Goodwill and Other Acquisition-Related Intangible Assets (Narrative) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Indefinite-lived Intangible Assets [Line Items]
Goodwill recorded on acquisition			$ 2,622
Amortization of other acquisition-related intangible assets	$ 1,499	$ 1,579	2,734	$ 3,188
Wealth management
Indefinite-lived Intangible Assets [Line Items]
Goodwill recorded on acquisition			$ 2,622
Wealth management | Customer list and other intangibles
Indefinite-lived Intangible Assets [Line Items]
Amortization period in years, other intangible assets	10 years		10 years
Specialty finance
Indefinite-lived Intangible Assets [Line Items]
Goodwill recorded on acquisition			$ 0
Goodwill increase for foreign currency translation adjustments			$ 528
Specialty finance | Customer list intangibles
Indefinite-lived Intangible Assets [Line Items]
Amortization period in years, other intangible assets	18 years		18 years
Community banking
Indefinite-lived Intangible Assets [Line Items]
Goodwill recorded on acquisition			$ 0
Community banking | Core deposit intangibles
Indefinite-lived Intangible Assets [Line Items]
Amortization period in years, other intangible assets	10 years		10 years