Goodwill and Other Acquisition-Related Intangible Assets - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Indefinite-lived Intangible Assets [Line Items]
Amortization of other acquisition-related intangible assets	$ 4,042	$ 1,408	$ 6,322	$ 4,142
Community banking
Indefinite-lived Intangible Assets [Line Items]
Increase (decrease) goodwill, foreign currency translation	144,600
Community banking | Macatawa Bank Corporation | Trademark
Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived intangible assets acquired	$ 8,000
Community banking | Core deposit intangibles
Indefinite-lived Intangible Assets [Line Items]
Amortization period in years, other intangible assets	10 years		10 years
Community banking | Core deposit intangibles | Macatawa Bank Corporation
Indefinite-lived Intangible Assets [Line Items]
Finite-lived assets acquired	$ 99,300
Specialty finance
Indefinite-lived Intangible Assets [Line Items]
Increase (decrease) goodwill, foreign currency translation			$ (478)
Specialty finance | Customer list intangibles
Indefinite-lived Intangible Assets [Line Items]
Amortization period in years, other intangible assets	18 years		18 years
Wealth management | Customer list and other intangibles
Indefinite-lived Intangible Assets [Line Items]
Amortization period in years, other intangible assets	10 years		10 years