Note 5 - DERIVATIVES AND HEDGING ACTIVITIES - Cash flow hedging and fair value (Details) - Non Designated - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 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	$ 79,267	$ 51,667	$ 198,534	$ 148,135
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	18,498	5,438	32,632	16,415
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	(259)	181	202	495
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	(426)		715	502
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	$ 73	$ 285	$ 536	$ 830