Note 3 - Investment Securities - Schedule of Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value (Details) $ in Thousands	Jun. 30, 2025 USD ($)	Dec. 31, 2024 USD ($)
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions	128	141
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (1)	$ (1,715)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months	35	116,800
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(79,976)	(96,807)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer	435,063	440,830
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss	(79,977)	(98,522)
Debt Securities, Available-for-Sale, Unrealized Loss Position	$ 435,098	$ 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	$ 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	(1)	(2)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer	469	327
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss	(1)	(2)
Debt Securities, Available-for-Sale, Unrealized Loss Position	$ 469	$ 327
Residential Mortgage-Backed Securities [Member]
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions	111	124
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (1)	$ (1,715)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months	35	116,800
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(76,216)	(91,090)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer	383,021	386,864
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss	(76,217)	(92,805)
Debt Securities, Available-for-Sale, Unrealized Loss Position	$ 383,056	$ 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	(56)	(99)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer	1,278	1,251
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss	(56)	(99)
Debt Securities, Available-for-Sale, Unrealized Loss Position	$ 1,278	$ 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	16	18
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss	0	0
Debt Securities, Available-for-Sale, Unrealized Loss Position	$ 16	$ 18
Corporate Bond Securities [Member]
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions	11	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	(3,703)	(5,616)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer	50,279	52,370
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss	(3,703)	(5,616)
Debt Securities, Available-for-Sale, Unrealized Loss Position	$ 50,279	$ 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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