Loans And Allowance For Credit Losses - Non-Accrual Loans, Loans Still Accruing and Past Due 90 Days or More and Restructured Loans (Detail) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Receivables [Abstract]
Nonaccrual loans	$ 31,652,000	$ 42,619,000
Total 90 Days Past Due Still Accruing	8,000	113,000
Troubled debt restructured loans*	21,000	24,000
Total	$ 31,681,000	$ 42,756,000