Loans - Past Due Financing Receivables (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Past Due [Line Items]
Current	$ 5,616,641	$ 5,689,158
Nonaccrual	35,328	36,110
Loans	5,661,492	5,735,349
Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	7,584	6,382
Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	1,218	3,636
Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	721	63
Construction and land development
Financing Receivable, Past Due [Line Items]
Nonaccrual	162	167
Loans	227,117	245,108
Commercial real estate - owner-occupied
Financing Receivable, Past Due [Line Items]
Nonaccrual	7,165	8,181
Loans	1,133,085	1,141,310
Commercial real estate - non owner-occupied
Financing Receivable, Past Due [Line Items]
Nonaccrual	7,871	8,084
Loans	1,438,365	1,395,854
Residential real estate
Financing Receivable, Past Due [Line Items]
Nonaccrual	13,613	12,492
Loans	1,246,549	1,342,628
Commercial and financial
Financing Receivable, Past Due [Line Items]
Nonaccrual	6,094	6,604
Loans	860,813	854,753
Consumer
Financing Receivable, Past Due [Line Items]
Nonaccrual	423	582
Loans	173,910	188,735
Paycheck Protection Program
Financing Receivable, Past Due [Line Items]
Loans	581,653	566,961
Portfolio Loans
Financing Receivable, Past Due [Line Items]
Current	4,729,216	4,685,456
Nonaccrual	18,180	18,270
Loans	4,756,219	4,711,737
Portfolio Loans | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	6,988	4,416
Portfolio Loans | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	1,114	3,532
Portfolio Loans | Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	721	63
Portfolio Loans | Construction and land development
Financing Receivable, Past Due [Line Items]
Current	206,473	216,262
Nonaccrual	154	158
Loans	206,627	216,420
Portfolio Loans | Construction and land development | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Portfolio Loans | Construction and land development | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Portfolio Loans | Construction and land development | Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Portfolio Loans | Commercial real estate - owner-occupied
Financing Receivable, Past Due [Line Items]
Current	865,373	851,222
Nonaccrual	2,242	2,471
Loans	868,347	854,769
Portfolio Loans | Commercial real estate - owner-occupied | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	732	1,076
Portfolio Loans | Commercial real estate - owner-occupied | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Portfolio Loans | Commercial real estate - owner-occupied | Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Portfolio Loans | Commercial real estate - non owner-occupied
Financing Receivable, Past Due [Line Items]
Current	1,114,278	1,041,306
Nonaccrual	2,084	2,153
Loans	1,116,362	1,043,459
Portfolio Loans | Commercial real estate - non owner-occupied | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Portfolio Loans | Commercial real estate - non owner-occupied | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Portfolio Loans | Commercial real estate - non owner-occupied | Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Portfolio Loans | Residential real estate
Financing Receivable, Past Due [Line Items]
Current	1,073,848	1,142,893
Nonaccrual	8,832	8,531
Loans	1,088,822	1,155,914
Portfolio Loans | Residential real estate | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	4,344	3,002
Portfolio Loans | Residential real estate | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	1,078	1,427
Portfolio Loans | Residential real estate | Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	720	61
Portfolio Loans | Commercial and financial
Financing Receivable, Past Due [Line Items]
Current	755,349	737,362
Nonaccrual	4,445	4,382
Loans	760,975	743,846
Portfolio Loans | Commercial and financial | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	1,144	135
Portfolio Loans | Commercial and financial | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	36	1,967
Portfolio Loans | Commercial and financial | Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	1	0
Portfolio Loans | Consumer
Financing Receivable, Past Due [Line Items]
Current	166,587	180,879
Nonaccrual	423	575
Loans	167,778	181,797
Portfolio Loans | Consumer | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	768	203
Portfolio Loans | Consumer | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	138
Portfolio Loans | Consumer | Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	2
Portfolio Loans | Paycheck Protection Program
Financing Receivable, Past Due [Line Items]
Current	547,308	515,532
Nonaccrual	0	0
Loans	547,308	515,532
Portfolio Loans | Paycheck Protection Program | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Portfolio Loans | Paycheck Protection Program | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Portfolio Loans | Paycheck Protection Program | Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Acquired Non-PCD Loans
Financing Receivable, Past Due [Line Items]
Current	804,634	915,799
Nonaccrual	7,360	7,690
Loans	812,694	925,434
Acquired Non-PCD Loans | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	596	1,841
Acquired Non-PCD Loans | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	104	104
Acquired Non-PCD Loans | Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Acquired Non-PCD Loans | Construction and land development
Financing Receivable, Past Due [Line Items]
Current	18,465	26,250
Nonaccrual	0	0
Loans	18,465	26,250
Acquired Non-PCD Loans | Construction and land development | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Acquired Non-PCD Loans | Construction and land development | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Acquired Non-PCD Loans | Construction and land development | Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Acquired Non-PCD Loans | Commercial real estate - owner-occupied
Financing Receivable, Past Due [Line Items]
Current	223,758	244,486
Nonaccrual	2,027	2,604
Loans	225,785	247,090
Acquired Non-PCD Loans | Commercial real estate - owner-occupied | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Acquired Non-PCD Loans | Commercial real estate - owner-occupied | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Acquired Non-PCD Loans | Commercial real estate - owner-occupied | Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Acquired Non-PCD Loans | Commercial real estate - non owner-occupied
Financing Receivable, Past Due [Line Items]
Current	293,148	322,264
Nonaccrual	980	1,009
Loans	294,128	323,273
Acquired Non-PCD Loans | Commercial real estate - non owner-occupied | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Acquired Non-PCD Loans | Commercial real estate - non owner-occupied | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Acquired Non-PCD Loans | Commercial real estate - non owner-occupied | Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Acquired Non-PCD Loans | Residential real estate
Financing Receivable, Past Due [Line Items]
Current	145,347	171,507
Nonaccrual	3,715	2,889
Loans	149,762	176,105
Acquired Non-PCD Loans | Residential real estate | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	596	1,605
Acquired Non-PCD Loans | Residential real estate | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	104	104
Acquired Non-PCD Loans | Residential real estate | Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Acquired Non-PCD Loans | Commercial and financial
Financing Receivable, Past Due [Line Items]
Current	83,671	93,223
Nonaccrual	638	1,188
Loans	84,309	94,627
Acquired Non-PCD Loans | Commercial and financial | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	216
Acquired Non-PCD Loans | Commercial and financial | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Acquired Non-PCD Loans | Commercial and financial | Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Acquired Non-PCD Loans | Consumer
Financing Receivable, Past Due [Line Items]
Current	5,900	6,640
Nonaccrual	0	0
Loans	5,900	6,660
Acquired Non-PCD Loans | Consumer | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	20
Acquired Non-PCD Loans | Consumer | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Acquired Non-PCD Loans | Consumer | Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Acquired Non-PCD Loans | Paycheck Protection Program
Financing Receivable, Past Due [Line Items]
Current	34,345	51,429
Nonaccrual	0	0
Loans	34,345	51,429
Acquired Non-PCD Loans | Paycheck Protection Program | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Acquired Non-PCD Loans | Paycheck Protection Program | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Acquired Non-PCD Loans | Paycheck Protection Program | Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
PCD Loans
Financing Receivable, Past Due [Line Items]
Current	82,791	87,903
Nonaccrual	9,788	10,150
Loans	92,579	98,178
PCD Loans | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	125
PCD Loans | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
PCD Loans | Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
PCD Loans | Construction and land development
Financing Receivable, Past Due [Line Items]
Current	2,017	2,429
Nonaccrual	8	9
Loans	2,025	2,438
PCD Loans | Construction and land development | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
PCD Loans | Construction and land development | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
PCD Loans | Construction and land development | Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
PCD Loans | Commercial real estate - owner-occupied
Financing Receivable, Past Due [Line Items]
Current	36,057	36,345
Nonaccrual	2,896	3,106
Loans	38,953	39,451
PCD Loans | Commercial real estate - owner-occupied | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
PCD Loans | Commercial real estate - owner-occupied | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
PCD Loans | Commercial real estate - owner-occupied | Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
PCD Loans | Commercial real estate - non owner-occupied
Financing Receivable, Past Due [Line Items]
Current	23,068	24,200
Nonaccrual	4,807	4,922
Loans	27,875	29,122
PCD Loans | Commercial real estate - non owner-occupied | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
PCD Loans | Commercial real estate - non owner-occupied | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
PCD Loans | Commercial real estate - non owner-occupied | Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
PCD Loans | Residential real estate
Financing Receivable, Past Due [Line Items]
Current	6,899	9,537
Nonaccrual	1,066	1,072
Loans	7,965	10,609
PCD Loans | Residential real estate | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
PCD Loans | Residential real estate | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
PCD Loans | Residential real estate | Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
PCD Loans | Commercial and financial
Financing Receivable, Past Due [Line Items]
Current	14,518	15,121
Nonaccrual	1,011	1,034
Loans	15,529	16,280
PCD Loans | Commercial and financial | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	125
PCD Loans | Commercial and financial | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
PCD Loans | Commercial and financial | Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
PCD Loans | Consumer
Financing Receivable, Past Due [Line Items]
Current	232	271
Nonaccrual	0	7
Loans	232	278
PCD Loans | Consumer | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
PCD Loans | Consumer | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
PCD Loans | Consumer | Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
PCD Loans | Paycheck Protection Program
Financing Receivable, Past Due [Line Items]
Loans	$ 0	$ 0