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Allowance for Losses on Loans - ASU and Change in Accounting Principle (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Oct. 01, 2019 | Sep. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  |  | $ 134,022 |  | $ 134,022 | $ 165,349 | $ 157,101 | $ 147,513 |  | $ 131,534 | $ 133,086 | $ 129,257
Reserve for unfunded commitments |  |  |  |  |  |  | 19,500 | 18,650 | 18,250 |  | 6,900 |  |
Total allowance for credit losses | $ 175,751 | $ 175,751 | $ 165,763 |  | $ 184,849 |  | 184,849 | 175,751 | 165,763 | $ 166,934 | 138,434 |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance | 175,751 | 165,763 | 138,434 |  | 138,434 |  |  |  |  |  |  |  |
Net (charge-offs) recoveries | (1,702) | 1,788 | 2,579 | 936 | 2,665 | 3,515 |  |  |  |  |  |  |
Net provision (release) | 10,800 | 8,200 | (3,750) |  |  |  |  |  |  |  |  |  |
Ending balance | $ 184,849 | $ 175,751 | $ 165,763 |  | $ 184,849 |  |  |  |  |  |  |  |
Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  |  |  |  |  |  |  |  | 149,284 |  |  |
Reserve for unfunded commitments |  |  |  |  |  |  |  |  |  | 17,650 |  |  |
Total allowance for credit losses |  |  |  |  |  |  |  |  |  | 166,934 |  |  |
Commercial loans |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  |  | 94,803 |  | 94,803 | 106,408 | 98,704 | 89,581 |  | 93,470 | 93,546 | 88,178
Commercial loans | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  |  |  |  |  |  |  |  | 89,335 |  |  |
Commercial loans | Multi-family |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  |  | 7,283 |  | 7,283 | 12,088 | 11,742 | 10,506 |  | 7,391 | 7,394 | 8,329
Commercial loans | Multi-family | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  |  |  |  |  |  |  |  | 10,404 |  |  |
Commercial loans | Commercial real estate |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  |  | 13,004 |  | 13,004 | 15,807 | 14,639 | 13,067 |  | 13,170 | 12,448 | 11,852
Commercial loans | Commercial real estate | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  |  |  |  |  |  |  |  | 13,024 |  |  |
Commercial loans | Commercial & industrial |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  |  | 31,071 |  | 31,071 | 42,179 | 38,576 | 33,676 |  | 31,450 | 30,574 | 28,702
Commercial loans | Commercial & industrial | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  |  |  |  |  |  |  |  | 32,235 |  |  |
Commercial loans | Construction |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  |  | 34,057 |  | 34,057 | 25,693 | 23,348 | 21,919 |  | 32,304 | 33,396 | 31,317
Commercial loans | Construction | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  |  |  |  |  |  |  |  | 22,768 |  |  |
Commercial loans | Land - acquisition & development |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  |  | 9,388 |  | 9,388 | 10,641 | 10,399 | 10,413 |  | 9,155 | 9,734 | 7,978
Commercial loans | Land - acquisition & development | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  |  |  |  |  |  |  |  | 10,904 |  |  |
Consumer loans |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  |  | 39,219 |  | 39,219 | 58,941 | 58,397 | 57,932 |  | 38,064 | 39,540 | 41,079
Consumer loans | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  |  |  |  |  |  |  |  | 59,949 |  |  |
Consumer loans | Construction |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  |  | 1,884 |  | 1,884 | 3,336 | 3,175 | 2,930 |  | 1,369 | 1,976 | 1,842
Consumer loans | Construction | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  |  |  |  |  |  |  |  | 2,880 |  |  |
Consumer loans | Single-family residential |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  |  | 31,514 |  | 31,514 | 47,149 | 46,817 | 46,356 |  | 30,988 | 31,476 | 33,033
Consumer loans | Single-family residential | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  |  |  |  |  |  |  |  | 47,771 |  |  |
Consumer loans | Land - consumer lot loans |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  |  | 2,032 |  | 2,032 | 2,671 | 2,578 | 2,567 |  | 2,143 | 2,076 | 2,164
Consumer loans | Land - consumer lot loans | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  |  |  |  |  |  |  |  | 2,635 |  |  |
Consumer loans | HELOC |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  |  | 1,087 |  | 1,087 | 2,588 | 2,246 | 2,034 |  | 1,103 | 1,082 | 781
Consumer loans | HELOC | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  |  |  |  |  |  |  |  | 2,048 |  |  |
Consumer loans | Consumer |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  |  | $ 2,702 |  | $ 2,702 | $ 3,197 | $ 3,581 | $ 4,045 |  | $ 2,461 | $ 2,930 | $ 3,259
Consumer loans | Consumer | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  |  |  |  |  |  |  |  | $ 4,615 |  |  |

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