Goodwill and Other Intangible Assets (Schedule of Other Intangible Assets) (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Assets	$ 11,685	$ 12,186
Accumulated Amortization	(10,819)	(10,623)
Net Intangible Assets	866	1,563
Core Deposits [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Assets	9,300	9,300
Accumulated Amortization	(8,582)	(8,004)
Net Intangible Assets	718	1,296
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Assets	2,385	2,886
Accumulated Amortization	(2,237)	(2,619)
Net Intangible Assets	$ 148	$ 267