Note 4 - Investment Securities (Details Textual)	12 Months Ended
Dec. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain (Loss), before Tax	$ 14,895,000	$ 35,698,000	$ 46,088,000
Available-for-sale Securities Income Tax Expense (Benefit) on Accumulated Gross Unrealized Gains Losses	$ 4,404,000	$ 10,552,000	$ 13,624,000
Number of Securities Sold During Period	135	157	0
Proceeds from Sale of Debt Securities, Available-for-Sale	$ 130,635,000	$ 116,285,000	$ 0
Debt Securities, Available-for-Sale, Realized Gain (Loss)	(6,065,000)	$ (19,817,000)
Gain (Loss) on Fair Value Hedges Recognized in Earnings	$ 254,000
Number of Securities Sold for Gain During the Period	15	10
Debt Securities, Available-for-Sale, Realized Gain	$ 36,000	$ 115,000
Number of Securities Sold for Loss During the Period	120	147
Debt Securities, Available-for-Sale, Realized Loss	$ 6,101,000	$ 19,932,000
Number of Investment Securities	295
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	12
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	123
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions	135
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss	$ 491,490,000	473,433,000
Debt Securities, Available-for-Sale, Excluding Accrued Interest	476,595,000	437,735,000
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss	0	0
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	354,819,000	225,313,000
Debt Securities, Available-for-Sale, Excluding Accrued Interest	347,675,000	212,001,000
Asset Pledged as Collateral [Member] \| Federal Reserve Bank Discount Window [Member]
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss	45,639,000	131,876,000
Debt Securities, Available-for-Sale, Excluding Accrued Interest	$ 40,682,000	120,060,000
Residential Mortgage Backed Securities Issued by US Government Sponsored Enterprises [Member]
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions	42
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss	$ 257,520,000	243,709,000
Debt Securities, Available-for-Sale, Excluding Accrued Interest	$ 253,165,000	228,391,000
Commercial Mortgage Backed Securities Issued by US Government Agencies [Member]
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions	24
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss	$ 141,861,000	133,749,000
Debt Securities, Available-for-Sale, Excluding Accrued Interest	$ 134,764,000	121,870,000
US States and Political Subdivisions Debt Securities [Member]
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions	69
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss	$ 92,109,000	95,975,000
Debt Securities, Available-for-Sale, Excluding Accrued Interest	$ 88,666,000	$ 87,474,000

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.