Fair Value Measurements (Impaired Loans Remeasured and Reported at Fair Value of Underlying Collateral) (Detail) - USD ($) $ in Thousands |
Dec. 31, 2022 |
Dec. 31, 2021 |
Dec. 31, 2020 |
|---|---|---|---|
| Level 2 [Member] | |||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |||
| Carrying value before allocations | $ 6,237 | $ 1,333 | $ 1,559 |
| Specific valuation allowance allocations | (1,480) | (450) | |
| Reversal of specific valuation allowance allocations | 214 | ||
| Fair value | 4,757 | 1,547 | 1,109 |
| Level 3 [Member] | |||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |||
| Carrying value before allocations | 8,156 | 16,074 | 34,302 |
| Specific valuation allowance allocations | (5,178) | (11,151) | |
| Reversal of specific valuation allowance allocations | 625 | ||
| Fair value | $ 8,781 | $ 10,896 | $ 23,151 |