Note 3 - Investment Securities - Schedule of Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value (Details) - USD ($)	Jun. 30, 2026	Dec. 31, 2025
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 249,414,000	$ 57,763,000
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(3,148,000)	(138,000)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer	255,399,000	301,152,000
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(26,065,000)	(25,276,000)
Debt Securities, Available-for-Sale, Unrealized Loss Position	504,813,000	358,915,000
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss	(29,213,000)	(25,414,000)
US Treasury Securities [Member]
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months	46,465,000	7,664,000
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(390,000)	(7,000)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer	20,940,000	25,834,000
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(428,000)	(435,000)
Debt Securities, Available-for-Sale, Unrealized Loss Position	67,405,000	33,498,000
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss	(818,000)	(442,000)
US Government Corporations and Agencies Securities [Member]
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months	27,817,000	14,168,000
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(430,000)	(46,000)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer	39,369,000	41,820,000
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(1,792,000)	(1,903,000)
Debt Securities, Available-for-Sale, Unrealized Loss Position	67,186,000	55,988,000
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss	(2,222,000)	(1,949,000)
US States and Political Subdivisions Debt Securities [Member]
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months	16,859,000	1,144,000
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(182,000)	(1,000)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer	35,461,000	47,845,000
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(2,931,000)	(3,240,000)
Debt Securities, Available-for-Sale, Unrealized Loss Position	52,320,000	48,989,000
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss	(3,113,000)	(3,241,000)
Collateralized Mortgage Obligations [Member]
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months	33,380,000	13,402,000
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(501,000)	(51,000)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer	52,532,000	58,408,000
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(12,067,000)	(11,184,000)
Debt Securities, Available-for-Sale, Unrealized Loss Position	85,912,000	71,810,000
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss	(12,568,000)	(11,235,000)
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member]
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months	124,893,000	21,385,000
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(1,645,000)	(33,000)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer	107,097,000	127,245,000
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(8,847,000)	(8,514,000)
Debt Securities, Available-for-Sale, Unrealized Loss Position	231,990,000	148,630,000
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss	$ (10,492,000)	$ (8,547,000)

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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