Note 7 - Fair Value Measurements and Fair Value of Financial Instruments - Assets and Liabilities Measured on a Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Securities available-for-sale, fair value	$ 1,196,384	$ 1,250,938
Fair Value, Recurring [Member]
Securities available-for-sale, fair value	1,196,384	1,250,938
Equity securities	19,422	19,287
Derivatives	17,165	16,074
Total assets	1,232,971	1,286,299
Derivatives - interest rate contracts	372	704
Total liabilities	372	704
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Securities available-for-sale, fair value	260	182
Equity securities	10,010	10,073
Derivatives	0	0
Total assets	10,270	10,255
Derivatives - interest rate contracts	0	0
Total liabilities	0	0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Securities available-for-sale, fair value	1,189,746	1,244,244
Equity securities	9,412	9,214
Derivatives	17,165	16,074
Total assets	1,216,323	1,269,532
Derivatives - interest rate contracts	372	704
Total liabilities	372	704
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Securities available-for-sale, fair value	6,378	6,512
Equity securities	0	0
Derivatives	0	0
Total assets	6,378	6,512
Derivatives - interest rate contracts	0	0
Total liabilities	0	0
US Government Agencies Debt Securities [Member]
Securities available-for-sale, fair value	354,803	391,190
US Government Agencies Debt Securities [Member] \| Fair Value, Recurring [Member]
Securities available-for-sale, fair value	354,803	391,190
US Government Agencies Debt Securities [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Securities available-for-sale, fair value	0	0
US Government Agencies Debt Securities [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Securities available-for-sale, fair value	354,803	391,190
US Government Agencies Debt Securities [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Securities available-for-sale, fair value	0	0
Residential Mortgage-Backed Securities [Member]
Securities available-for-sale, fair value	596,158	607,144
Residential Mortgage-Backed Securities [Member] \| Fair Value, Recurring [Member]
Securities available-for-sale, fair value	596,158	607,144
Residential Mortgage-Backed Securities [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Securities available-for-sale, fair value	0	0
Residential Mortgage-Backed Securities [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Securities available-for-sale, fair value	596,158	607,144
Residential Mortgage-Backed Securities [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Securities available-for-sale, fair value	0	0
Commercial Mortgage-Backed Securities [Member]
Securities available-for-sale, fair value	26,628	26,969
Commercial Mortgage-Backed Securities [Member] \| Fair Value, Recurring [Member]
Securities available-for-sale, fair value	26,628	26,969
Commercial Mortgage-Backed Securities [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Securities available-for-sale, fair value	0	0
Commercial Mortgage-Backed Securities [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Securities available-for-sale, fair value	26,628	26,969
Commercial Mortgage-Backed Securities [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Securities available-for-sale, fair value	0	0
US States and Political Subdivisions Debt Securities [Member]
Securities available-for-sale, fair value	204,563	212,409
US States and Political Subdivisions Debt Securities [Member] \| Fair Value, Recurring [Member]
Securities available-for-sale, fair value	204,563	212,409
US States and Political Subdivisions Debt Securities [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Securities available-for-sale, fair value	0	0
US States and Political Subdivisions Debt Securities [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Securities available-for-sale, fair value	198,185	205,897
US States and Political Subdivisions Debt Securities [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Securities available-for-sale, fair value	6,378	6,512
Corporate Debt Securities [Member]
Securities available-for-sale, fair value	13,466	12,519
Corporate Debt Securities [Member] \| Fair Value, Recurring [Member]
Securities available-for-sale, fair value	13,466	12,519
Corporate Debt Securities [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Securities available-for-sale, fair value	0	0
Corporate Debt Securities [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Securities available-for-sale, fair value	13,466	12,519
Corporate Debt Securities [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Securities available-for-sale, fair value	0	0
Asset-Backed Securities [Member]
Securities available-for-sale, fair value	506	525
Asset-Backed Securities [Member] \| Fair Value, Recurring [Member]
Securities available-for-sale, fair value	506	525
Asset-Backed Securities [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Securities available-for-sale, fair value	0	0
Asset-Backed Securities [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Securities available-for-sale, fair value	506	525
Asset-Backed Securities [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Securities available-for-sale, fair value	0	0
Other Debt Obligations [Member]
Securities available-for-sale, fair value	260	182
Other Debt Obligations [Member] \| Fair Value, Recurring [Member]
Securities available-for-sale, fair value	260	182
Other Debt Obligations [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Securities available-for-sale, fair value	260	182
Other Debt Obligations [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Securities available-for-sale, fair value	0	0
Other Debt Obligations [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Securities available-for-sale, fair value	$ 0	$ 0

Fair value portion of asset recognized for present right to economic benefit.

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Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Fair value as of the balance sheet date of interest rate derivative assets, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as assets.

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Fair value as of the balance sheet date of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as liabilities.

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Fair value of financial and nonfinancial obligations.

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