Fair Value Measurements (Impaired Loans Remeasured and Reported at Fair Value of Underlying Collateral) (Detail) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying value before allocations	$ 19,719	$ 6,237	$ 1,333
Specific valuation allowance allocations	(3,391)	(1,480)
Reversal of specific valuation allowance allocations			214
Fair value	16,328	4,757	1,547
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying value before allocations	15,465	8,156	16,074
Specific valuation allowance allocations	(2,344)		(5,178)
Reversal of specific valuation allowance allocations		625
Fair value	$ 13,121	$ 8,781	$ 10,896