Note 9 - Derivative Financial Instruments - Interest Rate Swaps (Details) - Not Designated as Hedging Instrument [Member] - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Forward Contracts [Member]
Derivatives notional amount	$ 369.8	$ 296.0
Forward Contracts [Member] | Other Assets [Member]
Derivatives Assets, fair value	0.2	1.9
Forward Contracts [Member] | Other Liabilities [Member]
Derivatives liabilities, fair value	0.8	3.6
Interest Rate Lock Commitments [Member]
Derivatives notional amount	274.5	203.1
Interest Rate Lock Commitments [Member] | Other Assets [Member]
Derivatives Assets, fair value	1.1	0.7
Interest Rate Lock Commitments [Member] | Other Liabilities [Member]
Derivatives liabilities, fair value	0.4	0.0
Interest Rate Swaption [Member]
Derivatives notional amount	90.0	90.5
Interest Rate Swaption [Member] | Other Assets [Member]
Derivatives Assets, fair value	12.3	14.2
Interest Rate Swaption [Member] | Other Liabilities [Member]
Derivatives liabilities, fair value	$ 12.3	$ 14.2