Interest-Bearing Deposits - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Deposits [Abstract]
Interest-bearing demand deposit, money market	$ 1,200.0
Certificates of deposit in denominations of $100 thousand or more	51.7	$ 93.1
Interest expense related to certificates of deposit $100 thousand or greater	0.4	2.0	$ 3.3
Deposit Liabilities Reclassified as Loans Receivable	$ 0.6	$ 0.7