Loans - Past Due Financing Receivables (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Financing Receivable, Past Due [Line Items]
Current	$ 5,266,609	$ 5,163,098
Nonaccrual	25,582	26,955
Loans	5,317,208	5,198,404
Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	21,408	7,259
Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	2,990	984
Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	619	108
Construction and land development
Financing Receivable, Past Due [Line Items]
Nonaccrual	606	4,937
Loans	295,405	325,113
Commercial real estate
Financing Receivable, Past Due [Line Items]
Nonaccrual		6,520
Loans		2,378,971
Commercial real estate - owner occupied
Financing Receivable, Past Due [Line Items]
Nonaccrual	2,864
Loans	1,082,893
Commercial real estate - non owner occupied
Financing Receivable, Past Due [Line Items]
Nonaccrual	4,275
Loans	1,381,096
Residential real estate
Financing Receivable, Past Due [Line Items]
Nonaccrual	8,844	9,480
Loans	1,559,754	1,507,863
Commercial and financial
Financing Receivable, Past Due [Line Items]
Nonaccrual	8,416	5,908
Loans	796,038	778,252
Consumer
Financing Receivable, Past Due [Line Items]
Nonaccrual	577	110
Loans	202,022	208,205
Portfolio Loans
Financing Receivable, Past Due [Line Items]
Current	4,340,454	4,290,227
Nonaccrual	17,898	20,990
Loans	4,373,378	4,317,918
Portfolio Loans \| Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	11,534	6,040
Portfolio Loans \| Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	2,873	553
Portfolio Loans \| Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	619	108
Portfolio Loans \| Construction and land development
Financing Receivable, Past Due [Line Items]
Current	257,459	276,984
Nonaccrual	22	4,351
Loans	257,481	281,335
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
Financing Receivable, Past Due [Line Items]
Current		1,828,629
Nonaccrual		4,356
Loans		1,834,811
Portfolio Loans \| Commercial real estate \| Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due		1,606
Portfolio Loans \| Commercial real estate \| Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due		220
Portfolio Loans \| Commercial real estate \| Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due		0
Portfolio Loans \| Commercial real estate - owner occupied
Financing Receivable, Past Due [Line Items]
Current	818,726
Nonaccrual	2,650
Loans	824,836
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	2,842
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
Portfolio Loans \| Commercial real estate - owner occupied \| Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	618
Portfolio Loans \| Commercial real estate - non owner occupied
Financing Receivable, Past Due [Line Items]
Current	1,056,202
Nonaccrual	2,097
Loans	1,058,841
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	542
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
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
Portfolio Loans \| Residential real estate
Financing Receivable, Past Due [Line Items]
Current	1,305,898	1,294,778
Nonaccrual	6,363	7,945
Loans	1,315,664	1,304,305
Portfolio Loans \| Residential real estate \| Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	2,405	1,564
Portfolio Loans \| Residential real estate \| Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	998	18
Portfolio Loans \| Residential real estate \| Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Portfolio Loans \| Commercial and financial
Financing Receivable, Past Due [Line Items]
Current	709,028	690,412
Nonaccrual	6,189	4,228
Loans	721,380	697,301
Portfolio Loans \| Commercial and financial \| Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	5,098	2,553
Portfolio Loans \| Commercial and financial \| Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	1,065	0
Portfolio Loans \| Commercial and financial \| Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	108
Portfolio Loans \| Consumer
Financing Receivable, Past Due [Line Items]
Current	193,141	199,424
Nonaccrual	577	110
Loans	195,176	200,166
Portfolio Loans \| Consumer \| Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	647	317
Portfolio Loans \| Consumer \| Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	810	315
Portfolio Loans \| Consumer \| Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	1	0
Acquired Non PCD Loans
Financing Receivable, Past Due [Line Items]
Current		862,272
Nonaccrual		3,898
Loans		867,820
Acquired Non PCD Loans \| Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due		1,219
Acquired Non PCD Loans \| Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due		431
Acquired Non PCD Loans \| Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due		0
Acquired Non PCD Loans \| Construction and land development
Financing Receivable, Past Due [Line Items]
Current		43,044
Nonaccrual		574
Loans		43,618
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
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
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
Acquired Non PCD Loans \| Commercial real estate
Financing Receivable, Past Due [Line Items]
Current		531,325
Nonaccrual		1,245
Loans		533,943
Acquired Non PCD Loans \| Commercial real estate \| Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due		942
Acquired Non PCD Loans \| Commercial real estate \| Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due		431
Acquired Non PCD Loans \| Commercial real estate \| Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due		0
Acquired Non PCD Loans \| Residential real estate
Financing Receivable, Past Due [Line Items]
Current		201,159
Nonaccrual		412
Loans		201,848
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		277
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		0
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
Acquired Non PCD Loans \| Commercial and financial
Financing Receivable, Past Due [Line Items]
Current		78,705
Nonaccrual		1,667
Loans		80,372
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
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
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
Acquired Non PCD Loans \| Consumer
Financing Receivable, Past Due [Line Items]
Current		8,039
Nonaccrual		0
Loans		8,039
Acquired Non PCD Loans \| Consumer \| Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due		0
Acquired Non PCD Loans \| Consumer \| Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due		0
Acquired Non PCD Loans \| Consumer \| Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due		0
PCD Loans
Financing Receivable, Past Due [Line Items]
Current		10,599
Nonaccrual		2,067
Loans		12,666
PCD Loans \| Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due		0
PCD Loans \| Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due		0
PCD Loans \| Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due		0
PCD Loans \| Construction and land development
Financing Receivable, Past Due [Line Items]
Current		148
Nonaccrual		12
Loans		160
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
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
PCD Loans \| Construction and land development \| Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due		0
PCD Loans \| Commercial real estate
Financing Receivable, Past Due [Line Items]
Current		9,298
Nonaccrual		919
Loans		10,217
PCD Loans \| Commercial real estate \| Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due		0
PCD Loans \| Commercial real estate \| Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due		0
PCD Loans \| Commercial real estate \| Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due		0
PCD Loans \| Residential real estate
Financing Receivable, Past Due [Line Items]
Current		587
Nonaccrual		1,123
Loans		1,710
PCD Loans \| Residential real estate \| Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due		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
PCD Loans \| Residential real estate \| Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due		0
PCD Loans \| Commercial and financial
Financing Receivable, Past Due [Line Items]
Current		566
Nonaccrual		13
Loans		579
PCD Loans \| Commercial and financial \| Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due		0
PCD Loans \| Commercial and financial \| Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due		0
PCD Loans \| Commercial and financial \| Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due		0
PCD Loans \| Consumer
Financing Receivable, Past Due [Line Items]
Current		0
Nonaccrual		0
Loans		0
PCD Loans \| Consumer \| Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due		0
PCD Loans \| Consumer \| Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due		0
PCD Loans \| Consumer \| Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due		$ 0
Acquired Non PCD Loans
Financing Receivable, Past Due [Line Items]
Current	875,222
Nonaccrual	5,331
Loans	888,649
Acquired Non PCD Loans \| Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	7,979
Acquired Non PCD Loans \| Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	117
Acquired Non PCD Loans \| Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0
Acquired Non PCD Loans \| Construction and land development
Financing Receivable, Past Due [Line Items]
Current	34,360
Nonaccrual	574
Loans	34,934
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
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
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
Acquired Non PCD Loans \| Commercial real estate - owner occupied
Financing Receivable, Past Due [Line Items]
Current	228,776
Nonaccrual	214
Loans	230,517
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	1,456
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	71
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
Acquired Non PCD Loans \| Commercial real estate - non owner occupied
Financing Receivable, Past Due [Line Items]
Current	306,959
Nonaccrual	1,124
Loans	310,417
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	2,334
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
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
Acquired Non PCD Loans \| Residential real estate
Financing Receivable, Past Due [Line Items]
Current	228,213
Nonaccrual	1,280
Loans	233,169
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	3,676
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	0
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
Acquired Non PCD Loans \| Commercial and financial
Financing Receivable, Past Due [Line Items]
Current	70,460
Nonaccrual	2,139
Loans	73,134
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	489
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	46
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
Acquired Non PCD Loans \| Consumer
Financing Receivable, Past Due [Line Items]
Current	6,454
Nonaccrual	0
Loans	6,478
Acquired Non PCD Loans \| Consumer \| Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	24
Acquired Non PCD Loans \| Consumer \| Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0
Acquired Non PCD Loans \| Consumer \| Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0
PCD Loans
Financing Receivable, Past Due [Line Items]
Current	50,933
Nonaccrual	2,353
Loans	55,181
PCD Loans \| Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	1,895
PCD Loans \| Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0
PCD Loans \| Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0
PCD Loans \| Construction and land development
Financing Receivable, Past Due [Line Items]
Current	2,980
Nonaccrual	10
Loans	2,990
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
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
PCD Loans \| Construction and land development \| Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0
PCD Loans \| Commercial real estate - owner occupied
Financing Receivable, Past Due [Line Items]
Current	26,462
Nonaccrual	0
Loans	27,540
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	1,078
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
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
PCD Loans \| Commercial real estate - non owner occupied
Financing Receivable, Past Due [Line Items]
Current	10,784
Nonaccrual	1,054
Loans	11,838
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
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
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
PCD Loans \| Residential real estate
Financing Receivable, Past Due [Line Items]
Current	9,720
Nonaccrual	1,201
Loans	10,921
PCD Loans \| Residential real estate \| Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	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
PCD Loans \| Residential real estate \| Accruing Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0
PCD Loans \| Commercial and financial
Financing Receivable, Past Due [Line Items]
Current	709
Nonaccrual	88
Loans	1,524
PCD Loans \| Commercial and financial \| Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	727
PCD Loans \| Commercial and financial \| Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0

Loans - Past Due Financing Receivables (Details) - USD ($)
$ in Thousands

Mar. 31, 2020

Dec. 31, 2019

Financing Receivable, Past Due [Line Items]

Current

$ 5,266,609

$ 5,163,098

Nonaccrual

25,582

26,955

Loans

5,317,208