Business Impact Of Covid-19 - Summary of Loans Funded under PPPLF (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2021 USD ($) Loans
Number of Loans | Loans	806
Long-term Debt, Gross	$ 353.4
PPP Loans [Member]
Long-term Debt, Gross	$ 236.2
Number of Loans as a Percentage of Loans	100.00%
Principal Balance as a Percentage of Loans	100.00%
Gross Loans [Member]
Number of Loans as a Percentage of Loans	37.00%
Principal Balance as a Percentage of Loans	24.00%
Dental services [Member]
Number of Loans | Loans	371
Long-term Debt, Gross	$ 62.6
Dental services [Member] | PPP Loans [Member]
Number of Loans as a Percentage of Loans	46.00%
Principal Balance as a Percentage of Loans	18.00%
Dental services [Member] | Gross Loans [Member]
Number of Loans as a Percentage of Loans	17.00%
Principal Balance as a Percentage of Loans	4.00%
Contractors [Member]
Number of Loans | Loans	110
Long-term Debt, Gross	$ 130.6
Contractors [Member] | PPP Loans [Member]
Number of Loans as a Percentage of Loans	14.00%
Principal Balance as a Percentage of Loans	37.00%
Contractors [Member] | Gross Loans [Member]
Number of Loans as a Percentage of Loans	5.00%
Principal Balance as a Percentage of Loans	9.00%
Other [Member]
Number of Loans | Loans	325
Long-term Debt, Gross	$ 160.2
Other [Member] | PPP Loans [Member]
Number of Loans as a Percentage of Loans	40.00%
Principal Balance as a Percentage of Loans	45.00%
Other [Member] | Gross Loans [Member]
Number of Loans as a Percentage of Loans	15.00%
Principal Balance as a Percentage of Loans	11.00%