Loans and Allowance - Schedule of Composition of Impaired Loans by Loan Class (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2020	Dec. 31, 2020
Unpaid Principal Balance
Impaired loans with no related allowance			$ 9,101
Impaired loans with related allowance			49,513
Total Impaired Loans			58,614
Recorded Investment
Impaired loans with no related allowance			7,813
Impaired loans with related allowance			48,343
Total Impaired Loans			56,156
Related Allowance			12,901
Average Recorded Investment
Impaired loans with no related allowance	$ 12,707	$ 12,980
Impaired loans with related allowance	32,621	32,882
Total Impaired Loans	45,328	45,862
Interest Income Recognized
Impaired loans with no related allowance	38	77
Impaired loans with related allowance	22	44
Total Impaired Loans	60	121
Commercial and industrial loans
Unpaid Principal Balance
Impaired loans with no related allowance			1,059
Impaired loans with related allowance			268
Recorded Investment
Impaired loans with no related allowance			991
Impaired loans with related allowance			268
Related Allowance			223
Average Recorded Investment
Impaired loans with no related allowance	5,008	5,008
Impaired loans with related allowance	10,304	10,304
Interest Income Recognized
Impaired loans with no related allowance	0	0
Impaired loans with related allowance	0	0
Agricultural land, production and other loans to farmers
Unpaid Principal Balance
Impaired loans with related allowance			640
Recorded Investment
Impaired loans with related allowance			562
Related Allowance			3
Commercial real estate, non-owner occupied
Unpaid Principal Balance
Impaired loans with no related allowance			4,958
Impaired loans with related allowance			44,016
Recorded Investment
Impaired loans with no related allowance			4,694
Impaired loans with related allowance			43,715
Related Allowance			11,686
Commercial real estate, owner occupied
Unpaid Principal Balance
Impaired loans with no related allowance			2,125
Impaired loans with related allowance			2,061
Recorded Investment
Impaired loans with no related allowance			1,310
Impaired loans with related allowance			1,323
Related Allowance			557
Commercial and farmland
Average Recorded Investment
Impaired loans with no related allowance	7,637	7,910
Impaired loans with related allowance	18,910	19,156
Interest Income Recognized
Impaired loans with no related allowance	37	75
Impaired loans with related allowance	0	0
Residential
Unpaid Principal Balance
Impaired loans with no related allowance			957
Impaired loans with related allowance			2,041
Recorded Investment
Impaired loans with no related allowance			816
Impaired loans with related allowance			2,014
Related Allowance			352
Average Recorded Investment
Impaired loans with no related allowance	59	59
Impaired loans with related allowance	3,020	3,032
Interest Income Recognized
Impaired loans with no related allowance	1	2
Impaired loans with related allowance	19	38
Individuals' loans for household and other personal expenditures
Unpaid Principal Balance
Impaired loans with no related allowance			2
Recorded Investment
Impaired loans with no related allowance			2
Average Recorded Investment
Impaired loans with no related allowance	3	3
Interest Income Recognized
Impaired loans with no related allowance	0	0
Home equity
Unpaid Principal Balance
Impaired loans with related allowance			487
Recorded Investment
Impaired loans with related allowance			461
Related Allowance			$ 80
Average Recorded Investment
Impaired loans with related allowance	387	390
Interest Income Recognized
Impaired loans with related allowance	$ 3	$ 6