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Note 4 - Loans (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Financing Receivable, after Allowance for Credit Loss | $ 19,203,649 | $ 19,382,858 |
Servicing Asset | 172,200 | 203,000 |
Financing Receivable, Nonaccrual | 169,161 | 66,681 |
Financing Receivable, Nonaccrual, Average Recorded Investment | 130,126 | 71,830 |
Financing Receivable, Nonaccrual, Interest Income | $ 197 | $ 321 | $ 435
Percentage Of Charge Off To Contractual Balances For Impaired Loans | 11.70% | 15.80% |
Financing Receivables, Impaired, Troubled Debt Restructuring, Specific Reserve |  |  | 427
Financing Receivable, Modified, Subsequent Default | $ 0 | $ 0 |
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend | $ 0 |  |
Minimum [Member] |  |  |
Period Loan Is In Payment Default (Day) | 60 days |  |
Maximum [Member] |  |  |
Period Loan Is In Payment Default (Day) | 90 days |  |
Accruing Troubled Debt Restructuring [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring |  |  | 15,100
Financing Receivables, Impaired, Troubled Debt Restructuring, Specific Reserve |  |  | 0
Non-accruing Troubled Debt Restructuring [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring |  |  | 6,300
Financing Receivables, Impaired, Troubled Debt Restructuring, Specific Reserve |  |  | 427
Real Estate [Member] |  |  |
Financing Receivable, Nonaccrual | $ 115,200 | 52,300 |
Residential Portfolio Segment [Member] |  |  |
Servicing Asset | 63,300 | 70,700 |
Repossessed Assets | 6,700 | 242 |
Commercial Real Estate Portfolio Segment [Member] |  |  |
Servicing Asset | 44,500 | 76,100 |
Financing Receivable, Nonaccrual, Average Recorded Investment | 66,634 | 35,742 |
Financing Receivable, Nonaccrual, Interest Income | 196 | 318 |
Financing Receivables, Impaired, Troubled Debt Restructuring, Specific Reserve |  |  | 0
Commercial Construction Loans [Member] |  |  |
Servicing Asset | 22,600 | 11,800 |
Commercial Portfolio Segment [Member] |  |  |
Servicing Asset | 41,800 | 44,400 |
Financing Receivable, Nonaccrual, Average Recorded Investment | 27,236 | 18,008 |
Financing Receivable, Nonaccrual, Interest Income | 1 | 3 |
Financing Receivables, Impaired, Troubled Debt Restructuring, Specific Reserve |  |  | $ 427
Real Estate Loan [Member] | Asset Pledged as Collateral [Member] | Federal Home Loan Bank Advances [Member] |  |  |
Financing Receivable, after Allowance for Credit Loss | 14,550,000 | 14,150,000 |
Commercial Loans [Member] | Asset Pledged as Collateral [Member] | Federal Reserve Bank’s Discount Window [Member] |  |  |
Financing Receivable, after Allowance for Credit Loss | $ 474,800 | $ 388 |

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