Note 4 - DERIVATIVES AND HEDGING ACTIVITIES - Cash flow hedging and fair value (Details) - Non Designated - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Interest And Dividend Income
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract]
Income and expense line items presented in the consolidated statements of income	$ 51,062	$ 47,565
Interest Expense
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract]
Income and expense line items presented in the consolidated statements of income	5,329	5,590
Interest Rate Caps On Deposits | Interest Expense
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract]
Gain Loss From Components Excluded From Assessment Of Cash Flow Hedge Effectiveness Net	221	151
Interest Rate Swaps on Variable Rate Loans | Interest And Dividend Income
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract]
Gain Loss From Components Excluded From Assessment Of Cash Flow Hedge Effectiveness Net	471
Interest Rate Swap on Junior Subordinated Debentures | Interest Expense
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract]
Gain Loss From Components Excluded From Assessment Of Cash Flow Hedge Effectiveness Net	$ 267	$ 269