Loans - Schedule of Allowance for Losses by Impairment Method and Commodity (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Ending Balance:
Total	$ 6,825,061	$ 5,390,977
Allowance for Losses:
Total	$ 15,821	10,454
On-Balance Sheet:
Ending Balance:
Collectively evaluated for impairment:		5,069,480
Individually evaluated for impairment:		207,077
Total		5,276,557
Allowance for Losses:
Collectively evaluated for impairment:		4,256
Individually evaluated for impairment:		6,198
Total		10,454
On-Balance Sheet: | Crops
Ending Balance:
Collectively evaluated for impairment:		2,664,362
Individually evaluated for impairment:		108,815
Total		2,773,177
Allowance for Losses:
Collectively evaluated for impairment:		1,880
Individually evaluated for impairment:		2,628
Total		4,508
On-Balance Sheet: | Permanent Plantings
Ending Balance:
Collectively evaluated for impairment:		1,161,900
Individually evaluated for impairment:		51,256
Total		1,213,156
Allowance for Losses:
Collectively evaluated for impairment:		1,362
Individually evaluated for impairment:		1,008
Total		2,370
On-Balance Sheet: | Livestock
Ending Balance:
Collectively evaluated for impairment:		871,341
Individually evaluated for impairment:		39,962
Total		911,303
Allowance for Losses:
Collectively evaluated for impairment:		714
Individually evaluated for impairment:		2,447
Total		3,161
On-Balance Sheet: | Part-time Farm
Ending Balance:
Collectively evaluated for impairment:		356,920
Individually evaluated for impairment:		7,044
Total		363,964
Allowance for Losses:
Collectively evaluated for impairment:		249
Individually evaluated for impairment:		115
Total		364
On-Balance Sheet: | Ag. Storage and Processing
Ending Balance:
Collectively evaluated for impairment:		10,360
Individually evaluated for impairment:		0
Total		10,360
Allowance for Losses:
Collectively evaluated for impairment:		47
Individually evaluated for impairment:		0
Total		47
On-Balance Sheet: | Other
Ending Balance:
Collectively evaluated for impairment:		4,597
Individually evaluated for impairment:		0
Total		4,597
Allowance for Losses:
Collectively evaluated for impairment:		4
Individually evaluated for impairment:		0
Total		$ 4