Loans - Schedule of Portfolio Loans, Purchased Credit Impaired Loans and Purchased Unimpaired Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 5,858,029	$ 5,198,404
Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	280,610	325,113
Commercial real estate - owner-occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,125,460	1,000,000
Commercial real estate - non owner-occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,394,464
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	1,393,396	1,507,863
Commercial and financial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	833,083	778,252
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	192,216	208,205
Paycheck Protection Program
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	638,800
Portfolio Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	4,741,953	4,317,918
Portfolio Loans | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	246,312	281,335
Portfolio Loans | Commercial real estate - owner-occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	817,547
Portfolio Loans | Commercial real estate - non owner-occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,014,993
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	1,182,558	1,304,305
Portfolio Loans | Commercial and financial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	711,358	697,301
Portfolio Loans | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	184,608	200,166
Portfolio Loans | Paycheck Protection Program
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	584,577
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	1,014,105
Acquired Non-PCD Loans | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	30,720
Acquired Non-PCD Loans | Commercial real estate - owner-occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	267,223
Acquired Non-PCD Loans | Commercial real estate - non owner-occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	348,085
Acquired Non-PCD Loans | Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	201,221
Acquired Non-PCD Loans | Commercial and financial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	105,327
Acquired Non-PCD Loans | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	7,306
Acquired Non-PCD Loans | Paycheck Protection Program
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	54,223
PCD Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	101,971
PCD Loans | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	3,578
PCD Loans | Commercial real estate - owner-occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	40,690
PCD Loans | Commercial real estate - non owner-occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	31,386
PCD Loans | Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	9,617
PCD Loans | Commercial and financial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	16,398
PCD Loans | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	302
PCD Loans | Paycheck Protection Program
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 0