Loans and Allowance for Loan Losses - Purchased Credit Impaired Loans (Details) - USD ($) $ in Millions	Jun. 30, 2020	Jun. 30, 2019
Pass
Purchased credit impaired loans	$ 5.9	$ 6.9
Watch
Purchased credit impaired loans	10.3	10.4
Special Mention
Purchased credit impaired loans	0.0	0.0
Substandard
Purchased credit impaired loans	5.6	11.2
Doubtful
Purchased credit impaired loans	$ 0.0	$ 0.0