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Loans and Allowance - Composition of Impaired Loans by Loan Class (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Unpaid Principal Balance
Impaired loans with no related allowance	$ 14,777		$ 14,777		$ 9,955
Impaired loans with related allowance	33,527		33,527		5,139
Total Impaired Loans	48,304		48,304		15,094
Recorded Investment
Impaired loans with no related allowance	12,672		12,672		7,352
Impaired loans with related allowance	32,608		32,608		4,357
Total Impaired Loans	45,280		45,280		11,709
Related Allowance	12,999		12,999		689
Average Recorded Investment
Impaired loans with no related allowance	12,707	$ 17,433	12,980	$ 18,112
Impaired loans with related allowance	32,621	5,600	32,882	5,634
Total Impaired Loans	45,328	23,033	45,862	23,746
Interest Income Recognized
Impaired loans with no related allowance	38	40	77	80
Impaired loans with related allowance	22	19	44	38
Total Impaired Loans	60	59	121	118
Commercial and industrial loans
Unpaid Principal Balance
Impaired loans with no related allowance	5,024		5,024		320
Impaired loans with related allowance	10,342		10,342
Recorded Investment
Impaired loans with no related allowance	5,008		5,008		320
Impaired loans with related allowance	10,304		10,304
Related Allowance	7,466		7,466
Average Recorded Investment
Impaired loans with no related allowance	5,008	1,013	5,008	1,021
Impaired loans with related allowance	10,304	940	10,304	940
Interest Income Recognized
Impaired loans with no related allowance	0	0	0	0
Impaired loans with related allowance	0		0	0
Agricultural production financing and other loans to farmers
Unpaid Principal Balance
Impaired loans with no related allowance					299
Recorded Investment
Impaired loans with no related allowance					137
Average Recorded Investment
Impaired loans with no related allowance		668		672
Impaired loans with related allowance		2,117		2,134
Interest Income Recognized
Impaired loans with no related allowance		0		0
Construction
Unpaid Principal Balance
Impaired loans with no related allowance					1,206
Recorded Investment
Impaired loans with no related allowance					970
Average Recorded Investment
Impaired loans with no related allowance		7,314		7,792
Interest Income Recognized
Impaired loans with no related allowance		0		0
Commercial and farmland
Unpaid Principal Balance
Impaired loans with no related allowance	9,675		9,675		8,037
Impaired loans with related allowance	19,650		19,650		2,648
Recorded Investment
Impaired loans with no related allowance	7,602		7,602		5,849
Impaired loans with related allowance	18,910		18,910		1,909
Related Allowance	4,943		4,943		231
Average Recorded Investment
Impaired loans with no related allowance	7,637	7,998	7,910	8,187
Impaired loans with related allowance	18,910	157	19,156	164
Interest Income Recognized
Impaired loans with no related allowance	37	39	75	78
Impaired loans with related allowance				0
Residential
Unpaid Principal Balance
Impaired loans with no related allowance	75		75		93
Impaired loans with related allowance	3,134		3,134		2,070
Recorded Investment
Impaired loans with no related allowance	59		59		76
Impaired loans with related allowance	3,009		3,009		2,044
Related Allowance	520		520		383
Average Recorded Investment
Impaired loans with no related allowance	59	38	59	38
Impaired loans with related allowance	3,020	2,021	3,032	2,029
Interest Income Recognized
Impaired loans with no related allowance	1	1	2	2
Impaired loans with related allowance	19	16	38	32
Home equity
Unpaid Principal Balance
Impaired loans with related allowance	401		401		417
Recorded Investment
Impaired loans with related allowance	385		385		400
Related Allowance	70		70		75
Average Recorded Investment
Impaired loans with no related allowance		49		49
Impaired loans with related allowance	387	351	390	352
Interest Income Recognized
Impaired loans with no related allowance				0
Impaired loans with related allowance	3	3	6	6
Individuals' loans for household and other personal expenditures
Unpaid Principal Balance
Impaired loans with no related allowance	3		3
Impaired loans with related allowance					4
Recorded Investment
Impaired loans with no related allowance	3		3
Impaired loans with related allowance					4
Related Allowance					$ 0
Average Recorded Investment
Impaired loans with no related allowance	$ 3		3
Impaired loans with related allowance		14		15
Interest Income Recognized
Impaired loans with no related allowance			$ 0
Impaired loans with related allowance				0
Public finance and other commercial loans
Average Recorded Investment
Impaired loans with no related allowance		353		353
Interest Income Recognized
Impaired loans with no related allowance		$ 0		$ 0

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