Acquired Loans - Acquired Loans by Loan Class and Credit Quality Indicator (Details) $ in Thousands	Dec. 31, 2019 USD ($)
Acquired Loans, Commercial Loans [Abstract]
Acquired loans	$ 71,786
Acquired Loans, Aging [Abstract]
Current	70,305
Acquired Loans, Past Due	2,296
Nonaccrual	0	[1]
Total Acquired Loans	72,601
Past Due 90 Days or More [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	1,307	[2]
Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Aging [Abstract]
Current	4,639
Acquired Loans, Past Due	132
Nonaccrual	0	[1]
Total Acquired Loans	4,771
Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member] | Past Due 90 Days or More [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	38	[2]
Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Aging [Abstract]
Current	16,332
Acquired Loans, Past Due	1,193
Nonaccrual	0	[1]
Total Acquired Loans	17,525
Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member] | Past Due 90 Days or More [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	366	[2]
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Aging [Abstract]
Current	37,319
Acquired Loans, Past Due	887
Nonaccrual	0	[1]
Total Acquired Loans	38,206
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member] | Past Due 90 Days or More [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	851	[2]
Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Aging [Abstract]
Current	3,893
Acquired Loans, Past Due	53
Nonaccrual	0	[1]
Total Acquired Loans	3,946
Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member] | Past Due 90 Days or More [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	52	[2]
Commercial and Industrial Loans [Member]
Acquired Loans, Aging [Abstract]
Current	5,035
Acquired Loans, Past Due	0
Nonaccrual	0	[1]
Total Acquired Loans	5,035
Commercial and Industrial Loans [Member] | Past Due 90 Days or More [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	0	[2]
Consumer Loans [Member]
Acquired Loans, Aging [Abstract]
Current	489
Acquired Loans, Past Due	31
Nonaccrual	0	[1]
Total Acquired Loans	520
Consumer Loans [Member] | Past Due 90 Days or More [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	0	[2]
Other Loans [Member]
Acquired Loans, Aging [Abstract]
Current	2,598
Acquired Loans, Past Due	0
Nonaccrual	0	[1]
Total Acquired Loans	2,598
Other Loans [Member] | Past Due 90 Days or More [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	0	[2]
Commercial LHFI [Member] | Commercial Loan [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans	57,785
Commercial LHFI [Member] | Pass Categories 1-6 [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans	44,922
Commercial LHFI [Member] | Special Mention Category 7 [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans	42
Commercial LHFI [Member] | Substandard Category 8 [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans	10,819
Commercial LHFI [Member] | Doubtful Category 9 [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans	2,002
Commercial LHFI [Member] | Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member] | Commercial Loan [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans	4,214
Commercial LHFI [Member] | Construction, Land Development and Other Land [Member] | Pass Categories 1-6 [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans	4,022
Commercial LHFI [Member] | Construction, Land Development and Other Land [Member] | Substandard Category 8 [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans	192
Commercial LHFI [Member] | Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member] | Commercial Loan [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans	3,786
Commercial LHFI [Member] | Secured by 1-4 Family Residential Properties [Member] | Pass Categories 1-6 [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans	3,164
Commercial LHFI [Member] | Secured by 1-4 Family Residential Properties [Member] | Special Mention Category 7 [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans	42
Commercial LHFI [Member] | Secured by 1-4 Family Residential Properties [Member] | Substandard Category 8 [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans	580
Commercial LHFI [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member] | Commercial Loan [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans	38,206
Commercial LHFI [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Pass Categories 1-6 [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans	27,848
Commercial LHFI [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Substandard Category 8 [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans	9,972
Commercial LHFI [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Doubtful Category 9 [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans	386
Commercial LHFI [Member] | Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member] | Commercial Loan [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans	3,946
Commercial LHFI [Member] | Other Real Estate Secured [Member] | Pass Categories 1-6 [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans	3,878
Commercial LHFI [Member] | Other Real Estate Secured [Member] | Substandard Category 8 [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans	68
Commercial LHFI [Member] | Other Real Estate Secured [Member] | Doubtful Category 9 [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans	0
Commercial LHFI [Member] | Commercial and Industrial Loans [Member] | Commercial Loan [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans	5,035
Commercial LHFI [Member] | Commercial and Industrial Loans [Member] | Pass Categories 1-6 [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans	3,419
Commercial LHFI [Member] | Commercial and Industrial Loans [Member] | Doubtful Category 9 [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans	1,616
Commercial LHFI [Member] | Other Loans [Member] | Commercial Loan [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans	2,598
Commercial LHFI [Member] | Other Loans [Member] | Pass Categories 1-6 [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans	2,591
Commercial LHFI [Member] | Other Loans [Member] | Substandard Category 8 [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans	7
Consumer LHFI [Member]
Acquired Loans, Aging [Abstract]
Current	13,795
Subtotal	14,816
Total Acquired Loans	72,601
Consumer LHFI [Member] | Past Due 30-89 Days [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	740
Consumer LHFI [Member] | Past Due 90 Days or More [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	281
Consumer LHFI [Member] | Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Aging [Abstract]
Current	463
Subtotal	557
Total Acquired Loans	4,771
Consumer LHFI [Member] | Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member] | Past Due 30-89 Days [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	94
Consumer LHFI [Member] | Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Aging [Abstract]
Current	12,843
Subtotal	13,739
Total Acquired Loans	17,525
Consumer LHFI [Member] | Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member] | Past Due 30-89 Days [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	615
Consumer LHFI [Member] | Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member] | Past Due 90 Days or More [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	281
Consumer LHFI [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Aging [Abstract]
Total Acquired Loans	38,206
Consumer LHFI [Member] | Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Aging [Abstract]
Total Acquired Loans	3,946
Consumer LHFI [Member] | Commercial and Industrial Loans [Member]
Acquired Loans, Aging [Abstract]
Total Acquired Loans	5,035
Consumer LHFI [Member] | Consumer Loans [Member]
Acquired Loans, Aging [Abstract]
Current	489
Subtotal	520
Total Acquired Loans	520
Consumer LHFI [Member] | Consumer Loans [Member] | Past Due 30-89 Days [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	31
Consumer LHFI [Member] | Other Loans [Member]
Acquired Loans, Aging [Abstract]
Total Acquired Loans	$ 2,598

[1] Acquired loans not accounted for under FASB ASC Subtopic 310-30.

[2] Past due 90 days or more but still accruing interest.