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