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Loans - Aging of Recorded Investment in Past Due Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Financing Receivable, Past Due [Line Items]
Total ending loans balance	$ 3,511,125	$ 3,371,789
30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	3,295	4,430
60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	1,219	2,430
Greater Than 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	5,405	20,682
Total Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	9,919	27,542
Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	3,501,206	3,344,247
Farmland
Financing Receivable, Past Due [Line Items]
Total ending loans balance	23,417	23,316
Farmland | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	163	195
Farmland | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	388	0
Farmland | Greater Than 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	0	1,211
Farmland | Total Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	551	1,406
Farmland | Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	22,866	21,910
Owner-occupied, nonfarm nonresidential properties
Financing Receivable, Past Due [Line Items]
Total ending loans balance	421,439	407,924
Owner-occupied, nonfarm nonresidential properties | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	533	10
Owner-occupied, nonfarm nonresidential properties | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	0	885
Owner-occupied, nonfarm nonresidential properties | Greater Than 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	826	732
Owner-occupied, nonfarm nonresidential properties | Total Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	1,359	1,627
Owner-occupied, nonfarm nonresidential properties | Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	420,080	406,297
Agricultural production and other loans to farmers
Financing Receivable, Past Due [Line Items]
Total ending loans balance	1,387	2,664
Agricultural production and other loans to farmers | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	0	0
Agricultural production and other loans to farmers | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	0	0
Agricultural production and other loans to farmers | Greater Than 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	0	0
Agricultural production and other loans to farmers | Total Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	0	0
Agricultural production and other loans to farmers | Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	1,387	2,664
Commercial and Industrial
Financing Receivable, Past Due [Line Items]
Total ending loans balance	663,769	663,550
Commercial and Industrial | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	370	476
Commercial and Industrial | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	25	335
Commercial and Industrial | Greater Than 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	212	3,887
Commercial and Industrial | Total Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	607	4,698
Commercial and Industrial | Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	663,162	658,852
Obligations (other than securities and leases) of states and political subdivisions
Financing Receivable, Past Due [Line Items]
Total ending loans balance	139,253	132,818
Obligations (other than securities and leases) of states and political subdivisions | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	0	0
Obligations (other than securities and leases) of states and political subdivisions | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	0	0
Obligations (other than securities and leases) of states and political subdivisions | Greater Than 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	0	0
Obligations (other than securities and leases) of states and political subdivisions | Total Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	0	0
Obligations (other than securities and leases) of states and political subdivisions | Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	139,253	132,818
Other loans
Financing Receivable, Past Due [Line Items]
Total ending loans balance	12,087	11,961
Other loans | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	0	0
Other loans | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	0	0
Other loans | Greater Than 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	0	0
Other loans | Total Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	0	0
Other loans | Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	12,087	11,961
Other construction loans and all land development and other land loans
Financing Receivable, Past Due [Line Items]
Total ending loans balance	280,262	205,734
Other construction loans and all land development and other land loans | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	0	0
Other construction loans and all land development and other land loans | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	0	0
Other construction loans and all land development and other land loans | Greater Than 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	77	1,917
Other construction loans and all land development and other land loans | Total Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	77	1,917
Other construction loans and all land development and other land loans | Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	280,185	203,817
Multifamily (5 or more) residential properties
Financing Receivable, Past Due [Line Items]
Total ending loans balance	213,906	212,815
Multifamily (5 or more) residential properties | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	0	0
Multifamily (5 or more) residential properties | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	0	0
Multifamily (5 or more) residential properties | Greater Than 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	209	0
Multifamily (5 or more) residential properties | Total Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	209	0
Multifamily (5 or more) residential properties | Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	213,697	212,815
Non-owner occupied, nonfarm nonresidential properties
Financing Receivable, Past Due [Line Items]
Total ending loans balance	645,951	640,945
Non-owner occupied, nonfarm nonresidential properties | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	0	314
Non-owner occupied, nonfarm nonresidential properties | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	0	156
Non-owner occupied, nonfarm nonresidential properties | Greater Than 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	1,827	10,184
Non-owner occupied, nonfarm nonresidential properties | Total Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	1,827	10,654
Non-owner occupied, nonfarm nonresidential properties | Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	644,124	630,291
1-4 Family Construction
Financing Receivable, Past Due [Line Items]
Total ending loans balance	31,775	27,768
1-4 Family Construction | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	0	0
1-4 Family Construction | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	0	0
1-4 Family Construction | Greater Than 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	0	0
1-4 Family Construction | Total Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	0	0
1-4 Family Construction | Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	31,775	27,768
Home equity lines of credit
Financing Receivable, Past Due [Line Items]
Total ending loans balance	107,225	109,444
Home equity lines of credit | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	385	166
Home equity lines of credit | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	38	235
Home equity lines of credit | Greater Than 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	152	486
Home equity lines of credit | Total Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	575	887
Home equity lines of credit | Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	106,650	108,557
Residential Mortgages secured by first liens
Financing Receivable, Past Due [Line Items]
Total ending loans balance	810,190	777,030
Residential Mortgages secured by first liens | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	1,350	2,834
Residential Mortgages secured by first liens | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	592	629
Residential Mortgages secured by first liens | Greater Than 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	1,841	1,911
Residential Mortgages secured by first liens | Total Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	3,783	5,374
Residential Mortgages secured by first liens | Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	806,407	771,656
Residential Mortgages secured by junior liens
Financing Receivable, Past Due [Line Items]
Total ending loans balance	57,342	53,726
Residential Mortgages secured by junior liens | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	25	8
Residential Mortgages secured by junior liens | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	0	0
Residential Mortgages secured by junior liens | Greater Than 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	11	66
Residential Mortgages secured by junior liens | Total Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	36	74
Residential Mortgages secured by junior liens | Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	57,306	53,652
Other revolving credit plans
Financing Receivable, Past Due [Line Items]
Total ending loans balance	26,226	25,507
Other revolving credit plans | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	100	36
Other revolving credit plans | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	7	19
Other revolving credit plans | Greater Than 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	0	0
Other revolving credit plans | Total Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	107	55
Other revolving credit plans | Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	26,119	25,452
Automobile
Financing Receivable, Past Due [Line Items]
Total ending loans balance	22,311	25,344
Automobile | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	24	73
Automobile | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	5	0
Automobile | Greater Than 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	0	9
Automobile | Total Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	29	82
Automobile | Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	22,282	25,262
Other consumer
Financing Receivable, Past Due [Line Items]
Total ending loans balance	45,003	42,792
Other consumer | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	290	246
Other consumer | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	163	132
Other consumer | Greater Than 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	217	245
Other consumer | Total Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	670	623
Other consumer | Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	44,333	42,169
Credit cards
Financing Receivable, Past Due [Line Items]
Total ending loans balance	9,313	8,115
Credit cards | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	55	72
Credit cards | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	1	39
Credit cards | Greater Than 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	33	34
Credit cards | Total Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	89	145
Credit cards | Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	9,224	7,970
Overdrafts
Financing Receivable, Past Due [Line Items]
Total ending loans balance	269	336
Overdrafts | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	0	0
Overdrafts | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	0	0
Overdrafts | Greater Than 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	0	0
Overdrafts | Total Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	0	0
Overdrafts | Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Total ending loans balance	$ 269	$ 336

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