Note 5 - Investment Securities - Schedule of Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value (Details) $ in Thousands	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions	141	129
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (1,715)	$ (3)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months	116,800	532
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(96,807)	(98,020)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer	440,830	485,527
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss	(98,522)	(98,023)
Debt Securities, Available-for-Sale, Unrealized Loss Position	$ 557,630	$ 486,059
US Treasury 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	$ (3)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months	0	489
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(2)	0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer	327	0
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss	(2)	(3)
Debt Securities, Available-for-Sale, Unrealized Loss Position	$ 327	$ 489
Residential Mortgage-Backed Securities [Member]
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions	124	112
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (1,715)	$ 0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months	116,800	43
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(91,090)	(88,547)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer	386,864	435,505
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss	(92,805)	(88,547)
Debt Securities, Available-for-Sale, Unrealized Loss Position	$ 503,664	$ 435,548
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	(99)	(123)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer	1,251	1,353
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss	(99)	(123)
Debt Securities, Available-for-Sale, Unrealized Loss Position	$ 1,251	$ 1,353
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	(1)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer	18	25
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss	0	(1)
Debt Securities, Available-for-Sale, Unrealized Loss Position	$ 18	$ 25
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	(5,616)	(9,349)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer	52,370	48,644
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss	(5,616)	(9,349)
Debt Securities, Available-for-Sale, Unrealized Loss Position	$ 52,370	$ 48,644

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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