Loans - Schedule of Recorded Investment in Criticized Loans by Class and Credit Quality Indicator (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Residential Real Estate
Loans and Leases Receivable Recorded Investment, Criticized Loans
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	$ 46.0	$ 23.9
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	36.6	75.3
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	72.5	414.0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	399.0	489.4
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	451.4	441.3
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	601.6	257.4
Financing Receivable, Excluding Accrued Interest, Revolving	494.3	477.8
Residential Real Estate | Performing Financial Instruments
Loans and Leases Receivable Recorded Investment, Criticized Loans
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	45.6	22.6
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	35.5	73.8
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	71.5	409.1
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	394.6	487.3
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	449.2	440.2
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	596.8	252.5
Financing Receivable, Excluding Accrued Interest, Revolving	494.2	477.8
Residential Real Estate | Nonperforming Financial Instruments
Loans and Leases Receivable Recorded Investment, Criticized Loans
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0.4	1.3
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	1.1	1.5
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	1.0	4.9
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	4.4	2.1
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	2.2	1.1
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	4.8	4.9
Financing Receivable, Excluding Accrued Interest, Revolving	0.1	0.0
Agricultural Real Estate Financing Receivable [Member]
Loans and Leases Receivable Recorded Investment, Criticized Loans
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	126.9	132.6
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	88.1	61.4
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	46.5	131.2
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	111.4	117.4
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	90.5	78.9
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	143.2	145.7
Financing Receivable, Excluding Accrued Interest, Revolving	21.8	33.4
Indirect consumer
Loans and Leases Receivable Recorded Investment, Criticized Loans
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	31.5	267.7
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	171.0	128.3
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	75.7	168.6
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	103.1	69.5
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	40.5	44.8
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	55.7	46.1
Financing Receivable, Excluding Accrued Interest, Revolving	0.0	0.0
Indirect consumer | Performing Financial Instruments
Loans and Leases Receivable Recorded Investment, Criticized Loans
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	30.8	266.8
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	169.6	127.2
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	74.5	167.5
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	102.1	68.9
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	39.9	44.4
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	54.9	45.6
Financing Receivable, Excluding Accrued Interest, Revolving	0.0	0.0
Indirect consumer | Nonperforming Financial Instruments
Loans and Leases Receivable Recorded Investment, Criticized Loans
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0.7	0.9
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	1.4	1.1
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	1.2	1.1
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	1.0	0.6
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0.6	0.4
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0.8	0.5
Financing Receivable, Excluding Accrued Interest, Revolving	0.0	0.0
Other consumer
Loans and Leases Receivable Recorded Investment, Criticized Loans
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	47.8	46.9
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	25.8	25.5
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	13.4	18.7
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	10.0	10.1
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	5.3	4.2
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	5.1	5.3
Financing Receivable, Excluding Accrued Interest, Revolving	23.9	23.2
Other consumer | Performing Financial Instruments
Loans and Leases Receivable Recorded Investment, Criticized Loans
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	47.7	46.5
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	25.6	25.4
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	13.3	18.5
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	9.9	10.0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	5.3	4.2
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	5.0	5.2
Financing Receivable, Excluding Accrued Interest, Revolving	23.9	23.2
Other consumer | Nonperforming Financial Instruments
Loans and Leases Receivable Recorded Investment, Criticized Loans
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0.1	0.4
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0.2	0.1
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0.1	0.2
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0.1	0.1
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0.0	0.0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0.1	0.1
Financing Receivable, Excluding Accrued Interest, Revolving	0.0	0.0
Credit card consumer
Loans and Leases Receivable Recorded Investment, Criticized Loans
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year		0.0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		0.0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		0.0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		0.0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		0.0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		0.0
Financing Receivable, Excluding Accrued Interest, Revolving		77.6
Credit card consumer | Performing Financial Instruments
Loans and Leases Receivable Recorded Investment, Criticized Loans
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year		0.0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		0.0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		0.0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		0.0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		0.0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		0.0
Financing Receivable, Excluding Accrued Interest, Revolving		76.6
Credit card consumer | Nonperforming Financial Instruments
Loans and Leases Receivable Recorded Investment, Criticized Loans
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year		0.0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year		0.0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year		0.0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year		0.0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year		0.0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		0.0
Financing Receivable, Excluding Accrued Interest, Revolving		1.0
Commercial Portfolio Segment [Member]
Loans and Leases Receivable Recorded Investment, Criticized Loans
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	321.9	473.5
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	325.9	373.9
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	239.0	392.9
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	299.1	324.2
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	233.8	173.7
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	261.5	259.2
Financing Receivable, Excluding Accrued Interest, Revolving	672.3	821.6
Agricultural Financing Receivable [Member]
Loans and Leases Receivable Recorded Investment, Criticized Loans
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	97.6	136.7
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	30.0	61.4
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	21.2	40.4
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	28.4	16.8
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	7.9	14.9
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	5.1	5.9
Financing Receivable, Excluding Accrued Interest, Revolving	315.4	410.4
Commercial Real Estate Portfolio Segment [Member]
Loans and Leases Receivable Recorded Investment, Criticized Loans
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	1,204.9	1,368.4
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,021.1	1,369.8
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	1,172.4	1,946.9
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	1,412.9	1,397.5
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	1,194.3	1,084.8
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	2,029.7	1,901.0
Financing Receivable, Excluding Accrued Interest, Revolving	59.6	75.2
Real Estate Construction Financing Receivable [Member]
Loans and Leases Receivable Recorded Investment, Criticized Loans
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	254.6	443.7
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	217.9	233.0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	110.6	326.6
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	107.0	76.5
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	27.1	17.3
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	21.4	20.9
Financing Receivable, Excluding Accrued Interest, Revolving	86.1	124.8
Pass | Agricultural Real Estate Financing Receivable [Member]
Loans and Leases Receivable Recorded Investment, Criticized Loans
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	100.8	118.6
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	68.5	53.0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	36.5	104.7
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	104.0	107.9
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	73.7	66.0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	121.6	144.1
Financing Receivable, Excluding Accrued Interest, Revolving	19.7	33.4
Pass | Commercial Portfolio Segment [Member]
Loans and Leases Receivable Recorded Investment, Criticized Loans
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	301.3	438.8
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	287.8	353.0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	228.4	375.9
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	277.2	316.0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	225.5	165.9
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	260.4	255.2
Financing Receivable, Excluding Accrued Interest, Revolving	593.3	767.3
Pass | Agricultural Financing Receivable [Member]
Loans and Leases Receivable Recorded Investment, Criticized Loans
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	80.2	109.6
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	25.0	34.1
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	15.1	39.4
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	25.6	16.6
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	7.5	13.5
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	4.7	5.8
Financing Receivable, Excluding Accrued Interest, Revolving	277.8	379.4
Pass | Commercial Real Estate Portfolio Segment [Member]
Loans and Leases Receivable Recorded Investment, Criticized Loans
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	1,025.6	1,208.5
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	948.6	1,340.2
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	1,095.2	1,909.1
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	1,344.8	1,344.1
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	1,101.6	1,069.7
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	1,892.9	1,778.3
Financing Receivable, Excluding Accrued Interest, Revolving	59.0	74.1
Pass | Real Estate Construction Financing Receivable [Member]
Loans and Leases Receivable Recorded Investment, Criticized Loans
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	240.1	438.0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	211.5	233.0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	110.4	320.2
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	92.3	76.5
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	25.4	17.3
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	21.3	20.9
Financing Receivable, Excluding Accrued Interest, Revolving	85.9	124.8
Other Assets Especial Mentioned | Agricultural Real Estate Financing Receivable [Member]
Loans and Leases Receivable Recorded Investment, Criticized Loans
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	10.2	1.1
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	10.1	0.2
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	3.4	6.8
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	4.5	6.1
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	8.7	8.5
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	13.8	0.7
Financing Receivable, Excluding Accrued Interest, Revolving	2.1	0.0
Other Assets Especial Mentioned | Commercial Portfolio Segment [Member]
Loans and Leases Receivable Recorded Investment, Criticized Loans
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	6.4	3.9
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	23.7	13.9
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	3.3	3.1
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	1.4	2.2
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	3.2	6.2
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0.4	0.6
Financing Receivable, Excluding Accrued Interest, Revolving	52.8	19.1
Other Assets Especial Mentioned | Agricultural Financing Receivable [Member]
Loans and Leases Receivable Recorded Investment, Criticized Loans
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	7.9	4.1
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	1.4	1.4
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	2.7	0.9
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	2.0	0.2
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0.4	0.9
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0.0	0.1
Financing Receivable, Excluding Accrued Interest, Revolving	26.0	5.1
Other Assets Especial Mentioned | Commercial Real Estate Portfolio Segment [Member]
Loans and Leases Receivable Recorded Investment, Criticized Loans
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	96.3	78.4
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	28.9	17.5
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	43.7	15.8
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	35.4	16.1
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	64.6	4.9
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	88.4	79.2
Financing Receivable, Excluding Accrued Interest, Revolving	0.6	0.6
Other Assets Especial Mentioned | Real Estate Construction Financing Receivable [Member]
Loans and Leases Receivable Recorded Investment, Criticized Loans
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	3.8	2.1
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	5.0	0.0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0.0	6.4
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	14.4	0.0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0.0	0.0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0.0	0.0
Financing Receivable, Excluding Accrued Interest, Revolving	0.0	0.0
Substandard | Agricultural Real Estate Financing Receivable [Member]
Loans and Leases Receivable Recorded Investment, Criticized Loans
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	15.9	12.9
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	9.5	8.2
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	6.6	19.7
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	2.9	3.4
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	8.1	4.4
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	7.8	0.9
Financing Receivable, Excluding Accrued Interest, Revolving	0.0	0.0
Substandard | Commercial Portfolio Segment [Member]
Loans and Leases Receivable Recorded Investment, Criticized Loans
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	9.3	30.8
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	13.4	5.4
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	6.8	12.8
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	14.2	5.5
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	4.7	1.6
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0.7	3.4
Financing Receivable, Excluding Accrued Interest, Revolving	26.2	35.2
Substandard | Agricultural Financing Receivable [Member]
Loans and Leases Receivable Recorded Investment, Criticized Loans
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	3.3	4.1
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	3.6	25.9
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0.8	0.1
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0.8	0.0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0.0	0.5
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0.4	0.0
Financing Receivable, Excluding Accrued Interest, Revolving	9.6	25.9
Substandard | Commercial Real Estate Portfolio Segment [Member]
Loans and Leases Receivable Recorded Investment, Criticized Loans
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	81.1	81.5
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	41.4	12.1
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	27.8	22.0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	32.7	37.3
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	27.7	10.2
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	48.4	43.5
Financing Receivable, Excluding Accrued Interest, Revolving	0.0	0.5
Substandard | Real Estate Construction Financing Receivable [Member]
Loans and Leases Receivable Recorded Investment, Criticized Loans
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	10.7	0.0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0.1	0.0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0.2	0.0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0.3	0.0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	1.0	0.0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0.1	0.0
Financing Receivable, Excluding Accrued Interest, Revolving	0.2	0.0
Doubtful | Agricultural Real Estate Financing Receivable [Member]
Loans and Leases Receivable Recorded Investment, Criticized Loans
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0.0	0.0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0.0	0.0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0.0	0.0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0.0	0.0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0.0	0.0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0.0	0.0
Financing Receivable, Excluding Accrued Interest, Revolving	0.0	0.0
Doubtful | Commercial Portfolio Segment [Member]
Loans and Leases Receivable Recorded Investment, Criticized Loans
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	4.9	0.0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	1.0	1.6
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0.5	1.1
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	6.3	0.5
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0.4	0.0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0.0	0.0
Financing Receivable, Excluding Accrued Interest, Revolving	0.0	0.0
Doubtful | Agricultural Financing Receivable [Member]
Loans and Leases Receivable Recorded Investment, Criticized Loans
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	6.2	18.9
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0.0	0.0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	2.6	0.0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0.0	0.0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0.0	0.0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0.0	0.0
Financing Receivable, Excluding Accrued Interest, Revolving	2.0	0.0
Doubtful | Commercial Real Estate Portfolio Segment [Member]
Loans and Leases Receivable Recorded Investment, Criticized Loans
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	1.9	0.0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	2.2	0.0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	5.7	0.0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0.0	0.0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0.4	0.0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0.0	0.0
Financing Receivable, Excluding Accrued Interest, Revolving	0.0	0.0
Doubtful | Real Estate Construction Financing Receivable [Member]
Loans and Leases Receivable Recorded Investment, Criticized Loans
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0.0	3.6
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	1.3	0.0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0.0	0.0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0.0	0.0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0.7	0.0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0.0	0.0
Financing Receivable, Excluding Accrued Interest, Revolving	$ 0.0	$ 0.0