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Loans and Allowance - Composition of Impaired Loans by Loan Class (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Unpaid Principal Balance
Impaired loans with no related allowance	$ 9,101	$ 9,955	$ 14,555
Impaired loans with related allowance	49,513	5,139	10,501
Total Impaired Loans	58,614	15,094	25,056
Recorded Investment
Impaired loans with no related allowance	7,813	7,352	11,594
Impaired loans with related allowance	48,343	4,357	10,431
Total Impaired Loans	56,156	11,709	22,025
Related Allowance	12,901	689	1,872
Average Recorded Investment
Impaired loans with no related allowance	8,113	7,924	15,824
Impaired loans with related allowance	49,003	4,405	10,448
Total Impaired Loans	57,116	12,329	26,272
Interest Income Recognized
Impaired loans with no related allowance	148	159	168
Impaired loans with related allowance	84	75	68
Total Impaired Loans	232	234	236
Commercial and industrial loans
Unpaid Principal Balance
Impaired loans with no related allowance	1,059	320	828
Impaired loans with related allowance	268
Recorded Investment
Impaired loans with no related allowance	991	320	806
Impaired loans with related allowance	268
Related Allowance	223
Average Recorded Investment
Impaired loans with no related allowance	991	320	833
Impaired loans with related allowance	267
Interest Income Recognized
Impaired loans with no related allowance	0	0	0
Impaired loans with related allowance	0
Agricultural land, production and other loans to farmers
Unpaid Principal Balance
Impaired loans with no related allowance		752	679
Impaired loans with related allowance	640	588
Recorded Investment
Impaired loans with no related allowance		381	679
Impaired loans with related allowance	562	585
Related Allowance	3	107
Average Recorded Investment
Impaired loans with no related allowance		542	1,213
Impaired loans with related allowance	589	585
Interest Income Recognized
Impaired loans with no related allowance		0	0
Impaired loans with related allowance	0	0
Construction
Unpaid Principal Balance
Impaired loans with no related allowance		1,206	1,352
Impaired loans with related allowance			7,978
Recorded Investment
Impaired loans with no related allowance		970	614
Impaired loans with related allowance			7,977
Related Allowance			1,429
Average Recorded Investment
Impaired loans with no related allowance		1,229	835
Impaired loans with related allowance			7,977
Interest Income Recognized
Impaired loans with no related allowance		0	0
Impaired loans with related allowance			0
Commercial real estate, non-owner occupied
Unpaid Principal Balance
Impaired loans with no related allowance	4,958	6,202	7,795
Impaired loans with related allowance	44,016
Recorded Investment
Impaired loans with no related allowance	4,694	5,299	6,891
Impaired loans with related allowance	43,715
Related Allowance	11,686
Average Recorded Investment
Impaired loans with no related allowance	4,850	5,399	10,239
Impaired loans with related allowance	44,119
Interest Income Recognized
Impaired loans with no related allowance	145	156	0
Impaired loans with related allowance	0
Commercial real estate, owner occupied
Unpaid Principal Balance
Impaired loans with no related allowance	2,125	1,382	3,381
Impaired loans with related allowance	2,061	2,060	171
Recorded Investment
Impaired loans with no related allowance	1,310	306	2,103
Impaired loans with related allowance	1,323	1,324	171
Related Allowance	557	124	6
Average Recorded Investment
Impaired loans with no related allowance	1,429	357	2,202
Impaired loans with related allowance	1,447	1,324	171
Interest Income Recognized
Impaired loans with no related allowance	0	0	165
Impaired loans with related allowance	0	0
Residential
Unpaid Principal Balance
Impaired loans with no related allowance	957	93	118
Impaired loans with related allowance	2,041	2,070	1,958
Recorded Investment
Impaired loans with no related allowance	816	76	100
Impaired loans with related allowance	2,014	2,044	1,907
Related Allowance	352	383	362
Average Recorded Investment
Impaired loans with no related allowance	840	77	101
Impaired loans with related allowance	2,108	2,083	1,915
Interest Income Recognized
Impaired loans with no related allowance	3	3	3
Impaired loans with related allowance	70	63	57
Home equity
Unpaid Principal Balance
Impaired loans with no related allowance			49
Impaired loans with related allowance	487	417	376
Recorded Investment
Impaired loans with no related allowance			48
Impaired loans with related allowance	461	400	358
Related Allowance	80	75	74
Average Recorded Investment
Impaired loans with no related allowance			48
Impaired loans with related allowance	473	409	365
Interest Income Recognized
Impaired loans with no related allowance			0
Impaired loans with related allowance	14	12	10
Individuals' loans for household and other personal expenditures
Unpaid Principal Balance
Impaired loans with no related allowance	2
Impaired loans with related allowance		4	18
Recorded Investment
Impaired loans with no related allowance	2
Impaired loans with related allowance		4	18
Related Allowance		0	1
Average Recorded Investment
Impaired loans with no related allowance	3
Impaired loans with related allowance		4	20
Interest Income Recognized
Impaired loans with no related allowance	$ 0
Impaired loans with related allowance		$ 0	1
Public finance and other commercial loans
Unpaid Principal Balance
Impaired loans with no related allowance			353
Recorded Investment
Impaired loans with no related allowance			353
Average Recorded Investment
Impaired loans with no related allowance			353
Interest Income Recognized
Impaired loans with no related allowance			$ 0

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