Note 3 - Investment Securities Available for Sale (Details Textual)	9 Months Ended	12 Months Ended
Sep. 30, 2026 USD ($)	Sep. 30, 2025 USD ($)	Dec. 31, 2025 USD ($)
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain (Loss), before Tax	$ 44,372,000		$ 14,895,000
Available-for-sale Securities Income Tax Expense (Benefit) on Accumulated Gross Unrealized Gains Losses	$ 13,116,000		$ 4,404,000
Number of Securities Sold During Period	0	90	135
Proceeds from Sale of Debt Securities, Available-for-Sale	$ 0	$ 88,009,000	$ 130,635,000
Debt Securities, Available-for-Sale, Realized Gain (Loss)		(625,000)	(6,065,000)
Gain (Loss) on Fair Value Hedges Recognized in Earnings		$ 254,000	$ 254,000
Number of Securities Sold for Gain During the Period		15	15
Debt Securities, Available-for-Sale, Realized Gain		$ 36,000	$ 36,000
Number of Securities Sold for Loss During the Period		75	120
Debt Securities, Available-for-Sale, Realized Loss		$ 661,000	$ 6,101,000
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss	$ 0		0
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions	308
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	196
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	105
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss	$ 519,540,000		491,490,000
Debt Securities, Available-for-Sale, Excluding Accrued Interest	475,168,000		476,595,000
Federal Reserve Bank Advances [Member] \| Federal Reserve Bank Discount Window Program [Member]
Short-Term Debt	0		0
Asset Pledged as Collateral [Member] \| Deposits and Repurchase Agreements [Member]
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss	439,348,000		400,458,000
Debt Securities, Available-for-Sale, Excluding Accrued Interest	$ 402,325,000		388,357,000
Residential Mortgage Backed Securities Issued by US Government Sponsored Enterprises [Member]
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions	99
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss	$ 264,595,000		257,520,000
Debt Securities, Available-for-Sale, Excluding Accrued Interest	$ 246,652,000		253,165,000
Commercial Mortgage Backed Securities Issued by US Government Agencies [Member]
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions	54
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss	$ 163,072,000		141,861,000
Debt Securities, Available-for-Sale, Excluding Accrued Interest	$ 147,207,000		134,764,000
US States and Political Subdivisions Debt Securities [Member]
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions	155
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss	$ 91,873,000		92,109,000
Debt Securities, Available-for-Sale, Excluding Accrued Interest	$ 81,309,000		$ 88,666,000

This item represents the tax expense (benefit) occurring during the period which are related to the gross unrealized gain (loss) resulting from changes in the fair [carrying] value during the period of available-for-sale securities. Such tax effects would have been charged or credited directly to accumulated other comprehensive income or to related components of shareholders' equity.

No definition available.