Loans - Risk Categories of Loans by Class of Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]
2020	$ 1,309,434
2019	912,701
2018	779,840
2017	589,022
2016	582,417
Prior	928,105
Revolving	633,830
Total	5,735,349	$ 5,198,404
Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2020	1,302,389
2019	898,213
2018	741,734
2017	562,336
2016	553,531
Prior	885,576
Revolving	628,070
Total	5,571,849	5,091,691
Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2020	6,108
2019	3,507
2018	19,722
2017	13,953
2016	14,820
Prior	7,235
Revolving	2,544
Total	67,889	51,560
Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2020	504
2019	41
2018	12,725
2017	7,256
2016	10,823
Prior	14,083
Revolving	1,092
Total	46,524	53,958
Substandard Impaired
Financing Receivable, Credit Quality Indicator [Line Items]
2020	433
2019	10,940
2018	5,659
2017	5,477
2016	3,243
Prior	21,211
Revolving	2,104
Total	49,067
Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving	20
Total	20	1,195
Construction and land development
Financing Receivable, Credit Quality Indicator [Line Items]
2020	62,313
2019	52,629
2018	51,985
2017	15,910
2016	7,335
Prior	19,612
Revolving	35,324
Total	245,108	325,113
Construction and land development | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2020	62,107
2019	52,384
2018	46,067
2017	15,873
2016	7,335
Prior	17,873
Revolving	35,324
Total	236,963	317,765
Construction and land development | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2020	206
2019	245
2018	5,918
2017	0
2016	0
Prior	1,449
Revolving	0
Total	7,818	2,235
Construction and land development | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	51
Revolving	0
Total	51	5,113
Construction and land development | Substandard Impaired
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	37
2016	0
Prior	239
Revolving	0
Total	276
Construction and land development | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving	0
Total	0	0
Commercial real estate - owner occupied
Financing Receivable, Credit Quality Indicator [Line Items]
2020	161,726
2019	203,568
2018	160,328
2017	144,412
2016	154,815
Prior	302,204
Revolving	14,257
Total	1,141,310	1,000,000
Commercial real estate - owner occupied | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2020	155,953
2019	198,559
2018	156,276
2017	138,341
2016	148,389
Prior	287,772
Revolving	14,255
Total	1,099,545
Commercial real estate - owner occupied | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2020	5,773
2019	1,858
2018	3,305
2017	0
2016	4,471
Prior	4,050
Revolving	2
Total	19,459
Commercial real estate - owner occupied | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019
2018	0
2017	4,709
2016	1,955
Prior	5,508
Revolving	0
Total	12,172
Commercial real estate - owner occupied | Substandard Impaired
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	3,151
2018	747
2017	1,362
2016	0
Prior	4,874
Revolving	0
Total	10,134
Commercial real estate - owner occupied | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving	0
Total	0
Commercial real estate - non-owner occupied
Financing Receivable, Credit Quality Indicator [Line Items]
2020	159,299
2019	316,136
2018	220,308
2017	130,937
2016	194,299
Prior	366,279
Revolving	8,596
Total	1,395,854
Commercial real estate - non-owner occupied | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2020	159,299
2019	313,287
2018	201,112
2017	123,357
2016	175,623
Prior	356,943
Revolving	8,596
Total	1,338,217
Commercial real estate - non-owner occupied | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	431
2018	9,487
2017	7,580
2016	10,240
Prior	114
Revolving	0
Total	27,852
Commercial real estate - non-owner occupied | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	9,709
2017	0
2016	8,311
Prior	3,682
Revolving	0
Total	21,702
Commercial real estate - non-owner occupied | Substandard Impaired
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	2,418
2018	0
2017	0
2016	125
Prior	5,540
Revolving	0
Total	8,083
Commercial real estate - non-owner occupied | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving	0
Total	0
Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total		2,378,971
Commercial real estate | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total		2,331,725
Commercial real estate | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total		26,827
Commercial real estate | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total		20,098
Commercial real estate | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total		321
Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2020	97,278
2019	145,055
2018	205,630
2017	208,424
2016	161,327
Prior	171,831
Revolving	353,083
Total	1,342,628	1,507,863
Residential real estate | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2020	96,819
2019	144,329
2018	204,077
2017	205,046
2016	160,612
Prior	159,742
Revolving	350,502
Total	1,321,127	1,482,278
Residential real estate | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	33
2017	720
2016	0
Prior	966
Revolving	479
Total	2,198	7,364
Residential real estate | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2020	350
2019	0
2018	0
2017	896
2016	0
Prior	1,452
Revolving	100
Total	2,798	18,221
Residential real estate | Substandard Impaired
Financing Receivable, Credit Quality Indicator [Line Items]
2020	109
2019	726
2018	1,520
2017	1,762
2016	715
Prior	9,671
Revolving	2,002
Total	16,505
Residential real estate | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving	0
Total	0	0
Commercial and financial
Financing Receivable, Credit Quality Indicator [Line Items]
2020	215,316
2019	152,093
2018	110,949
2017	70,295
2016	42,386
Prior	58,336
Revolving	205,378
Total	854,753	778,252
Commercial and financial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2020	214,774
2019	146,511
2018	103,769
2017	60,782
2016	39,692
Prior	53,758
Revolving	204,304
Total	823,590	755,957
Commercial and financial | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2020	71
2019	946
2018	965
2017	5,612
2016	67
Prior	635
Revolving	209
Total	8,505	11,925
Commercial and financial | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2020	154
2019	41
2018	3,016
2017	1,609
2016	553
Prior	3,239
Revolving	764
Total	9,376	9,496
Commercial and financial | Substandard Impaired
Financing Receivable, Credit Quality Indicator [Line Items]
2020	317
2019	4,595
2018	3,199
2017	2,292
2016	2,074
Prior	704
Revolving	81
Total	13,262
Commercial and financial | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving	20
Total	20	874
Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2020	46,541
2019	43,220
2018	30,640
2017	19,044
2016	22,255
Prior	9,843
Revolving	17,192
Total	188,735	208,205
Consumer | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2020	46,476
2019	43,143
2018	30,433
2017	18,937
2016	21,880
Prior	9,488
Revolving	15,089
Total	185,446	203,966
Consumer | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2020	58
2019	27
2018	14
2017	41
2016	42
Prior	21
Revolving	1,854
Total	2,057	3,209
Consumer | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	42
2016	4
Prior	151
Revolving	228
Total	425	1,030
Consumer | Substandard Impaired
Financing Receivable, Credit Quality Indicator [Line Items]
2020	7
2019	50
2018	193
2017	24
2016	329
Prior	183
Revolving	21
Total	807
Consumer | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving	0
Total	0	$ 0
Paycheck Protection Program
Financing Receivable, Credit Quality Indicator [Line Items]
2020	566,961
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving	0
Total	566,961
Paycheck Protection Program | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2020	566,961
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving	0
Total	$ 566,961