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Note 6 - Loans and the Allowance for Credit Losses - Amortized Cost of of the Modified Loans (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2025
Modified | $ 126 | $ 83,190
Loans Modified, Gross | $ 7,656,658 | $ 7,587,146
Modified, percentage | 0.00% | 1.10%
Weighted Average Term Extension (Month) |  | 142 months
Weighted Average Payment Reduction |  | $ 6
Weighted Average Interest Rate Reduction |  | 0.10%
Extended Maturity [Member] |  |
Modified | $ 0 | $ 19,053
Payment Deferral [Member] |  |
Modified | 126 | 0
Contractual Interest Rate Reduction [Member] |  |
Modified | 0 | 63,804
Principal Forgiveness [Member] |  |
Modified | 0 | 333
Commercial Portfolio Segment [Member] |  |
Modified | 126 | 17,974
Loans Modified, Gross | $ 1,572,494 | $ 1,492,920
Modified, percentage | 0.01% | 1.20%
Weighted Average Term Extension (Month) |  | 6 months
Weighted Average Payment Reduction |  | $ 6
Commercial Portfolio Segment [Member] | Weighted Average [Member] |  |
Payment Deferral (Month) | 3 months |
Commercial Portfolio Segment [Member] | Extended Maturity [Member] |  |
Modified | $ 0 | 17,641
Commercial Portfolio Segment [Member] | Payment Deferral [Member] |  |
Modified | 126 | 0
Commercial Portfolio Segment [Member] | Contractual Interest Rate Reduction [Member] |  |
Modified | 0 | 0
Commercial Portfolio Segment [Member] | Principal Forgiveness [Member] |  |
Modified | 0 | 333
Commercial Real Estate Portfolio Segment [Member] |  |
Modified | 0 | 63,804
Loans Modified, Gross | $ 5,829,950 | $ 5,837,671
Modified, percentage | 0.00% | 1.09%
Weighted Average Interest Rate Reduction |  | 0.10%
Commercial Real Estate Portfolio Segment [Member] | Extended Maturity [Member] |  |
Modified | $ 0 | $ 0
Commercial Real Estate Portfolio Segment [Member] | Payment Deferral [Member] |  |
Modified | 0 | 0
Commercial Real Estate Portfolio Segment [Member] | Contractual Interest Rate Reduction [Member] |  |
Modified | 0 | 63,804
Commercial Real Estate Portfolio Segment [Member] | Principal Forgiveness [Member] |  |
Modified | 0 | 0
Residential Portfolio Segment [Member] |  |
Modified | 0 | 1,412
Loans Modified, Gross | $ 254,214 | $ 256,555
Modified, percentage | 0.00% | 0.55%
Weighted Average Term Extension (Month) |  | 136 months
Weighted Average Payment Reduction |  | $ 0
Residential Portfolio Segment [Member] | Extended Maturity [Member] |  |
Modified | $ 0 | 1,412
Residential Portfolio Segment [Member] | Payment Deferral [Member] |  |
Modified | 0 | 0
Residential Portfolio Segment [Member] | Contractual Interest Rate Reduction [Member] |  |
Modified | 0 | 0
Residential Portfolio Segment [Member] | Principal Forgiveness [Member] |  |
Modified | $ 0 | $ 0

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