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Allowance for Loan Losses - Narrative (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Provision (release) for credit losses |  | $ 6,500,000 |  | $ 10,800,000 | $ 8,200,000 | $ (3,750,000) | $ (1,900,000) |  | $ 0 | $ 750,000 | $ (500,000) | $ 21,750,000 |  | $ (1,650,000) |  | $ (5,450,000)
Net (charge-offs) recoveries |  |  |  |  |  |  |  |  |  |  |  | 3,271,000 |  | 3,577,000 |  |
Allowance for loan losses |  | 166,955,000 | [1] |  |  |  | 131,534,000 | [1] |  |  |  | 166,955,000 | [1] | 131,534,000 | [1] | 129,257,000
SBA PPP loans | [1] | 12,792,317,000 |  |  |  |  | 11,930,575,000 |  |  |  |  | 12,792,317,000 |  | 11,930,575,000 |  |
Financing receivable, gross |  | 12,959,272,000 |  |  |  |  | 13,312,388,000 |  |  |  |  | 12,959,272,000 |  | 13,312,388,000 |  |
Loans Subject to Quantitative Evaluation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for loan losses |  | 115,457,000 |  |  |  |  |  |  |  |  |  | 115,457,000 |  |  |  |
Loans Subject to Management Qualitative Evaluation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for loan losses |  | 51,498,000 |  |  |  |  |  |  |  |  |  | 51,498,000 |  |  |  |
Non-Performing Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing receivable, gross |  | $ 37,695,000 |  |  |  |  | $ 43,826,000 |  |  |  |  | $ 37,695,000 |  | $ 43,826,000 |  |
Ratio of non-performing assets to total assets |  | 0.20% |  |  |  |  | 0.27% |  |  |  |  | 0.20% |  | 0.27% |  |
Financial Asset Originated |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-accrual loans |  | $ 29,056,000 |  |  |  |  | $ 33,731,000 |  |  |  |  | $ 29,056,000 |  | $ 33,731,000 |  |
Commercial loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for loan losses |  | 109,923,000 |  |  |  |  | 93,470,000 |  |  |  |  | 109,923,000 |  | 93,470,000 |  | 88,178,000
Financing receivable, gross |  | 7,044,426,000 |  |  |  |  | 6,564,698,000 |  |  |  |  | 7,044,426,000 |  | 6,564,698,000 |  |
Commercial loans | Financial Asset Originated |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-accrual loans |  | 5,769,000 |  |  |  |  | 7,296,000 |  |  |  |  | 5,769,000 |  | 7,296,000 |  |
Commercial loans | Commercial & industrial |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for loan losses |  | 38,665,000 |  |  |  |  | 31,450,000 |  |  |  |  | 38,665,000 |  | 31,450,000 |  | $ 28,702,000
Financing receivable, gross |  | 2,115,513,000 |  |  |  |  | 1,268,695,000 |  |  |  |  | 2,115,513,000 |  | 1,268,695,000 |  |
Commercial loans | Commercial & industrial | Financial Asset Originated |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-accrual loans |  | 329,000 |  |  |  |  | $ 1,292,000 |  |  |  |  | 329,000 |  | $ 1,292,000 |  |
Commercial loans | Commercial & industrial | SBA Payroll Protection Program, CARES Act |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for loan losses |  | 0 |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
SBA PPP loans |  | $ 745,081,000 |  |  |  |  |  |  |  |  |  | $ 745,081,000 |  |  |  |
[1] | Effective October 1, 2019, the Company has applied FASB ASU 2016-13, Financial Instruments - Credit Losses ("ASC 326"), which requires the use of the current expected credit loss methodology ("CECL"). Prior to October 1, 2019, the calculation was based on incurred loss methodology. See Note E "Allowance for Loan Losses" for details.

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- Definition Amount, after allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919230-210447 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522 + Details
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