Loans - Non-Performing Assets (Detail) - USD ($)	Sep. 30, 2020	Dec. 31, 2019
Receivables [Abstract]
Total nonaccrual loans	$ 64,333,000	$ 63,761,000
Loans receivable 90 days or more past due and still accruing	0	0
Total Nonperforming Loans	64,333,000	63,761,000
Other real estate owned ("OREO")	1,052,000	63,000
Total nonperforming assets	$ 65,385,000	$ 63,824,000