Business Impact Of Covid-19 - Summary of Loans Funded under PPPLF (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2021 USD ($) Loans
Number of Loans | Loans	333
Long-term Debt, Gross	$ 97.4
PPP Loans [Member]
Long-term Debt, Gross	$ 6.5
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	20.00%
Principal Balance as a Percentage of Loans	7.00%
Dental services [Member]
Number of Loans | Loans	174
Long-term Debt, Gross	$ 19.3
Dental services [Member] | PPP Loans [Member]
Number of Loans as a Percentage of Loans	52.00%
Principal Balance as a Percentage of Loans	20.00%
Dental services [Member] | Gross Loans [Member]
Number of Loans as a Percentage of Loans	10.00%
Principal Balance as a Percentage of Loans	1.00%
Contractors [Member]
Number of Loans | Loans	33
Long-term Debt, Gross	$ 20.4
Contractors [Member] | PPP Loans [Member]
Number of Loans as a Percentage of Loans	10.00%
Principal Balance as a Percentage of Loans	21.00%
Contractors [Member] | Gross Loans [Member]
Number of Loans as a Percentage of Loans	2.00%
Principal Balance as a Percentage of Loans	2.00%
Other [Member]
Number of Loans | Loans	126
Long-term Debt, Gross	$ 57.7
Other [Member] | PPP Loans [Member]
Number of Loans as a Percentage of Loans	38.00%
Principal Balance as a Percentage of Loans	59.00%
Other [Member] | Gross Loans [Member]
Number of Loans as a Percentage of Loans	8.00%
Principal Balance as a Percentage of Loans	4.00%