Note 3 - Investment Securities - Schedule of Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value (Details) $ in Thousands	Mar. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions	135	141
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (263)	$ (1,715)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months	56,387	116,800
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(84,050)	(96,807)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer	442,867	440,830
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss	(84,313)	(98,522)
Debt Securities, Available-for-Sale, Unrealized Loss Position	$ 499,254	$ 557,630
US Treasury Securities [Member]
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions	2	1
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (1)	$ 0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months	351	0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(1)	(2)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer	308	327
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss	(2)	(2)
Debt Securities, Available-for-Sale, Unrealized Loss Position	$ 659	$ 327
Residential Mortgage-Backed Securities [Member]
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions	117	124
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (262)	$ (1,715)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months	56,036	116,800
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(80,056)	(91,090)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer	387,207	386,864
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss	(80,318)	(92,805)
Debt Securities, Available-for-Sale, Unrealized Loss Position	$ 443,243	$ 503,664
Commercial Mortgage-Backed Securities [Member]
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions	1	1
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 0	$ 0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months	0	0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(69)	(99)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer	1,274	1,251
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss	(69)	(99)
Debt Securities, Available-for-Sale, Unrealized Loss Position	$ 1,274	$ 1,251
Asset-Backed Securities [Member]
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions	3	3
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 0	$ 0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months	0	0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer	18	18
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss	0	0
Debt Securities, Available-for-Sale, Unrealized Loss Position	$ 18	$ 18
Corporate Bond Securities [Member]
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions	12	12
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 0	$ 0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months	0	0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(3,924)	(5,616)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer	54,060	52,370
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss	(3,924)	(5,616)
Debt Securities, Available-for-Sale, Unrealized Loss Position	$ 54,060	$ 52,370

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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