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Loans (Details) $ in Thousands | 6 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2020 USD ($) contract | Mar. 31, 2021 USD ($) | Jan. 01, 2020 USD ($) | Dec. 31, 2019 USD ($)
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Gross loans | $ 3,665,596 |  | $ 3,618,825 | $ 3,616,099
Commercial and industrial |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Gross loans | 369,122 |  |  | $ 308,015
Small Business Administration Paycheck Protection Program | Commercial and industrial |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Gross loans | $ 90,000 |  |  |
Financing Receivable, Number of Contracts | contract | 1,500 |  |  |
Small Business Administration Paycheck Protection Program | Commercial and industrial | Forecast [Member] |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |
Interest and Fee Income, Other Loans |  | $ 3,000 |  |

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