Note 21 - Fair Value (Details) $ in Thousands	Nov. 16, 2023 USD ($)	Oct. 12, 2023 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Securities available for sale, at fair value			$ 299,655	$ 340,960
Derivatives			187,341	177,631
Derivatives			215,735	200,701
Trading securities			22,369
Fair Value, Measurements, Recurring
Derivatives			187,341	177,631
Assets Fair Value			509,365	518,591
Liabilities Fair Value			$ 215,735	200,701
Fair Value, Measurements, Recurring | Discount Rate | Minimum
Measurement Input			5.52
Fair Value, Measurements, Recurring | Discount Rate | Maximum
Measurement Input			7.56
Fair Value, Measurements, Recurring | Interest rate swaps
Derivatives			$ 215,735	200,701
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Derivatives			187,341	177,631
Assets Fair Value			486,996	518,591
Liabilities Fair Value			215,735	200,701
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Interest rate swaps
Derivatives			215,735	200,701
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3
Assets Fair Value			22,369
Fair Value, Measurements, Nonrecurring
Assets Fair Value			35,111	30,909
Fair Value, Measurements, Nonrecurring | Fair Value, Inputs, Level 3
Assets Fair Value			35,111	30,909
U.S. treasuries and govt. sponsored agency securities
Securities available for sale, at fair value			14,973	16,981
U.S. treasuries and govt. sponsored agency securities | Fair Value, Measurements, Recurring
Securities available for sale, at fair value			14,973	16,981
U.S. treasuries and govt. sponsored agency securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Securities available for sale, at fair value			14,973	16,981
Residential mortgage-backed and related securities
Securities available for sale, at fair value			59,196	66,215
Residential mortgage-backed and related securities | Fair Value, Measurements, Recurring
Securities available for sale, at fair value			59,196	66,215
Residential mortgage-backed and related securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Securities available for sale, at fair value			59,196	66,215
Municipal securities.
Securities available for sale, at fair value			170,987	193,178
Municipal securities. | Fair Value, Measurements, Recurring
Securities available for sale, at fair value			170,987	193,178
Municipal securities. | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Securities available for sale, at fair value			170,987	193,178
Asset-backed securities
Securities available for sale, at fair value			15,423	18,728
Asset-backed securities | Fair Value, Measurements, Recurring
Securities available for sale, at fair value			15,423	18,728
Asset-backed securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Securities available for sale, at fair value			15,423	18,728
Other securities
Securities available for sale, at fair value			39,076	45,858
Other securities | Fair Value, Measurements, Recurring
Securities available for sale, at fair value			39,076	45,858
Other securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Securities available for sale, at fair value			39,076	45,858
Securities trading | Fair Value, Measurements, Recurring
Securities available for sale, at fair value			22,369
Securities trading | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3
Securities available for sale, at fair value			22,369
M-series Tax exempt LIHTC loans
Trading securities		$ 16,200
Recognized trading gain (loss)		$ 2,400
Q-series Tax exempt LIHTC loans
Trading securities	$ 6,200
Recognized trading gain (loss)	$ 3,100
Impaired Loans Leases | Fair Value, Measurements, Nonrecurring
Assets Fair Value			33,656	30,765
Impaired Loans Leases | Fair Value, Measurements, Nonrecurring | Fair Value, Inputs, Level 3
Assets Fair Value			33,656	30,765
Other Real Estate Owned | Fair Value, Measurements, Nonrecurring
Assets Fair Value			1,455	144
Other Real Estate Owned | Fair Value, Measurements, Nonrecurring | Fair Value, Inputs, Level 3
Assets Fair Value			$ 1,455	$ 144