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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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