Goodwill and Other Intangible Assets - Carrying Amounts of Goodwill by Operating Segments (Details) $ in Thousands	3 Months Ended
Mar. 31, 2025 USD ($)
Goodwill [Roll Forward]
Balance at January 1, 2025	$ 988,898
Additions to goodwill and other adjustments	0
Balance at March 31, 2025	988,898
Community Banks
Goodwill [Roll Forward]
Balance at January 1, 2025	988,898
Additions to goodwill and other adjustments	0
Balance at March 31, 2025	$ 988,898

Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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+ Details