Acquisitions - Narrative (Details)				3 Months Ended	12 Months Ended
	Oct. 01, 2021 USD ($) shares	Jul. 06, 2021 USD ($) shares	Jul. 01, 2020 USD ($) bank_branch shares	Dec. 31, 2020 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Business Acquisition [Line Items]
Goodwill				$ 367,809,000	$ 452,007,000	$ 367,809,000	$ 327,425,000
Merger-related and other charges					13,970,000	7,018,000	6,907,000
FinTrust
Business Acquisition [Line Items]
Total consideration		$ 21,700,000
Common stock issued in acquisition		$ 4,400,000
Shares issued in acquisition (in shares) | shares		132,299
Cash consideration		$ 9,620,000
Payable due		4,400,000
Contingent consideration		3,300,000
Assets acquired		22,800,000
Liabilities assumed		1,100,000
Goodwill		14,200,000
Right-of-use assets recognized		822,000
Operating lease liabilities recognized		822,000
FinTrust | Merger-related costs
Business Acquisition [Line Items]
Merger-related and other charges					518,000
FinTrust | Customer relationship intangible
Business Acquisition [Line Items]
Intangible assets acquired		$ 7,530,000
Expected useful life of acquired intangible (in years)		15 years
Aquesta
Business Acquisition [Line Items]
Total consideration	$ 131,666,000
Common stock issued in acquisition	$ 89,646,000
Shares issued in acquisition (in shares) | shares	2,731,435
Cash consideration	$ 40,542,000
Assets acquired	755,948,000
Liabilities assumed	694,317,000
Goodwill	70,035,000
Intangible assets acquired	2,030,000
Goodwill expected to be tax deductible	$ 0
Aquesta | Merger-related costs
Business Acquisition [Line Items]
Merger-related and other charges					$ 9,000,000
Aquesta | Core deposit intangible
Business Acquisition [Line Items]
Expected useful life of acquired intangible (in years)	10 years
Three Shores
Business Acquisition [Line Items]
Total consideration			$ 187,697,000
Common stock issued in acquisition			$ 163,589,000
Shares issued in acquisition (in shares) | shares			8,130,633
Cash consideration			$ 24,108,000
Assets acquired			2,134,339,000
Liabilities assumed			1,987,026,000
Goodwill			40,384,000
Intangible assets acquired			3,360,000
Goodwill expected to be tax deductible			$ 0
Number of banking offices | bank_branch			14
Measurement period adjustment increase to cash and cash equivalents				1,090,000.00
Measurement period adjustment increase to accrued interest receivable				116,000
Goodwill adjustment increase (decrease)				$ (1,210,000)
Three Shores | Merger-related costs
Business Acquisition [Line Items]
Merger-related and other charges						$ 5,040,000.00
Three Shores | Core deposit intangible
Business Acquisition [Line Items]
Expected useful life of acquired intangible (in years)			10 years
FMBT | Merger-related costs
Business Acquisition [Line Items]
Merger-related and other charges							$ 2,020,000.00