |  |
Ratio | 2.80% |  | 0.50% |  |  |
Loans Individually Evaluated for Impairment | Construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | $ 0 |  | $ 0 |  |  |
Loans receivable, gross | $ 0 |  | $ 5,441 |  |  |
Ratio | 0.00% |  | 0.00% |  |  |
Loans Individually Evaluated for Impairment | Construction - custom |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | $ 0 |  | $ 0 |  |  |
Loans receivable, gross | $ 1,125 |  | $ 0 |  |  |
Ratio | 0.00% |  | 0.00% |  |  |
Loans Individually Evaluated for Impairment | Land - acquisition & development |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | $ 13 |  | $ 0 |  |  |
Loans receivable, gross | $ 1,454 |  | $ 2,198 |  |  |
Ratio | 0.90% |  | 0.00% |  |  |
Loans Individually Evaluated for Impairment | Land - consumer lot loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | $ 0 |  | $ 0 |  |  |
Loans receivable, gross | $ 1,238 |  | $ 10,824 |  |  |
Ratio | 0.00% |  | 0.00% |  |  |
Loans Individually Evaluated for Impairment | Multi-family |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | $ 11 |  | $ 0 |  |  |
Loans receivable, gross | $ 1,513 |  | $ 5,348 |  |  |
Ratio | 0.70% |  | 0.00% |  |  |
Loans Individually Evaluated for Impairment | Commercial real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | $ 180 |  | $ 0 |  |  |
Loans receivable, gross | $ 21,313 |  | $ 8,826 |  |  |
Ratio | 0.80% |  | 0.00% |  |  |
Loans Individually Evaluated for Impairment | Commercial & industrial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | $ 0 |  | $ 0 |  |  |
Loans receivable, gross | $ 0 |  | $ 0 |  |  |
Ratio | 0.00% |  | 0.00% |  |  |
Loans Individually Evaluated for Impairment | HELOC |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | $ 0 |  | $ 0 |  |  |
Loans receivable, gross | $ 468 |  | $ 1,072 |  |  |
Ratio | 0.00% |  | 0.00% |  |  |
Loans Individually Evaluated for Impairment | Consumer |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | $ 0 |  | $ 0 |  |  |
Loans receivable, gross | $ 0 |  | $ 86 |  |  |
Ratio | 0.00% |  | 0.00% |  |  |

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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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