Loans - Schedule of Portfolio Loans, Purchased Credit Impaired Loans and Purchased Unimpaired Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 5,772,052	$ 5,198,404
Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	298,835	325,113
Commercial real estate - owner-occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,076,650	1,000,000
Commercial real estate - non owner-occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,392,787
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	1,468,171	1,507,863
Commercial and financial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	757,232	778,252
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	201,927	208,205
Paycheck Protection Program
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	576,450
Portfolio Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	4,892,335	4,317,918
Portfolio Loans | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	270,715	281,335
Portfolio Loans | Commercial real estate - owner-occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	832,943
Portfolio Loans | Commercial real estate - non owner-occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,074,063
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	1,249,368	1,304,305
Portfolio Loans | Commercial and financial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	692,933	697,301
Portfolio Loans | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	195,863	200,166
Portfolio Loans | Paycheck Protection Program
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	576,450
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	828,388
Acquired Non-PCD Loans | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	25,691
Acquired Non-PCD Loans | Commercial real estate - owner-occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	216,598
Acquired Non-PCD Loans | Commercial real estate - non owner-occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	306,880
Acquired Non-PCD Loans | Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	210,247
Acquired Non-PCD Loans | Commercial and financial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	63,272
Acquired Non-PCD Loans | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	5,700
Acquired Non-PCD Loans | Paycheck Protection Program
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	0
PCD Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	51,329
PCD Loans | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	2,429
PCD Loans | Commercial real estate - owner-occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	27,109
PCD Loans | Commercial real estate - non owner-occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	11,844
PCD Loans | Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	8,556
PCD Loans | Commercial and financial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,027
PCD Loans | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	364
PCD Loans | Paycheck Protection Program
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 0