COVID-19 (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($) loan	Jun. 30, 2019 loan	Jun. 30, 2020 USD ($) loan	Jun. 30, 2019 loan
Unusual or Infrequent Item, or Both [Line Items]
Financing receivable, approved modifications, number of loans | loan	2	0	2	0
COVID-19
Unusual or Infrequent Item, or Both [Line Items]
Financing receivable, approved modifications, number of loans | loan			271
Financing receivable, approved modifications, percent	6.40%		6.40%
Financing receivable, modifications, returned to payment status, number of loans | loan	38		38
Financing receivable, modifications, returned to payment status, amount | $	$ 55.0		$ 55.0
Financing receivable, modifications, paid off, number of loans | loan	2		2
Financing receivable, modifications, paid off, amount | $	$ 2.2		$ 2.2
Loan loss provisions | $			10.1
Financing receivable, modifications, amount | $	$ 398.4		$ 398.4