Intangible Assets and Goodwill - Summary of Goodwill by Business Segment (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2022 USD ($)
Goodwill [Line Items]
Balance at beginning of period	$ 149,922
Acquisitions	26,641
Balance at beginning and end of period	176,563
Metropolitan Banks [Member]
Goodwill [Line Items]
Balance at beginning of period	13,767
Balance at beginning and end of period	13,767
Community Banks [Member]
Goodwill [Line Items]
Balance at beginning of period	61,212
Balance at beginning and end of period	61,212
Pegasus [Member]
Goodwill [Line Items]
Balance at beginning of period	68,855
Balance at beginning and end of period	68,855
Worthington [Member]
Goodwill [Line Items]
Balance at beginning of period	0
Acquisitions	26,641
Balance at beginning and end of period	26,641
Other Financial Services [Member]
Goodwill [Line Items]
Balance at beginning of period	5,464
Balance at beginning and end of period	5,464
Executive, Operations & Support [Member]
Goodwill [Line Items]
Balance at beginning of period	624
Balance at beginning and end of period	$ 624