Note 8 - Fair Value Measurements and Fair Value of Financial Instruments - Assets and Liabilities Measured on a Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2026	Dec. 31, 2025
Securities available-for-sale, fair value	$ 1,323,789	$ 1,250,938
Fair Value, Recurring [Member]
Securities available-for-sale, fair value	1,323,789	1,250,938
Equity securities	21,947	19,287
Derivatives	21,806	16,074
Total assets	1,367,542	1,286,299
Derivatives - interest rate contracts	2,052	704
Total liabilities	2,052	704
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Securities available-for-sale, fair value	1,504	182
Equity securities	9,553	10,073
Derivatives	0	0
Total assets	11,057	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	1,322,285	1,244,244
Equity securities	12,394	9,214
Derivatives	21,806	16,074
Total assets	1,356,485	1,269,532
Derivatives - interest rate contracts	2,052	704
Total liabilities	2,052	704
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Securities available-for-sale, fair value	0	6,512
Equity securities	0	0
Derivatives	0	0
Total assets	0	6,512
Derivatives - interest rate contracts	0	0
Total liabilities	0	0
US Government Agencies Debt Securities [Member]
Securities available-for-sale, fair value	303,837	391,190
US Government Agencies Debt Securities [Member] \| Fair Value, Recurring [Member]
Securities available-for-sale, fair value	303,837	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	303,837	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	784,661	607,144
Residential Mortgage-Backed Securities [Member] \| Fair Value, Recurring [Member]
Securities available-for-sale, fair value	784,661	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	784,661	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	29,379	26,969
Commercial Mortgage-Backed Securities [Member] \| Fair Value, Recurring [Member]
Securities available-for-sale, fair value	29,379	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	29,379	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	178,296	212,409
US States and Political Subdivisions Debt Securities [Member] \| Fair Value, Recurring [Member]
Securities available-for-sale, fair value	178,296	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	178,296	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	0	6,512
Corporate Debt Securities [Member]
Securities available-for-sale, fair value	25,634	12,519
Corporate Debt Securities [Member] \| Fair Value, Recurring [Member]
Securities available-for-sale, fair value	25,634	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	25,634	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	478	525
Asset-Backed Securities [Member] \| Fair Value, Recurring [Member]
Securities available-for-sale, fair value	478	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	478	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	1,504	182
Other Debt Obligations [Member] \| Fair Value, Recurring [Member]
Securities available-for-sale, fair value	1,504	182
Other Debt Obligations [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Securities available-for-sale, fair value	1,504	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 of financial and nonfinancial obligations.

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