Loans - Loan Portfolio by Credit Quality Indicator (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 989,026	$ 968,814	$ 968,814
Commercial Real Estate Portfolio Segment
Loans and Leases Receivable Disclosure [Line Items]
Loans	658,521	636,336
Construction, land and land development
Loans and Leases Receivable Disclosure [Line Items]
Loans	134,037		96,097
Construction, land and land development | Commercial Real Estate Portfolio Segment
Loans and Leases Receivable Disclosure [Line Items]
Loans	134,037	96,097
Other commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Loans	524,484		540,239
Other commercial real estate | Commercial Real Estate Portfolio Segment
Loans and Leases Receivable Disclosure [Line Items]
Loans	524,484	540,239
Residential real estate
Loans and Leases Receivable Disclosure [Line Items]
Loans	190,969	194,796	194,796
Commercial, financial, & agricultural
Loans and Leases Receivable Disclosure [Line Items]
Loans	116,786	114,360	114,360
Consumer and other
Loans and Leases Receivable Disclosure [Line Items]
Loans	22,750	23,322	$ 23,322
Legacy Loans
Loans and Leases Receivable Disclosure [Line Items]
Loans	840,652	847,100
Legacy Loans | Commercial Real Estate Portfolio Segment
Loans and Leases Receivable Disclosure [Line Items]
Loans	553,029	564,979
Legacy Loans | Construction, land and land development | Commercial Real Estate Portfolio Segment
Loans and Leases Receivable Disclosure [Line Items]
Loans	86,268	83,036
Legacy Loans | Other commercial real estate | Commercial Real Estate Portfolio Segment
Loans and Leases Receivable Disclosure [Line Items]
Loans	466,761	481,943
Legacy Loans | Residential real estate
Loans and Leases Receivable Disclosure [Line Items]
Loans	169,199	171,341
Legacy Loans | Commercial, financial, & agricultural
Loans and Leases Receivable Disclosure [Line Items]
Loans	99,121	91,535
Legacy Loans | Consumer and other
Loans and Leases Receivable Disclosure [Line Items]
Loans	19,303	19,245
Purchased Loans
Loans and Leases Receivable Disclosure [Line Items]
Loans	148,374	121,714
Purchased Loans | Commercial Real Estate Portfolio Segment
Loans and Leases Receivable Disclosure [Line Items]
Loans	105,492	71,357
Purchased Loans | Construction, land and land development | Commercial Real Estate Portfolio Segment
Loans and Leases Receivable Disclosure [Line Items]
Loans	47,769	13,061
Purchased Loans | Other commercial real estate | Commercial Real Estate Portfolio Segment
Loans and Leases Receivable Disclosure [Line Items]
Loans	57,723	58,296
Purchased Loans | Residential real estate
Loans and Leases Receivable Disclosure [Line Items]
Loans	21,770	23,455
Purchased Loans | Commercial, financial, & agricultural
Loans and Leases Receivable Disclosure [Line Items]
Loans	17,665	22,825
Purchased Loans | Consumer and other
Loans and Leases Receivable Disclosure [Line Items]
Loans	3,447	4,077
Pass | Legacy Loans
Loans and Leases Receivable Disclosure [Line Items]
Loans	802,445	806,021
Pass | Legacy Loans | Commercial Real Estate Portfolio Segment
Loans and Leases Receivable Disclosure [Line Items]
Loans	531,118	541,386
Pass | Legacy Loans | Construction, land and land development | Commercial Real Estate Portfolio Segment
Loans and Leases Receivable Disclosure [Line Items]
Loans	85,515	82,322
Pass | Legacy Loans | Other commercial real estate | Commercial Real Estate Portfolio Segment
Loans and Leases Receivable Disclosure [Line Items]
Loans	445,603	459,064
Pass | Legacy Loans | Residential real estate
Loans and Leases Receivable Disclosure [Line Items]
Loans	157,935	159,194
Pass | Legacy Loans | Commercial, financial, & agricultural
Loans and Leases Receivable Disclosure [Line Items]
Loans	94,465	86,558
Pass | Legacy Loans | Consumer and other
Loans and Leases Receivable Disclosure [Line Items]
Loans	18,927	18,883
Pass | Purchased Loans
Loans and Leases Receivable Disclosure [Line Items]
Loans	139,982	117,494
Pass | Purchased Loans | Commercial Real Estate Portfolio Segment
Loans and Leases Receivable Disclosure [Line Items]
Loans	100,853	70,877
Pass | Purchased Loans | Construction, land and land development | Commercial Real Estate Portfolio Segment
Loans and Leases Receivable Disclosure [Line Items]
Loans	45,953	12,996
Pass | Purchased Loans | Other commercial real estate | Commercial Real Estate Portfolio Segment
Loans and Leases Receivable Disclosure [Line Items]
Loans	54,900	57,881
Pass | Purchased Loans | Residential real estate
Loans and Leases Receivable Disclosure [Line Items]
Loans	21,348	23,097
Pass | Purchased Loans | Commercial, financial, & agricultural
Loans and Leases Receivable Disclosure [Line Items]
Loans	14,525	19,443
Pass | Purchased Loans | Consumer and other
Loans and Leases Receivable Disclosure [Line Items]
Loans	3,256	4,077
Special Mention | Legacy Loans
Loans and Leases Receivable Disclosure [Line Items]
Loans	17,941	34,519
Special Mention | Legacy Loans | Commercial Real Estate Portfolio Segment
Loans and Leases Receivable Disclosure [Line Items]
Loans	11,554	13,883
Special Mention | Legacy Loans | Construction, land and land development | Commercial Real Estate Portfolio Segment
Loans and Leases Receivable Disclosure [Line Items]
Loans	431	445
Special Mention | Legacy Loans | Other commercial real estate | Commercial Real Estate Portfolio Segment
Loans and Leases Receivable Disclosure [Line Items]
Loans	11,123	13,438
Special Mention | Legacy Loans | Residential real estate
Loans and Leases Receivable Disclosure [Line Items]
Loans	4,496	4,632
Special Mention | Legacy Loans | Commercial, financial, & agricultural
Loans and Leases Receivable Disclosure [Line Items]
Loans	1,713	1,973
Special Mention | Legacy Loans | Consumer and other
Loans and Leases Receivable Disclosure [Line Items]
Loans	178	148
Special Mention | Purchased Loans
Loans and Leases Receivable Disclosure [Line Items]
Loans	5,565	3,579
Special Mention | Purchased Loans | Commercial Real Estate Portfolio Segment
Loans and Leases Receivable Disclosure [Line Items]
Loans	2,277	381
Special Mention | Purchased Loans | Construction, land and land development | Commercial Real Estate Portfolio Segment
Loans and Leases Receivable Disclosure [Line Items]
Loans	1,698	0
Special Mention | Purchased Loans | Other commercial real estate | Commercial Real Estate Portfolio Segment
Loans and Leases Receivable Disclosure [Line Items]
Loans	579	381
Special Mention | Purchased Loans | Residential real estate
Loans and Leases Receivable Disclosure [Line Items]
Loans	307	249
Special Mention | Purchased Loans | Commercial, financial, & agricultural
Loans and Leases Receivable Disclosure [Line Items]
Loans	2,981	2,949
Special Mention | Purchased Loans | Consumer and other
Loans and Leases Receivable Disclosure [Line Items]
Loans	0	0
Substandard | Legacy Loans
Loans and Leases Receivable Disclosure [Line Items]
Loans	20,266	20,443
Substandard | Legacy Loans | Commercial Real Estate Portfolio Segment
Loans and Leases Receivable Disclosure [Line Items]
Loans	10,357	9,710
Substandard | Legacy Loans | Construction, land and land development | Commercial Real Estate Portfolio Segment
Loans and Leases Receivable Disclosure [Line Items]
Loans	322	269
Substandard | Legacy Loans | Other commercial real estate | Commercial Real Estate Portfolio Segment
Loans and Leases Receivable Disclosure [Line Items]
Loans	10,035	9,441
Substandard | Legacy Loans | Residential real estate
Loans and Leases Receivable Disclosure [Line Items]
Loans	6,768	7,515
Substandard | Legacy Loans | Commercial, financial, & agricultural
Loans and Leases Receivable Disclosure [Line Items]
Loans	2,943	3,004
Substandard | Legacy Loans | Consumer and other
Loans and Leases Receivable Disclosure [Line Items]
Loans	198	214
Substandard | Purchased Loans
Loans and Leases Receivable Disclosure [Line Items]
Loans	2,827	641
Substandard | Purchased Loans | Commercial Real Estate Portfolio Segment
Loans and Leases Receivable Disclosure [Line Items]
Loans	2,362	99
Substandard | Purchased Loans | Construction, land and land development | Commercial Real Estate Portfolio Segment
Loans and Leases Receivable Disclosure [Line Items]
Loans	118	65
Substandard | Purchased Loans | Other commercial real estate | Commercial Real Estate Portfolio Segment
Loans and Leases Receivable Disclosure [Line Items]
Loans	2,244	34
Substandard | Purchased Loans | Residential real estate
Loans and Leases Receivable Disclosure [Line Items]
Loans	115	109
Substandard | Purchased Loans | Commercial, financial, & agricultural
Loans and Leases Receivable Disclosure [Line Items]
Loans	159	433
Substandard | Purchased Loans | Consumer and other
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 191	$ 0