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Loans and Allowance - Incurred loss model and interest income recognized while impaired by loan class (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 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	$ 8,834
Impaired loans with related allowance	4,973
Total Impaired Loans	13,807
Interest Income Recognized
Impaired loans with no related allowance	38
Impaired loans with related allowance	22
Total Impaired Loans	60
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	905
Interest Income Recognized
Impaired loans with no related allowance	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
Construction
Average Recorded Investment
Impaired loans with no related allowance	1,015
Interest Income Recognized
Impaired loans with no related allowance	0
Commercial and farmland
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
Average Recorded Investment
Impaired loans with no related allowance	6,852
Impaired loans with related allowance	2,400
Interest Income Recognized
Impaired loans with no related allowance	37
Residential Real Estate
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
Impaired loans with related allowance	2,180
Interest Income Recognized
Impaired loans with no related allowance	1
Impaired loans with related allowance	19
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
Interest Income Recognized
Impaired loans with no related allowance	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	393
Interest Income Recognized
Impaired loans with related allowance	$ 3

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Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

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