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Allowance for Losses on Loans - Credit Risk Profile Based on Payment Activity (Details) - USD ($) $ in Thousands | Jun. 30, 2016 | Mar. 31, 2016 | Sep. 30, 2015
--- | --- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans receivable, gross | $ 10,572,201 |  | $ 9,823,270
Nonaccrual loans by portfolio segment | 47,349 |  | 67,810
Performing Loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans receivable, gross | $ 10,255,801 |  | $ 9,426,177
Total grade as a % of total net loans | 99.50% |  | 99.30%
Non-Performing Loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans receivable, gross | $ 79,031 | $ 93,329 | $ 128,577
Nonaccrual loans by portfolio segment | $ 47,349 | $ 54,559 | $ 67,810
Grade as a percentage of total gross loans | 0.50% |  | 0.70%
Single-family residential |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Nonaccrual loans by portfolio segment | $ 36,707 |  | $ 59,074
Single-family residential | Performing Loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans receivable, gross | $ 5,556,312 |  | $ 5,592,771
Total grade as a % of total net loans | 99.30% |  | 99.00%
Single-family residential | Non-Performing Loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Nonaccrual loans by portfolio segment | $ 36,707 |  | $ 59,074
Grade as a percentage of total gross loans | 0.70% |  | 1.00%
Construction |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Nonaccrual loans by portfolio segment | $ 0 |  | $ 754
Construction | Performing Loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans receivable, gross | $ 1,016,305 |  | $ 199,755
Total grade as a % of total net loans | 100.00% |  | 99.60%
Construction | Non-Performing Loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Nonaccrual loans by portfolio segment | $ 0 |  | $ 754
Grade as a percentage of total gross loans | 0.00% |  | 0.40%
Construction - custom |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Nonaccrual loans by portfolio segment | $ 506 |  | $ 732
Construction - custom | Performing Loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans receivable, gross | $ 408,610 |  | $ 395,575
Total grade as a % of total net loans | 99.90% |  | 99.80%
Construction - custom | Non-Performing Loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Nonaccrual loans by portfolio segment | $ 506 |  | $ 732
Grade as a percentage of total gross loans | 0.10% |  | 0.20%
Land - acquisition & development |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Nonaccrual loans by portfolio segment | $ 427 |  | $ 0
Land - acquisition & development | Performing Loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans receivable, gross | $ 101,422 |  | $ 94,208
Total grade as a % of total net loans | 99.60% |  | 100.00%
Land - acquisition & development | Non-Performing Loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Nonaccrual loans by portfolio segment | $ 427 |  | $ 0
Grade as a percentage of total gross loans | 0.40% |  | 0.00%
Land - consumer lot loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Nonaccrual loans by portfolio segment | $ 1,105 |  | $ 1,273
Land - consumer lot loans | Performing Loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans receivable, gross | $ 100,626 |  | $ 102,716
Total grade as a % of total net loans | 98.90% |  | 98.80%
Land - consumer lot loans | Non-Performing Loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Nonaccrual loans by portfolio segment | $ 1,105 |  | $ 1,273
Grade as a percentage of total gross loans | 1.10% |  | 1.20%
Multi-family |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Nonaccrual loans by portfolio segment | $ 1,238 |  | $ 2,558
Multi-family | Performing Loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans receivable, gross | $ 1,093,495 |  | $ 1,123,165
Total grade as a % of total net loans | 99.90% |  | 99.80%
Multi-family | Non-Performing Loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Nonaccrual loans by portfolio segment | $ 1,238 |  | $ 2,558
Grade as a percentage of total gross loans | 0.10% |  | 0.20%
Commercial real estate |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Nonaccrual loans by portfolio segment | $ 6,297 |  | $ 2,176
Commercial real estate | Performing Loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans receivable, gross | $ 880,661 |  | $ 984,093
Total grade as a % of total net loans | 99.30% |  | 99.80%
Commercial real estate | Non-Performing Loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Nonaccrual loans by portfolio segment | $ 6,297 |  | $ 2,176
Grade as a percentage of total gross loans | 0.70% |  | 0.20%
Commercial & industrial |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Nonaccrual loans by portfolio segment | $ 521 |  | $ 0
Commercial & industrial | Performing Loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans receivable, gross | $ 809,921 |  | $ 612,836
Total grade as a % of total net loans | 99.90% |  | 100.00%
Commercial & industrial | Non-Performing Loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Nonaccrual loans by portfolio segment | $ 521 |  | $ 0
Grade as a percentage of total gross loans | 0.10% |  | 0.00%
HELOC |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Nonaccrual loans by portfolio segment | $ 548 |  | $ 563
HELOC | Performing Loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans receivable, gross | $ 134,188 |  | $ 127,083
Total grade as a % of total net loans | 99.60% |  | 99.60%
HELOC | Non-Performing Loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Nonaccrual loans by portfolio segment | $ 548 |  | $ 563
Grade as a percentage of total gross loans | 0.40% |  | 0.40%
Consumer |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Nonaccrual loans by portfolio segment | $ 0 |  | $ 680
Consumer | Performing Loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans receivable, gross | $ 154,261 |  | $ 193,975
Total grade as a % of total net loans | 100.00% |  | 99.70%
Consumer | Non-Performing Loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Nonaccrual loans by portfolio segment | $ 0 |  | $ 680
Grade as a percentage of total gross loans | 0.00% |  | 0.30%

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