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Allowance for Losses on Loans - Loans Evaluated for Impairment (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2017
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance Allocation | $ 134,022 | $ 133,086 | $ 129,257 | $ 128,666 | $ 127,576 | $ 123,073
Recorded Investment of Loans | 13,304,743 |  | 12,853,678 |  |  |
Loans Collectively Evaluated for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance Allocation | 133,691 |  | 128,740 |  |  |
Recorded Investment of Loans | $ 12,115,429 |  | $ 11,597,492 |  |  |
Ratio | 1.10% |  | 1.10% |  |  |
Loans Individually Evaluated for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance Allocation | $ 331 |  | $ 517 |  |  |
Recorded Investment of Loans | $ 40,438 |  | $ 60,680 |  |  |
Ratio | 0.80% |  | 0.90% |  |  |
Single-family residential |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance Allocation | $ 31,514 | 31,476 | $ 33,033 | 34,401 | 34,144 | 36,892
Recorded Investment of Loans | 5,873,583 |  | 5,798,966 |  |  |
Single-family residential | Loans Collectively Evaluated for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance Allocation | 31,514 |  | 33,033 |  |  |
Recorded Investment of Loans | $ 5,861,596 |  | $ 5,782,870 |  |  |
Ratio | 0.50% |  | 0.60% |  |  |
Single-family residential | Loans Individually Evaluated for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance Allocation | $ 0 |  | $ 0 |  |  |
Recorded Investment of Loans | $ 16,107 |  | $ 21,345 |  |  |
Ratio | 0.00% |  | 0.00% |  |  |
Construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance Allocation | $ 34,057 | 33,396 | $ 31,317 | 30,133 | 27,389 | 24,556
Recorded Investment of Loans | 1,997,236 |  | 1,890,668 |  |  |
Construction | Loans Collectively Evaluated for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance Allocation | 34,057 |  | 31,317 |  |  |
Recorded Investment of Loans | $ 1,168,667 |  | $ 1,060,428 |  |  |
Ratio | 2.90% |  | 3.00% |  |  |
Construction | Loans Individually Evaluated for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance Allocation | $ 0 |  | $ 0 |  |  |
Recorded Investment of Loans | $ 0 |  | $ 2,427 |  |  |
Ratio | 0.00% |  | 0.00% |  |  |
Construction - custom |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance Allocation | $ 1,884 | 1,976 | $ 1,842 | 2,014 | 2,081 | 1,944
Recorded Investment of Loans | 570,897 |  | 624,479 |  |  |
Construction - custom | Loans Collectively Evaluated for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance Allocation | 1,884 |  | 1,842 |  |  |
Recorded Investment of Loans | $ 293,063 |  | $ 289,192 |  |  |
Ratio | 0.60% |  | 0.60% |  |  |
Construction - custom | Loans Individually Evaluated for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance Allocation | $ 0 |  | $ 0 |  |  |
Recorded Investment of Loans | $ 1,161 |  | $ 0 |  |  |
Ratio | 0.00% |  | 0.00% |  |  |
Land - acquisition & development |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance Allocation | $ 9,388 | 9,734 | $ 7,978 | 7,700 | 7,622 | 6,829
Recorded Investment of Loans | 203,086 |  | 155,204 |  |  |
Land - acquisition & development | Loans Collectively Evaluated for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance Allocation | 9,371 |  | 7,969 |  |  |
Recorded Investment of Loans | $ 160,210 |  | $ 122,639 |  |  |
Ratio | 5.80% |  | 6.50% |  |  |
Land - acquisition & development | Loans Individually Evaluated for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance Allocation | $ 17 |  | $ 9 |  |  |
Recorded Investment of Loans | $ 173 |  | $ 920 |  |  |
Ratio | 9.80% |  | 1.00% |  |  |
Land - consumer lot loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance Allocation | $ 2,032 | 2,076 | $ 2,164 | 2,907 | 2,853 | 2,649
Recorded Investment of Loans | 95,227 |  | 102,036 |  |  |
Land - consumer lot loans | Loans Collectively Evaluated for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance Allocation | 2,032 |  | 2,164 |  |  |
Recorded Investment of Loans | $ 90,629 |  | $ 96,583 |  |  |
Ratio | 2.20% |  | 2.20% |  |  |
Land - consumer lot loans | Loans Individually Evaluated for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance Allocation | $ 0 |  | $ 0 |  |  |
Recorded Investment of Loans | $ 582 |  | $ 507 |  |  |
Ratio | 0.00% |  | 0.00% |  |  |
Multi-family |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance Allocation | $ 7,283 | 7,394 | $ 8,329 | 8,091 | 7,982 | 7,862
Recorded Investment of Loans | 1,403,142 |  | 1,385,125 |  |  |
Multi-family | Loans Collectively Evaluated for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance Allocation | 7,279 |  | 8,325 |  |  |
Recorded Investment of Loans | $ 1,401,288 |  | $ 1,384,655 |  |  |
Ratio | 0.50% |  | 0.60% |  |  |
Multi-family | Loans Individually Evaluated for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance Allocation | $ 4 |  | $ 4 |  |  |
Recorded Investment of Loans | $ 1,832 |  | $ 448 |  |  |
Ratio | 0.20% |  | 1.00% |  |  |
Commercial real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance Allocation | $ 13,004 | 12,448 | $ 11,852 | 11,579 | 11,588 | 11,818
Recorded Investment of Loans | 1,622,943 |  | 1,452,168 |  |  |
Commercial real estate | Loans Collectively Evaluated for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance Allocation | 12,772 |  | 11,702 |  |  |
Recorded Investment of Loans | $ 1,609,208 |  | $ 1,432,791 |  |  |
Ratio | 0.80% |  | 0.80% |  |  |
Commercial real estate | Loans Individually Evaluated for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance Allocation | $ 232 |  | $ 150 |  |  |
Recorded Investment of Loans | $ 13,736 |  | $ 19,378 |  |  |
Ratio | 1.70% |  | 0.80% |  |  |
Commercial & industrial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance Allocation | $ 31,071 | 30,574 | $ 28,702 | 27,515 | 29,330 | 28,524
Recorded Investment of Loans | 1,256,398 |  | 1,140,874 |  |  |
Commercial & industrial | Loans Collectively Evaluated for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance Allocation | 30,993 |  | 28,348 |  |  |
Recorded Investment of Loans | $ 1,250,289 |  | $ 1,126,438 |  |  |
Ratio | 2.50% |  | 2.50% |  |  |
Commercial & industrial | Loans Individually Evaluated for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance Allocation | $ 78 |  | $ 354 |  |  |
Recorded Investment of Loans | $ 6,155 |  | $ 14,437 |  |  |
Ratio | 1.30% |  | 2.50% |  |  |
HELOC |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance Allocation | $ 1,087 | 1,082 | $ 781 | 811 | 802 | 855
Recorded Investment of Loans | 139,914 |  | 130,852 |  |  |
HELOC | Loans Collectively Evaluated for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance Allocation | 1,087 |  | 781 |  |  |
Recorded Investment of Loans | $ 138,269 |  | $ 128,715 |  |  |
Ratio | 0.80% |  | 0.60% |  |  |
HELOC | Loans Individually Evaluated for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance Allocation | $ 0 |  | $ 0 |  |  |
Recorded Investment of Loans | $ 692 |  | $ 1,162 |  |  |
Ratio | 0.00% |  | 0.00% |  |  |
Consumer |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance Allocation | $ 2,702 | $ 2,930 | $ 3,259 | $ 3,515 | $ 3,785 | $ 1,144
Recorded Investment of Loans | 142,317 |  | 173,306 |  |  |
Consumer | Loans Collectively Evaluated for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance Allocation | 2,702 |  | 3,259 |  |  |
Recorded Investment of Loans | $ 142,210 |  | $ 173,181 |  |  |
Ratio | 1.90% |  | 1.90% |  |  |
Consumer | Loans Individually Evaluated for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance Allocation | $ 0 |  | $ 0 |  |  |
Recorded Investment of Loans | $ 0 |  | $ 56 |  |  |
Ratio | 0.00% |  | 0.00% |  |  |

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