Loans - Age Analysis of Past Due Loans and Nonaccrual Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019
Financing Receivable, Past Due [Line Items]
Loans	$ 989,026	$ 968,814	$ 968,814
Legacy Loans
Financing Receivable, Past Due [Line Items]
Accruing Loans Past Due	3,962	1,914
Nonaccrual Loans	10,130	9,179
Current Loans	826,560	836,007
Loans	840,652	847,100
Purchased Loans
Financing Receivable, Past Due [Line Items]
Accruing Loans Past Due	683	701
Nonaccrual Loans	0	0
Current Loans	147,691	121,013
Loans	148,374	121,714
30-89 Days Past Due | Legacy Loans
Financing Receivable, Past Due [Line Items]
Accruing Loans Past Due	3,962	1,914
30-89 Days Past Due | Purchased Loans
Financing Receivable, Past Due [Line Items]
Accruing Loans Past Due	683	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
Residential real estate
Financing Receivable, Past Due [Line Items]
Loans	190,969	194,796	194,796
Residential real estate | Legacy Loans
Financing Receivable, Past Due [Line Items]
Accruing Loans Past Due	1,635	1,296
Nonaccrual Loans	3,336	3,643
Current Loans	164,228	166,402
Loans	169,199	171,341
Residential real estate | Purchased Loans
Financing Receivable, Past Due [Line Items]
Accruing Loans Past Due	0	57
Nonaccrual Loans	0	0
Current Loans	21,770	23,398
Loans	21,770	23,455
Residential real estate | 30-89 Days Past Due | Legacy Loans
Financing Receivable, Past Due [Line Items]
Accruing Loans Past Due	1,635	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	116,786	114,360	114,360
Commercial, financial, & agricultural | Legacy Loans
Financing Receivable, Past Due [Line Items]
Accruing Loans Past Due	531	212
Nonaccrual Loans	2,779	1,628
Current Loans	95,811	89,695
Loans	99,121	91,535
Commercial, financial, & agricultural | Purchased Loans
Financing Receivable, Past Due [Line Items]
Accruing Loans Past Due	0	553
Nonaccrual Loans	0	0
Current Loans	17,665	22,272
Loans	17,665	22,825
Commercial, financial, & agricultural | 30-89 Days Past Due | Legacy Loans
Financing Receivable, Past Due [Line Items]
Accruing Loans Past Due	531	212
Commercial, financial, & agricultural | 30-89 Days Past Due | Purchased Loans
Financing Receivable, Past Due [Line Items]
Accruing Loans Past Due	0	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	22,750	23,322	23,322
Consumer and other | Legacy Loans
Financing Receivable, Past Due [Line Items]
Accruing Loans Past Due	113	21
Nonaccrual Loans	129	138
Current Loans	19,061	19,086
Loans	19,303	19,245
Consumer and other | Purchased Loans
Financing Receivable, Past Due [Line Items]
Accruing Loans Past Due	4	8
Nonaccrual Loans	0	0
Current Loans	3,443	4,069
Loans	3,447	4,077
Consumer and other | 30-89 Days Past Due | Legacy Loans
Financing Receivable, Past Due [Line Items]
Accruing Loans Past Due	113	21
Consumer and other | 30-89 Days Past Due | Purchased Loans
Financing Receivable, Past Due [Line Items]
Accruing Loans Past Due	4	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
Construction, land and land development
Financing Receivable, Past Due [Line Items]
Loans	134,037		96,097
Other commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	524,484		$ 540,239
Commercial Real Estate Portfolio Segment
Financing Receivable, Past Due [Line Items]
Loans	658,521	636,336
Commercial Real Estate Portfolio Segment | Legacy Loans
Financing Receivable, Past Due [Line Items]
Accruing Loans Past Due	1,683	385
Nonaccrual Loans	3,886	3,770
Current Loans	547,460	560,824
Loans	553,029	564,979
Commercial Real Estate Portfolio Segment | Purchased Loans
Financing Receivable, Past Due [Line Items]
Accruing Loans Past Due	679	83
Nonaccrual Loans	0	0
Current Loans	104,813	71,274
Loans	105,492	71,357
Commercial Real Estate Portfolio Segment | 30-89 Days Past Due | Legacy Loans
Financing Receivable, Past Due [Line Items]
Accruing Loans Past Due	1,683	385
Commercial Real Estate Portfolio Segment | 30-89 Days Past Due | Purchased Loans
Financing Receivable, Past Due [Line Items]
Accruing Loans Past Due	679	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	134,037	96,097
Commercial Real Estate Portfolio Segment | Construction, land and land development | Legacy Loans
Financing Receivable, Past Due [Line Items]
Accruing Loans Past Due	293	50
Nonaccrual Loans	81	32
Current Loans	85,894	82,954
Loans	86,268	83,036
Commercial Real Estate Portfolio Segment | Construction, land and land development | Purchased Loans
Financing Receivable, Past Due [Line Items]
Accruing Loans Past Due	679	0
Nonaccrual Loans	0	0
Current Loans	47,090	13,061
Loans	47,769	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	293	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	679	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	524,484	540,239
Commercial Real Estate Portfolio Segment | Other commercial real estate | Legacy Loans
Financing Receivable, Past Due [Line Items]
Accruing Loans Past Due	1,390	335
Nonaccrual Loans	3,805	3,738
Current Loans	461,566	477,870
Loans	466,761	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	0	0
Current Loans	57,723	58,213
Loans	57,723	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	1,390	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