Loan and Lease Financings (Details 3) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2024 USD ($) item	Mar. 31, 2023 USD ($) item	Mar. 31, 2024 USD ($)
Loan modifications to borrowers experiencing financial difficulties
Percent of Total Segment of Financing Receivable	0.39%	0.08%
Commitments to lend additional amounts	$ 2,630	$ 0	$ 2,630
Weighted Average Interest Rate Reduction		3.00%	0.00%
Weighted Average Term Extension Modification (in months)		4 months	4 months
Weighted Average Payment Delay (in months)		0 months	6 months
Combination Weighted Average Payment Delay and Term Extension (in months)		0 months	5 months
Loan modifications to borrowers experiencing financial difficulties subsequent default | item	0	0
Combination Payment Delay and Term Extension
Loan modifications to borrowers experiencing financial difficulties
Loan modifications to borrowers experiencing financial difficulties	$ 25,583	$ 0
Payment Delay
Loan modifications to borrowers experiencing financial difficulties
Loan modifications to borrowers experiencing financial difficulties	0	0
Term Extension
Loan modifications to borrowers experiencing financial difficulties
Loan modifications to borrowers experiencing financial difficulties	108	4,664
Interest Rate Reduction
Loan modifications to borrowers experiencing financial difficulties
Loan modifications to borrowers experiencing financial difficulties	$ 0	511
Current
Loan modifications to borrowers experiencing financial difficulties
Loan modifications to borrowers experiencing financial difficulties		5,175	$ 39,721
30 to 59 Days Past Due
Loan modifications to borrowers experiencing financial difficulties
Loan modifications to borrowers experiencing financial difficulties		0	0
60 to 89 Days Past Due
Loan modifications to borrowers experiencing financial difficulties
Loan modifications to borrowers experiencing financial difficulties		0	0
90 Days or More Past Due
Loan modifications to borrowers experiencing financial difficulties
Loan modifications to borrowers experiencing financial difficulties		0	1,869
Total Past Due
Loan modifications to borrowers experiencing financial difficulties
Loan modifications to borrowers experiencing financial difficulties		$ 0	$ 1,869
Commercial and agricultural
Loan modifications to borrowers experiencing financial difficulties
Percent of Total Segment of Financing Receivable	0.01%	0.09%
Weighted Average Interest Rate Reduction		0.00%	0.00%
Weighted Average Term Extension Modification (in months)		3 months	9 months
Weighted Average Payment Delay (in months)		0 months	6 months
Combination Weighted Average Payment Delay and Term Extension (in months)		0 months	35 months
Commercial and agricultural | Combination Payment Delay and Term Extension
Loan modifications to borrowers experiencing financial difficulties
Loan modifications to borrowers experiencing financial difficulties	$ 0	$ 0
Commercial and agricultural | Payment Delay
Loan modifications to borrowers experiencing financial difficulties
Loan modifications to borrowers experiencing financial difficulties	0	0
Commercial and agricultural | Term Extension
Loan modifications to borrowers experiencing financial difficulties
Loan modifications to borrowers experiencing financial difficulties	108	752
Commercial and agricultural | Interest Rate Reduction
Loan modifications to borrowers experiencing financial difficulties
Loan modifications to borrowers experiencing financial difficulties	$ 0	0
Commercial and agricultural | Current
Loan modifications to borrowers experiencing financial difficulties
Loan modifications to borrowers experiencing financial difficulties		752	$ 1,798
Commercial and agricultural | 30 to 59 Days Past Due
Loan modifications to borrowers experiencing financial difficulties
Loan modifications to borrowers experiencing financial difficulties		0	0
Commercial and agricultural | 60 to 89 Days Past Due
Loan modifications to borrowers experiencing financial difficulties
Loan modifications to borrowers experiencing financial difficulties		0	0
Commercial and agricultural | 90 Days or More Past Due
Loan modifications to borrowers experiencing financial difficulties
Loan modifications to borrowers experiencing financial difficulties		0	1,869
Commercial and agricultural | Total Past Due
Loan modifications to borrowers experiencing financial difficulties
Loan modifications to borrowers experiencing financial difficulties		$ 0	$ 1,869
Construction equipment
Loan modifications to borrowers experiencing financial difficulties
Percent of Total Segment of Financing Receivable		0.39%
Weighted Average Interest Rate Reduction		0.00%	0.00%
Weighted Average Term Extension Modification (in months)		5 months	4 months
Weighted Average Payment Delay (in months)		0 months	0 months
Combination Weighted Average Payment Delay and Term Extension (in months)		0 months	0 months
Construction equipment | Combination Payment Delay and Term Extension
Loan modifications to borrowers experiencing financial difficulties
Loan modifications to borrowers experiencing financial difficulties		$ 0
Construction equipment | Payment Delay
Loan modifications to borrowers experiencing financial difficulties
Loan modifications to borrowers experiencing financial difficulties		0
Construction equipment | Term Extension
Loan modifications to borrowers experiencing financial difficulties
Loan modifications to borrowers experiencing financial difficulties		3,912
Construction equipment | Interest Rate Reduction
Loan modifications to borrowers experiencing financial difficulties
Loan modifications to borrowers experiencing financial difficulties		0
Construction equipment | Current
Loan modifications to borrowers experiencing financial difficulties
Loan modifications to borrowers experiencing financial difficulties		3,912	$ 1,372
Construction equipment | 30 to 59 Days Past Due
Loan modifications to borrowers experiencing financial difficulties
Loan modifications to borrowers experiencing financial difficulties		0	0
Construction equipment | 60 to 89 Days Past Due
Loan modifications to borrowers experiencing financial difficulties
Loan modifications to borrowers experiencing financial difficulties		0	0
Construction equipment | 90 Days or More Past Due
Loan modifications to borrowers experiencing financial difficulties
Loan modifications to borrowers experiencing financial difficulties		0	0
Construction equipment | Total Past Due
Loan modifications to borrowers experiencing financial difficulties
Loan modifications to borrowers experiencing financial difficulties		$ 0	$ 0
Commercial real estate
Loan modifications to borrowers experiencing financial difficulties
Percent of Total Segment of Financing Receivable		0.05%
Weighted Average Interest Rate Reduction		3.00%	0.00%
Weighted Average Term Extension Modification (in months)		0 months	0 months
Weighted Average Payment Delay (in months)		0 months	3 months
Combination Weighted Average Payment Delay and Term Extension (in months)		0 months	0 months
Commercial real estate | Combination Payment Delay and Term Extension
Loan modifications to borrowers experiencing financial difficulties
Loan modifications to borrowers experiencing financial difficulties		$ 0
Commercial real estate | Payment Delay
Loan modifications to borrowers experiencing financial difficulties
Loan modifications to borrowers experiencing financial difficulties		0
Commercial real estate | Term Extension
Loan modifications to borrowers experiencing financial difficulties
Loan modifications to borrowers experiencing financial difficulties		0
Commercial real estate | Interest Rate Reduction
Loan modifications to borrowers experiencing financial difficulties
Loan modifications to borrowers experiencing financial difficulties		511
Commercial real estate | Current
Loan modifications to borrowers experiencing financial difficulties
Loan modifications to borrowers experiencing financial difficulties		511	$ 269
Commercial real estate | 30 to 59 Days Past Due
Loan modifications to borrowers experiencing financial difficulties
Loan modifications to borrowers experiencing financial difficulties		0	0
Commercial real estate | 60 to 89 Days Past Due
Loan modifications to borrowers experiencing financial difficulties
Loan modifications to borrowers experiencing financial difficulties		0	0
Commercial real estate | 90 Days or More Past Due
Loan modifications to borrowers experiencing financial difficulties
Loan modifications to borrowers experiencing financial difficulties		0	0
Commercial real estate | Total Past Due
Loan modifications to borrowers experiencing financial difficulties
Loan modifications to borrowers experiencing financial difficulties		$ 0	$ 0
Auto and light truck
Loan modifications to borrowers experiencing financial difficulties
Percent of Total Segment of Financing Receivable	2.56%
Weighted Average Interest Rate Reduction			0.00%
Weighted Average Term Extension Modification (in months)			0 months
Weighted Average Payment Delay (in months)			0 months
Combination Weighted Average Payment Delay and Term Extension (in months)			3 months
Auto and light truck | Combination Payment Delay and Term Extension
Loan modifications to borrowers experiencing financial difficulties
Loan modifications to borrowers experiencing financial difficulties	$ 25,583
Auto and light truck | Payment Delay
Loan modifications to borrowers experiencing financial difficulties
Financing Receivable, Troubled Debt Restructuring, Subsequent Default	0
Auto and light truck | Term Extension
Loan modifications to borrowers experiencing financial difficulties
Financing Receivable, Troubled Debt Restructuring, Subsequent Default	0
Auto and light truck | Interest Rate Reduction
Loan modifications to borrowers experiencing financial difficulties
Financing Receivable, Troubled Debt Restructuring, Subsequent Default	$ 0
Auto and light truck | Current
Loan modifications to borrowers experiencing financial difficulties
Loan modifications to borrowers experiencing financial difficulties			$ 25,583
Auto and light truck | 30 to 59 Days Past Due
Loan modifications to borrowers experiencing financial difficulties
Loan modifications to borrowers experiencing financial difficulties			0
Auto and light truck | 60 to 89 Days Past Due
Loan modifications to borrowers experiencing financial difficulties
Loan modifications to borrowers experiencing financial difficulties			0
Auto and light truck | 90 Days or More Past Due
Loan modifications to borrowers experiencing financial difficulties
Loan modifications to borrowers experiencing financial difficulties			0
Auto and light truck | Total Past Due
Loan modifications to borrowers experiencing financial difficulties
Loan modifications to borrowers experiencing financial difficulties			$ 0
Medium and heavy duty truck
Loan modifications to borrowers experiencing financial difficulties
Weighted Average Interest Rate Reduction			0.00%
Weighted Average Term Extension Modification (in months)			0 months
Weighted Average Payment Delay (in months)			0 months
Combination Weighted Average Payment Delay and Term Extension (in months)			6 months
Medium and heavy duty truck | Current
Loan modifications to borrowers experiencing financial difficulties
Loan modifications to borrowers experiencing financial difficulties			$ 10,699
Medium and heavy duty truck | 30 to 59 Days Past Due
Loan modifications to borrowers experiencing financial difficulties
Loan modifications to borrowers experiencing financial difficulties			0
Medium and heavy duty truck | 60 to 89 Days Past Due
Loan modifications to borrowers experiencing financial difficulties
Loan modifications to borrowers experiencing financial difficulties			0
Medium and heavy duty truck | 90 Days or More Past Due
Loan modifications to borrowers experiencing financial difficulties
Loan modifications to borrowers experiencing financial difficulties			0
Medium and heavy duty truck | Total Past Due
Loan modifications to borrowers experiencing financial difficulties
Loan modifications to borrowers experiencing financial difficulties			$ 0