Loans - Risk Categories of Loans by Class of Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	$ 452,116	$ 1,309,434
One year prior to current fiscal year	1,111,692	912,701
Two years prior to current fiscal year	860,674	779,840
Three years prior to current fiscal year	699,000	589,022
Four years prior to current fiscal year	536,244	582,417
Prior	1,406,464	928,105
Revolving	595,302	633,830
Total	5,661,492	5,735,349
Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	452,116	1,302,389
One year prior to current fiscal year	1,105,052	898,213
Two years prior to current fiscal year	846,099	741,734
Three years prior to current fiscal year	660,955	562,336
Four years prior to current fiscal year	503,893	553,531
Prior	1,341,779	885,576
Revolving	589,558	628,070
Total	5,499,452	5,571,849
Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	6,108
One year prior to current fiscal year	6,007	3,507
Two years prior to current fiscal year	3,259	19,722
Three years prior to current fiscal year	20,264	13,953
Four years prior to current fiscal year	18,962	14,820
Prior	19,283	7,235
Revolving	3,291	2,544
Total	71,066	67,889
Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	504
One year prior to current fiscal year	153	41
Two years prior to current fiscal year	41	12,725
Three years prior to current fiscal year	12,244	7,256
Four years prior to current fiscal year	5,728	10,823
Prior	22,830	14,083
Revolving	484	1,092
Total	41,480	46,524
Substandard Impaired
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	433
One year prior to current fiscal year	480	10,940
Two years prior to current fiscal year	11,275	5,659
Three years prior to current fiscal year	5,037	5,477
Four years prior to current fiscal year	7,661	3,243
Prior	22,572	21,211
Revolving	1,969	2,104
Total	48,994	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	500	0
Four years prior to current fiscal year	0	0
Prior	0	0
Revolving	0	20
Total	500	20
Construction and land development
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	11,721	62,313
One year prior to current fiscal year	61,751	52,629
Two years prior to current fiscal year	41,791	51,985
Three years prior to current fiscal year	36,229	15,910
Four years prior to current fiscal year	12,106	7,335
Prior	25,904	19,612
Revolving	37,615	35,324
Total	227,117	245,108
Construction and land development | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	11,721	62,107
One year prior to current fiscal year	61,751	52,384
Two years prior to current fiscal year	41,791	46,067
Three years prior to current fiscal year	27,743	15,873
Four years prior to current fiscal year	12,069	7,335
Prior	24,206	17,873
Revolving	37,615	35,324
Total	216,896	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	8,486	0
Four years prior to current fiscal year	0	0
Prior	262	1,449
Revolving	0	0
Total	8,748	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	1,212	51
Revolving	0	0
Total	1,212	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	37	0
Prior	224	239
Revolving	0	0
Total	261	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	39,915	161,726
One year prior to current fiscal year	159,018	203,568
Two years prior to current fiscal year	200,267	160,328
Three years prior to current fiscal year	152,561	144,412
Four years prior to current fiscal year	138,569	154,815
Prior	429,691	302,204
Revolving	13,064	14,257
Total	1,133,085	1,141,310
Commercial real estate - owner-occupied | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	39,915	155,953
One year prior to current fiscal year	153,127	198,559
Two years prior to current fiscal year	195,476	156,276
Three years prior to current fiscal year	150,551	138,341
Four years prior to current fiscal year	132,555	148,389
Prior	412,493	287,772
Revolving	13,064	14,255
Total	1,097,181	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	5,891	1,858
Two years prior to current fiscal year	1,839	3,305
Three years prior to current fiscal year	1,294	0
Four years prior to current fiscal year	0	4,471
Prior	8,202	4,050
Revolving	0	2
Total	17,226	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	0	4,709
Four years prior to current fiscal year	4,152	1,955
Prior	5,423	5,508
Revolving	0	0
Total	9,575	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	2,952	747
Three years prior to current fiscal year	716	1,362
Four years prior to current fiscal year	1,862	0
Prior	3,573	4,874
Revolving	0	0
Total	9,103	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	79,711	159,299
One year prior to current fiscal year	161,211	316,136
Two years prior to current fiscal year	313,925	220,308
Three years prior to current fiscal year	207,944	130,937
Four years prior to current fiscal year	128,382	194,299
Prior	538,108	366,279
Revolving	9,084	8,596
Total	1,438,365	1,395,854
Commercial real estate - non owner-occupied | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	79,711	159,299
One year prior to current fiscal year	161,211	313,287
Two years prior to current fiscal year	311,098	201,112
Three years prior to current fiscal year	188,793	123,357
Four years prior to current fiscal year	111,807	175,623
Prior	510,852	356,943
Revolving	9,084	8,596
Total	1,372,556	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	430	9,487
Three years prior to current fiscal year	9,443	7,580
Four years prior to current fiscal year	16,575	10,240
Prior	9,800	114
Revolving	0	0
Total	36,248	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	0	0
Two years prior to current fiscal year	0	9,709
Three years prior to current fiscal year	9,708	0
Four years prior to current fiscal year	0	8,311
Prior	11,981	3,682
Revolving	0	0
Total	21,689	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	2,397	0
Three years prior to current fiscal year	0	0
Four years prior to current fiscal year	0	125
Prior	5,475	5,540
Revolving	0	0
Total	7,872	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	21,192	97,278
One year prior to current fiscal year	118,812	145,055
Two years prior to current fiscal year	126,719	205,630
Three years prior to current fiscal year	176,247	208,424
Four years prior to current fiscal year	181,218	161,327
Prior	291,385	171,831
Revolving	330,976	353,083
Total	1,246,549	1,342,628
Residential real estate | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	21,192	96,819
One year prior to current fiscal year	118,310	144,329
Two years prior to current fiscal year	125,666	204,077
Three years prior to current fiscal year	174,835	205,046
Four years prior to current fiscal year	175,133	160,612
Prior	280,387	159,742
Revolving	327,456	350,502
Total	1,222,979	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	49	0
Two years prior to current fiscal year	0	33
Three years prior to current fiscal year	70	720
Four years prior to current fiscal year	2,069	0
Prior	319	966
Revolving	1,579	479
Total	4,086	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	388	1,452
Revolving	40	100
Total	428	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	453	726
Two years prior to current fiscal year	1,053	1,520
Three years prior to current fiscal year	1,342	1,762
Four years prior to current fiscal year	4,016	715
Prior	10,291	9,671
Revolving	1,901	2,002
Total	19,056	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	60,114	215,316
One year prior to current fiscal year	218,787	152,093
Two years prior to current fiscal year	140,271	110,949
Three years prior to current fiscal year	99,476	70,295
Four years prior to current fiscal year	59,640	42,386
Prior	92,962	58,336
Revolving	189,563	205,378
Total	860,813	854,753
Commercial and financial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	60,114	214,774
One year prior to current fiscal year	218,567	146,511
Two years prior to current fiscal year	134,501	103,769
Three years prior to current fiscal year	92,551	60,782
Four years prior to current fiscal year	56,103	39,692
Prior	86,551	53,758
Revolving	188,805	204,304
Total	837,192	823,590
Commercial and financial | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	71
One year prior to current fiscal year	67	946
Two years prior to current fiscal year	905	965
Three years prior to current fiscal year	919	5,612
Four years prior to current fiscal year	293	67
Prior	95	635
Revolving	436	209
Total	2,715	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	153	41
Two years prior to current fiscal year	41	3,016
Three years prior to current fiscal year	2,536	1,609
Four years prior to current fiscal year	1,560	553
Prior	3,826	3,239
Revolving	254	764
Total	8,370	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	4,824	3,199
Three years prior to current fiscal year	2,970	2,292
Four years prior to current fiscal year	1,684	2,074
Prior	2,490	704
Revolving	68	81
Total	12,036	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	500	0
Four years prior to current fiscal year	0	0
Prior	0	0
Revolving	0	20
Total	500	20
Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	7,025	46,541
One year prior to current fiscal year	42,898	43,220
Two years prior to current fiscal year	37,701	30,640
Three years prior to current fiscal year	26,543	19,044
Four years prior to current fiscal year	16,329	22,255
Prior	28,414	9,843
Revolving	15,000	17,192
Total	173,910	188,735
Consumer | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	7,025	46,476
One year prior to current fiscal year	42,871	43,143
Two years prior to current fiscal year	37,567	30,433
Three years prior to current fiscal year	26,482	18,937
Four years prior to current fiscal year	16,226	21,880
Prior	27,290	9,488
Revolving	13,534	15,089
Total	170,995	185,446
Consumer | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	58
One year prior to current fiscal year	0	27
Two years prior to current fiscal year	85	14
Three years prior to current fiscal year	52	41
Four years prior to current fiscal year	25	42
Prior	605	21
Revolving	1,276	1,854
Total	2,043	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	0	42
Four years prior to current fiscal year	16	4
Prior	0	151
Revolving	190	228
Total	206	425
Consumer | Substandard Impaired
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	7
One year prior to current fiscal year	27	50
Two years prior to current fiscal year	49	193
Three years prior to current fiscal year	9	24
Four years prior to current fiscal year	62	329
Prior	519	183
Revolving	0	21
Total	666	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	232,438	566,961
One year prior to current fiscal year	349,215	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	581,653	566,961
Paycheck Protection Program | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	232,438	566,961
One year prior to current fiscal year	349,215	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	$ 581,653	$ 566,961