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Note 6 - Loans and the Allowance for Credit Losses (Details Textual) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)
Financing Receivable, after Allowance for Credit Loss	$ 8,029,482		$ 8,029,482		$ 8,263,171
Financing Receivable, Held-for-Sale	0		0		0
Financing Receivable, 90 Days or More Past Due, Still Accruing	$ 3,200		$ 3,200
Financing Receivable, Loan-to-value Percentage	65.00%		65.00%
Financing Receivable, Modified in Period, Amount	$ 70,295	$ 211	$ 82,988	$ 255
Financing Receivable, Modified, Commitment to Lend	0	0	$ 0	$ 0
Financing Receivable, Modified, Subsequent Default, Number of Contracts			0	0
Extended Maturity [Member]
Financing Receivable, Modified, Weighted Average Term Increase from Modification (Month)				13 years
Financing Receivable, Modified in Period, Amount	6,491	211	$ 19,058	$ 255
Payment Deferral [Member]
Financing Receivable, Modified in Period, Amount	0	0	126	0
Contractual Interest Rate Reduction [Member]
Financing Receivable, Modified in Period, Amount	63,804	0	$ 63,804	0
Commercial Portfolio Segment [Member]
Financing Receivable, Trouble Debt Restructuring, Number of Contracts			3
Financing Receivable, Modified in Period, Amount	6,491	0	$ 17,767	44
Commercial Portfolio Segment [Member] | Extended Maturity [Member]
Financing Receivable, Trouble Debt Restructuring, Number of Contracts			2
Financing Receivable, Modified, Weighted Average Term Increase from Modification (Month)			6 months
Financing Receivable, Modified in Period, Amount	$ 6,491	0	$ 17,641	44
Commercial Portfolio Segment [Member] | Payment Deferral [Member]
Financing Receivable, Trouble Debt Restructuring, Number of Contracts			1
Financing Receivable, Modified, Payment Deferral, Period (Month)	3 months		3 months
Financing Receivable, Modified in Period, Amount	$ 0	0	$ 126	0
Commercial Portfolio Segment [Member] | Contractual Interest Rate Reduction [Member]
Financing Receivable, Modified in Period, Amount	0	0	$ 0	0
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Trouble Debt Restructuring, Number of Contracts			9
Financing Receivable, Modified in Period, Amount	63,804	211	$ 63,804	211
Commercial Real Estate Portfolio Segment [Member] | Extended Maturity [Member]
Financing Receivable, Modified in Period, Amount	0	211	0	211
Commercial Real Estate Portfolio Segment [Member] | Payment Deferral [Member]
Financing Receivable, Modified in Period, Amount	0		$ 0	0
Commercial Real Estate Portfolio Segment [Member] | Contractual Interest Rate Reduction [Member]
Financing Receivable, Trouble Debt Restructuring, Number of Contracts			9
Financing Receivable, Modified, Weighted Average Interest Rate Decrease from Modification			0.15%
Financing Receivable, Modified in Period, Amount	63,804		$ 63,804	$ 0
Residential Portfolio Segment [Member]
Financing Receivable, Trouble Debt Restructuring, Number of Contracts			1
Financing Receivable, Modified in Period, Amount			$ 1,417
Residential Portfolio Segment [Member] | Extended Maturity [Member]
Financing Receivable, Modified in Period, Amount			1,417
Residential Portfolio Segment [Member] | Payment Deferral [Member]
Financing Receivable, Modified in Period, Amount			0
Residential Portfolio Segment [Member] | Contractual Interest Rate Reduction [Member]
Financing Receivable, Modified in Period, Amount			$ 0
Residential Portfolio Segment [Member] | Freezing of a Loan Commitment, Combined With a Ten-year Term Extension [Member]
Financing Receivable, Modified, Weighted Average Term Increase from Modification (Month)			10 years
Financing Receivable, Modified in Period, Amount			$ 1,400
Asset Pledged as Collateral [Member] | Federal Home Loan Bank Advances [Member]
Financing Receivable, after Allowance for Credit Loss	$ 5,900,000		$ 5,900,000		$ 5,800,000

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