Loans - Loans Outstanding by Portfolio Class (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 3,660,081		$ 3,867,383
Allowance for credit losses	(56,779)	$ (55,649)	(57,027)	$ (56,319)	$ (55,090)	$ (17,667)
Net loans	3,603,302		3,810,356
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	2,173,200		2,192,271
Allowance for credit losses	(43,121)	(41,766)	(42,210)	(39,795)	(39,147)	(11,996)
Commercial | Owner occupied real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	521,186		496,306
Commercial | Non–owner occupied real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,016,377		999,636
Commercial | Residential spec homes
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	10,142		10,070
Commercial | Development & spec land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	31,957		26,372
Commercial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	593,538		659,887
Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	773,449		1,019,912
Allowance for credit losses	(3,737)	(4,108)	(4,620)	(5,464)	(5,832)	(923)
Real estate | Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	580,364		598,700
Real estate | Residential construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	23,176		25,586
Real estate | Mortgage warehouse
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	169,909		395,626
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	713,432		655,200
Allowance for credit losses	(8,867)	$ (8,620)	(8,930)	$ (9,810)	$ (8,921)	$ (3,671)
Consumer | Direct installment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	67,176		38,046
Consumer | Indirect installment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	365,756		357,511
Consumer | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 280,500		$ 259,643