Loans - Schedule of Portfolio Loans, Purchased Credit Impaired Loans and Purchased Unimpaired Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 5,905,884	$ 5,735,349
Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	227,459	245,108
Commercial real estate - owner-occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,201,336	1,141,310
Commercial real estate - non owner-occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,673,587	1,395,854
Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,467,329	1,342,628
Commercial and financial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	982,552	854,753
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	163,019	188,735
Paycheck Protection Program
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	190,602	566,961
Acquired Non-PCD Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,004,128	925,434
Acquired Non-PCD Loans | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	37,067	26,250
Acquired Non-PCD Loans | Commercial real estate - owner-occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	218,128	247,090
Acquired Non-PCD Loans | Commercial real estate - non owner-occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	428,095	323,273
Acquired Non-PCD Loans | Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	181,344	176,105
Acquired Non-PCD Loans | Commercial and financial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	97,642	94,627
Acquired Non-PCD Loans | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	5,092	6,660
Acquired Non-PCD Loans | Paycheck Protection Program
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	36,760	51,429
PCD Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	139,113	98,178
PCD Loans | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	48	2,438
PCD Loans | Commercial real estate - owner-occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	32,089	39,451
PCD Loans | Commercial real estate - non owner-occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	79,272	29,122
PCD Loans | Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	7,847	10,609
PCD Loans | Commercial and financial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	19,846	16,280
PCD Loans | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	11	278
PCD Loans | Paycheck Protection Program
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	0	0
Portfolio Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	4,762,643	4,711,737
Portfolio Loans | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	190,344	216,420
Portfolio Loans | Commercial real estate - owner-occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	951,119	854,769
Portfolio Loans | Commercial real estate - non owner-occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,166,220	1,043,459
Portfolio Loans | Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,278,138	1,155,914
Portfolio Loans | Commercial and financial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	865,064	743,846
Portfolio Loans | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	157,916	181,797
Portfolio Loans | Paycheck Protection Program
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 153,842	$ 515,532