Loans - Schedule of Portfolio Loans, Purchased Credit Impaired Loans and Purchased Unimpaired Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 5,317,208	$ 5,198,404
Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	295,405	325,113
Commercial real estate - owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,082,893
Commercial real estate - non owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,381,096
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		2,378,971
Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,559,754	1,507,863
Commercial and financial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	796,038	778,252
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	202,022	208,205
Portfolio Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	4,373,378	4,317,918
Portfolio Loans | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	257,481	281,335
Portfolio Loans | Commercial real estate - owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	824,836
Portfolio Loans | Commercial real estate - non owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,058,841
Portfolio Loans | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		1,834,811
Portfolio Loans | Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,315,664	1,304,305
Portfolio Loans | Commercial and financial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	721,380	697,301
Portfolio Loans | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	195,176	200,166
PULs
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		867,820
PULs | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		43,618
PULs | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		533,943
PULs | Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		201,848
PULs | Commercial and financial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		80,372
PULs | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		8,039
PCD Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		12,666
PCD Loans | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		160
PCD Loans | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		10,217
PCD Loans | Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		1,710
PCD Loans | Commercial and financial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		579
PCD Loans | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		$ 0
Acquired Non PCD Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	888,649
Acquired Non PCD Loans | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	34,934
Acquired Non PCD Loans | Commercial real estate - owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	230,517
Acquired Non PCD Loans | Commercial real estate - non owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	310,417
Acquired Non PCD Loans | Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	233,169
Acquired Non PCD Loans | Commercial and financial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	73,134
Acquired Non PCD Loans | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	6,478
PCD Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	55,181
PCD Loans | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	2,990
PCD Loans | Commercial real estate - owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	27,540
PCD Loans | Commercial real estate - non owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	11,838
PCD Loans | Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	10,921
PCD Loans | Commercial and financial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,524
PCD Loans | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 368