Loans - Age Analysis of Past Due Loans and Nonaccrual Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Financing Receivable, Past Due [Line Items]
Loans	$ 1,101,606	$ 968,814
Legacy Loans
Financing Receivable, Past Due [Line Items]
Accruing Loans Past Due	1,928	1,914
Nonaccrual Loans	7,671	9,179
Current Loans	995,573	836,007
Loans	1,005,172	847,100
Purchased Loans
Financing Receivable, Past Due [Line Items]
Accruing Loans Past Due	295	701
Nonaccrual Loans	2,255	0
Current Loans	93,884	121,013
Loans	96,434	121,714
30-89 Days Past Due | Legacy Loans
Financing Receivable, Past Due [Line Items]
Accruing Loans Past Due	1,928	1,914
30-89 Days Past Due | Purchased Loans
Financing Receivable, Past Due [Line Items]
Accruing Loans Past Due	295	701
90 Days or More Past Due | Legacy Loans
Financing Receivable, Past Due [Line Items]
Accruing Loans Past Due	0	0
90 Days or More Past Due | Purchased Loans
Financing Receivable, Past Due [Line Items]
Accruing Loans Past Due	0	0
Construction, land and land development
Financing Receivable, Past Due [Line Items]
Loans	128,291	96,097
Other commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	509,992	540,239
Residential real estate
Financing Receivable, Past Due [Line Items]
Loans	185,118	194,796
Residential real estate | Legacy Loans
Financing Receivable, Past Due [Line Items]
Accruing Loans Past Due	1,390	1,296
Nonaccrual Loans	3,532	3,643
Current Loans	163,217	166,402
Loans	168,139	171,341
Residential real estate | Purchased Loans
Financing Receivable, Past Due [Line Items]
Accruing Loans Past Due	0	57
Nonaccrual Loans	78	0
Current Loans	16,901	23,398
Loans	16,979	23,455
Residential real estate | 30-89 Days Past Due | Legacy Loans
Financing Receivable, Past Due [Line Items]
Accruing Loans Past Due	1,390	1,296
Residential real estate | 30-89 Days Past Due | Purchased Loans
Financing Receivable, Past Due [Line Items]
Accruing Loans Past Due	0	57
Residential real estate | 90 Days or More Past Due | Legacy Loans
Financing Receivable, Past Due [Line Items]
Accruing Loans Past Due	0	0
Residential real estate | 90 Days or More Past Due | Purchased Loans
Financing Receivable, Past Due [Line Items]
Accruing Loans Past Due	0	0
Commercial, financial, & agricultural
Financing Receivable, Past Due [Line Items]
Loans	254,915	114,360
Commercial, financial, & agricultural | Legacy Loans
Financing Receivable, Past Due [Line Items]
Accruing Loans Past Due	193	212
Nonaccrual Loans	1,451	1,628
Current Loans	240,707	89,695
Loans	242,351	91,535
Commercial, financial, & agricultural | Purchased Loans
Financing Receivable, Past Due [Line Items]
Accruing Loans Past Due	159	553
Nonaccrual Loans	38	0
Current Loans	12,367	22,272
Loans	12,564	22,825
Commercial, financial, & agricultural | 30-89 Days Past Due | Legacy Loans
Financing Receivable, Past Due [Line Items]
Accruing Loans Past Due	193	212
Commercial, financial, & agricultural | 30-89 Days Past Due | Purchased Loans
Financing Receivable, Past Due [Line Items]
Accruing Loans Past Due	159	553
Commercial, financial, & agricultural | 90 Days or More Past Due | Legacy Loans
Financing Receivable, Past Due [Line Items]
Accruing Loans Past Due	0	0
Commercial, financial, & agricultural | 90 Days or More Past Due | Purchased Loans
Financing Receivable, Past Due [Line Items]
Accruing Loans Past Due	0	0
Consumer and other
Financing Receivable, Past Due [Line Items]
Loans	23,290	23,322
Consumer and other | Legacy Loans
Financing Receivable, Past Due [Line Items]
Accruing Loans Past Due	49	21
Nonaccrual Loans	102	138
Current Loans	20,269	19,086
Loans	20,420	19,245
Consumer and other | Purchased Loans
Financing Receivable, Past Due [Line Items]
Accruing Loans Past Due	0	8
Nonaccrual Loans	84	0
Current Loans	2,786	4,069
Loans	2,870	4,077
Consumer and other | 30-89 Days Past Due | Legacy Loans
Financing Receivable, Past Due [Line Items]
Accruing Loans Past Due	49	21
Consumer and other | 30-89 Days Past Due | Purchased Loans
Financing Receivable, Past Due [Line Items]
Accruing Loans Past Due	0	8
Consumer and other | 90 Days or More Past Due | Legacy Loans
Financing Receivable, Past Due [Line Items]
Accruing Loans Past Due	0	0
Consumer and other | 90 Days or More Past Due | Purchased Loans
Financing Receivable, Past Due [Line Items]
Accruing Loans Past Due	0	0
Commercial Real Estate Portfolio Segment
Financing Receivable, Past Due [Line Items]
Loans	638,283	636,336
Commercial Real Estate Portfolio Segment | Legacy Loans
Financing Receivable, Past Due [Line Items]
Accruing Loans Past Due	296	385
Nonaccrual Loans	2,586	3,770
Current Loans	571,380	560,824
Loans	574,262	564,979
Commercial Real Estate Portfolio Segment | Purchased Loans
Financing Receivable, Past Due [Line Items]
Accruing Loans Past Due	136	83
Nonaccrual Loans	2,055	0
Current Loans	61,830	71,274
Loans	64,021	71,357
Commercial Real Estate Portfolio Segment | 30-89 Days Past Due | Legacy Loans
Financing Receivable, Past Due [Line Items]
Accruing Loans Past Due	296	385
Commercial Real Estate Portfolio Segment | 30-89 Days Past Due | Purchased Loans
Financing Receivable, Past Due [Line Items]
Accruing Loans Past Due	136	83
Commercial Real Estate Portfolio Segment | 90 Days or More Past Due | Legacy Loans
Financing Receivable, Past Due [Line Items]
Accruing Loans Past Due	0	0
Commercial Real Estate Portfolio Segment | 90 Days or More Past Due | Purchased Loans
Financing Receivable, Past Due [Line Items]
Accruing Loans Past Due	0	0
Commercial Real Estate Portfolio Segment | Construction, land and land development
Financing Receivable, Past Due [Line Items]
Loans	128,291	96,097
Commercial Real Estate Portfolio Segment | Construction, land and land development | Legacy Loans
Financing Receivable, Past Due [Line Items]
Accruing Loans Past Due	90	50
Nonaccrual Loans	0	32
Current Loans	110,072	82,954
Loans	110,162	83,036
Commercial Real Estate Portfolio Segment | Construction, land and land development | Purchased Loans
Financing Receivable, Past Due [Line Items]
Accruing Loans Past Due	136	0
Nonaccrual Loans	79	0
Current Loans	17,914	13,061
Loans	18,129	13,061
Commercial Real Estate Portfolio Segment | Construction, land and land development | 30-89 Days Past Due | Legacy Loans
Financing Receivable, Past Due [Line Items]
Accruing Loans Past Due	90	50
Commercial Real Estate Portfolio Segment | Construction, land and land development | 30-89 Days Past Due | Purchased Loans
Financing Receivable, Past Due [Line Items]
Accruing Loans Past Due	136	0
Commercial Real Estate Portfolio Segment | Construction, land and land development | 90 Days or More Past Due | Legacy Loans
Financing Receivable, Past Due [Line Items]
Accruing Loans Past Due	0	0
Commercial Real Estate Portfolio Segment | Construction, land and land development | 90 Days or More Past Due | Purchased Loans
Financing Receivable, Past Due [Line Items]
Accruing Loans Past Due	0	0
Commercial Real Estate Portfolio Segment | Other commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	509,992	540,239
Commercial Real Estate Portfolio Segment | Other commercial real estate | Legacy Loans
Financing Receivable, Past Due [Line Items]
Accruing Loans Past Due	206	335
Nonaccrual Loans	2,586	3,738
Current Loans	461,308	477,870
Loans	464,100	481,943
Commercial Real Estate Portfolio Segment | Other commercial real estate | Purchased Loans
Financing Receivable, Past Due [Line Items]
Accruing Loans Past Due	0	83
Nonaccrual Loans	1,976	0
Current Loans	43,916	58,213
Loans	45,892	58,296
Commercial Real Estate Portfolio Segment | Other commercial real estate | 30-89 Days Past Due | Legacy Loans
Financing Receivable, Past Due [Line Items]
Accruing Loans Past Due	206	335
Commercial Real Estate Portfolio Segment | Other commercial real estate | 30-89 Days Past Due | Purchased Loans
Financing Receivable, Past Due [Line Items]
Accruing Loans Past Due	0	83
Commercial Real Estate Portfolio Segment | Other commercial real estate | 90 Days or More Past Due | Legacy Loans
Financing Receivable, Past Due [Line Items]
Accruing Loans Past Due	0	0
Commercial Real Estate Portfolio Segment | Other commercial real estate | 90 Days or More Past Due | Purchased Loans
Financing Receivable, Past Due [Line Items]
Accruing Loans Past Due	$ 0	$ 0