Loans - Risk Categories of Loans by Class of Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	$ 1,275,835	$ 1,309,434
One year prior to current fiscal year	778,019	912,701
Two years prior to current fiscal year	803,819	779,840
Three years prior to current fiscal year	643,537	589,022
Four years prior to current fiscal year	468,530	582,417
Prior	1,299,928	928,105
Revolving	636,216	633,830
Total	5,905,884	5,735,349
Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	1,275,272	1,302,389
One year prior to current fiscal year	749,567	898,213
Two years prior to current fiscal year	777,329	741,734
Three years prior to current fiscal year	610,043	562,336
Four years prior to current fiscal year	450,798	553,531
Prior	1,241,138	885,576
Revolving	629,985	628,070
Total	5,734,132	5,571,849
Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	563	6,108
One year prior to current fiscal year	22,763	3,507
Two years prior to current fiscal year	8,088	19,722
Three years prior to current fiscal year	1,006	13,953
Four years prior to current fiscal year	2,157	14,820
Prior	14,491	7,235
Revolving	2,168	2,544
Total	51,236	67,889
Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	504
One year prior to current fiscal year	5,186	41
Two years prior to current fiscal year	8,358	12,725
Three years prior to current fiscal year	27,832	7,256
Four years prior to current fiscal year	7,336	10,823
Prior	25,709	14,083
Revolving	258	1,092
Total	74,679	46,524
Substandard Impaired
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	433
One year prior to current fiscal year	503	10,940
Two years prior to current fiscal year	10,044	5,659
Three years prior to current fiscal year	4,656	5,477
Four years prior to current fiscal year	8,239	3,243
Prior	18,590	21,211
Revolving	3,805	2,104
Total	45,837	49,067
Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
One year prior to current fiscal year	0	0
Two years prior to current fiscal year	0	0
Three years prior to current fiscal year	0	0
Four years prior to current fiscal year	0	0
Prior	0	0
Revolving	0	20
Total	0	20
Construction and land development
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	62,879	62,313
One year prior to current fiscal year	38,326	52,629
Two years prior to current fiscal year	38,517	51,985
Three years prior to current fiscal year	26,344	15,910
Four years prior to current fiscal year	4,771	7,335
Prior	21,032	19,612
Revolving	35,590	35,324
Total	227,459	245,108
Construction and land development | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	62,879	62,107
One year prior to current fiscal year	38,326	52,384
Two years prior to current fiscal year	38,517	46,067
Three years prior to current fiscal year	26,344	15,873
Four years prior to current fiscal year	4,771	7,335
Prior	20,952	17,873
Revolving	35,590	35,324
Total	227,379	236,963
Construction and land development | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	206
One year prior to current fiscal year	0	245
Two years prior to current fiscal year	0	5,918
Three years prior to current fiscal year	0	0
Four years prior to current fiscal year	0	0
Prior	0	1,449
Revolving	0	0
Total	0	7,818
Construction and land development | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
One year prior to current fiscal year	0	0
Two years prior to current fiscal year	0	0
Three years prior to current fiscal year	0	0
Four years prior to current fiscal year	0	0
Prior	0	51
Revolving	0	0
Total	0	51
Construction and land development | Substandard Impaired
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
One year prior to current fiscal year	0	0
Two years prior to current fiscal year	0	0
Three years prior to current fiscal year	0	37
Four years prior to current fiscal year	0	0
Prior	80	239
Revolving	0	0
Total	80	276
Construction and land development | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
One year prior to current fiscal year	0	0
Two years prior to current fiscal year	0	0
Three years prior to current fiscal year	0	0
Four years prior to current fiscal year	0	0
Prior	0	0
Revolving	0	0
Total	0	0
Commercial real estate - owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	155,499	161,726
One year prior to current fiscal year	166,340	203,568
Two years prior to current fiscal year	194,669	160,328
Three years prior to current fiscal year	143,015	144,412
Four years prior to current fiscal year	137,640	154,815
Prior	395,222	302,204
Revolving	8,951	14,257
Total	1,201,336	1,141,310
Commercial real estate - owner-occupied | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	155,499	155,953
One year prior to current fiscal year	159,752	198,559
Two years prior to current fiscal year	186,442	156,276
Three years prior to current fiscal year	142,027	138,341
Four years prior to current fiscal year	132,413	148,389
Prior	385,244	287,772
Revolving	8,951	14,255
Total	1,170,328	1,099,545
Commercial real estate - owner-occupied | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	5,773
One year prior to current fiscal year	6,588	1,858
Two years prior to current fiscal year	5,416	3,305
Three years prior to current fiscal year	655	0
Four years prior to current fiscal year	220	4,471
Prior	5,690	4,050
Revolving	0	2
Total	18,569	19,459
Commercial real estate - owner-occupied | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
One year prior to current fiscal year	0	0
Two years prior to current fiscal year	0	0
Three years prior to current fiscal year	77	4,709
Four years prior to current fiscal year	3,903	1,955
Prior	2,770	5,508
Revolving	0	0
Total	6,750	12,172
Commercial real estate - owner-occupied | Substandard Impaired
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
One year prior to current fiscal year	0	3,151
Two years prior to current fiscal year	2,811	747
Three years prior to current fiscal year	256	1,362
Four years prior to current fiscal year	1,104	0
Prior	1,518	4,874
Revolving	0	0
Total	5,689	10,134
Commercial real estate - owner-occupied | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
One year prior to current fiscal year	0	0
Two years prior to current fiscal year	0	0
Three years prior to current fiscal year	0	0
Four years prior to current fiscal year	0	0
Prior	0	0
Revolving	0	0
Total	0	0
Commercial real estate - non owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	248,842	159,299
One year prior to current fiscal year	206,738	316,136
Two years prior to current fiscal year	311,174	220,308
Three years prior to current fiscal year	226,478	130,937
Four years prior to current fiscal year	127,378	194,299
Prior	545,774	366,279
Revolving	7,203	8,596
Total	1,673,587	1,395,854
Commercial real estate - non owner-occupied | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	248,842	159,299
One year prior to current fiscal year	201,940	313,287
Two years prior to current fiscal year	303,903	201,112
Three years prior to current fiscal year	202,400	123,357
Four years prior to current fiscal year	123,851	175,623
Prior	513,792	356,943
Revolving	7,203	8,596
Total	1,601,931	1,338,217
Commercial real estate - non owner-occupied | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
One year prior to current fiscal year	0	431
Two years prior to current fiscal year	2,363	9,487
Three years prior to current fiscal year	0	7,580
Four years prior to current fiscal year	1,620	10,240
Prior	8,397	114
Revolving	0	0
Total	12,380	27,852
Commercial real estate - non owner-occupied | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
One year prior to current fiscal year	4,798	0
Two years prior to current fiscal year	3,856	9,709
Three years prior to current fiscal year	24,078	0
Four years prior to current fiscal year	1,907	8,311
Prior	19,446	3,682
Revolving	0	0
Total	54,085	21,702
Commercial real estate - non owner-occupied | Substandard Impaired
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
One year prior to current fiscal year	0	2,418
Two years prior to current fiscal year	1,052	0
Three years prior to current fiscal year	0	0
Four years prior to current fiscal year	0	125
Prior	4,139	5,540
Revolving	0	0
Total	5,191	8,083
Commercial real estate - non owner-occupied | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
One year prior to current fiscal year	0	0
Two years prior to current fiscal year	0	0
Three years prior to current fiscal year	0	0
Four years prior to current fiscal year	0	0
Prior	0	0
Revolving	0	0
Total	0	0
Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	364,563	97,278
One year prior to current fiscal year	119,527	145,055
Two years prior to current fiscal year	111,288	205,630
Three years prior to current fiscal year	136,131	208,424
Four years prior to current fiscal year	137,509	161,327
Prior	252,705	171,831
Revolving	345,606	353,083
Total	1,467,329	1,342,628
Residential real estate | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	364,563	96,819
One year prior to current fiscal year	119,039	144,329
Two years prior to current fiscal year	110,560	204,077
Three years prior to current fiscal year	136,044	205,046
Four years prior to current fiscal year	132,151	160,612
Prior	243,005	159,742
Revolving	342,581	350,502
Total	1,447,943	1,321,127
Residential real estate | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
One year prior to current fiscal year	0	0
Two years prior to current fiscal year	0	33
Three years prior to current fiscal year	47	720
Four years prior to current fiscal year	0	0
Prior	205	966
Revolving	285	479
Total	537	2,198
Residential real estate | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	350
One year prior to current fiscal year	0	0
Two years prior to current fiscal year	0	0
Three years prior to current fiscal year	0	896
Four years prior to current fiscal year	0	0
Prior	160	1,452
Revolving	35	100
Total	195	2,798
Residential real estate | Substandard Impaired
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	109
One year prior to current fiscal year	488	726
Two years prior to current fiscal year	728	1,520
Three years prior to current fiscal year	40	1,762
Four years prior to current fiscal year	5,358	715
Prior	9,335	9,671
Revolving	2,705	2,002
Total	18,654	16,505
Residential real estate | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
One year prior to current fiscal year	0	0
Two years prior to current fiscal year	0	0
Three years prior to current fiscal year	0	0
Four years prior to current fiscal year	0	0
Prior	0	0
Revolving	0	0
Total	0	0
Commercial and financial
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	229,731	215,316
One year prior to current fiscal year	203,588	152,093
Two years prior to current fiscal year	117,858	110,949
Three years prior to current fiscal year	91,515	70,295
Four years prior to current fiscal year	49,026	42,386
Prior	66,919	58,336
Revolving	223,915	205,378
Total	982,552	854,753
Commercial and financial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	229,168	214,774
One year prior to current fiscal year	187,063	146,511
Two years prior to current fiscal year	107,743	103,769
Three years prior to current fiscal year	83,267	60,782
Four years prior to current fiscal year	45,562	39,692
Prior	60,048	53,758
Revolving	222,822	204,304
Total	935,673	823,590
Commercial and financial | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	563	71
One year prior to current fiscal year	16,137	946
Two years prior to current fiscal year	219	965
Three years prior to current fiscal year	247	5,612
Four years prior to current fiscal year	275	67
Prior	149	635
Revolving	406	209
Total	17,996	8,505
Commercial and financial | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	154
One year prior to current fiscal year	388	41
Two years prior to current fiscal year	4,502	3,016
Three years prior to current fiscal year	3,666	1,609
Four years prior to current fiscal year	1,491	553
Prior	3,333	3,239
Revolving	25	764
Total	13,405	9,376
Commercial and financial | Substandard Impaired
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	317
One year prior to current fiscal year	0	4,595
Two years prior to current fiscal year	5,394	3,199
Three years prior to current fiscal year	4,335	2,292
Four years prior to current fiscal year	1,698	2,074
Prior	3,389	704
Revolving	662	81
Total	15,478	13,262
Commercial and financial | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
One year prior to current fiscal year	0	0
Two years prior to current fiscal year	0	0
Three years prior to current fiscal year	0	0
Four years prior to current fiscal year	0	0
Prior	0	0
Revolving	0	20
Total	0	20
Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	32,239	46,541
One year prior to current fiscal year	34,980	43,220
Two years prior to current fiscal year	30,313	30,640
Three years prior to current fiscal year	20,054	19,044
Four years prior to current fiscal year	12,206	22,255
Prior	18,276	9,843
Revolving	14,951	17,192
Total	163,019	188,735
Consumer | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	32,239	46,476
One year prior to current fiscal year	34,927	43,143
Two years prior to current fiscal year	30,164	30,433
Three years prior to current fiscal year	19,961	18,937
Four years prior to current fiscal year	12,050	21,880
Prior	18,097	9,488
Revolving	12,838	15,089
Total	160,276	185,446
Consumer | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	58
One year prior to current fiscal year	38	27
Two years prior to current fiscal year	90	14
Three years prior to current fiscal year	57	41
Four years prior to current fiscal year	42	42
Prior	50	21
Revolving	1,477	1,854
Total	1,754	2,057
Consumer | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
One year prior to current fiscal year	0	0
Two years prior to current fiscal year	0	0
Three years prior to current fiscal year	11	42
Four years prior to current fiscal year	35	4
Prior	0	151
Revolving	198	228
Total	244	425
Consumer | Substandard Impaired
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	7
One year prior to current fiscal year	15	50
Two years prior to current fiscal year	59	193
Three years prior to current fiscal year	25	24
Four years prior to current fiscal year	79	329
Prior	129	183
Revolving	438	21
Total	745	807
Consumer | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
One year prior to current fiscal year	0	0
Two years prior to current fiscal year	0	0
Three years prior to current fiscal year	0	0
Four years prior to current fiscal year	0	0
Prior	0	0
Revolving	0	0
Total	0	0
Paycheck Protection Program
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	182,082	566,961
One year prior to current fiscal year	8,520	0
Two years prior to current fiscal year	0	0
Three years prior to current fiscal year	0	0
Four years prior to current fiscal year	0	0
Prior	0	0
Revolving	0	0
Total	190,602	566,961
Paycheck Protection Program | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	182,082	566,961
One year prior to current fiscal year	8,520	0
Two years prior to current fiscal year	0	0
Three years prior to current fiscal year	0	0
Four years prior to current fiscal year	0	0
Prior	0	0
Revolving	0	0
Total	$ 190,602	$ 566,961