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Note 15 - Financial Derivatives (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
May 31, 2014
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Junior Subordinated Notes, Total $ 119,100        
Loans Receivable with Partial-term Hedging Designation [Member]          
Derivative, Notional Amount     $ 21,100    
Hedged Asset, Fair Value Hedge     768,100    
Loan, Notational Amount     1,300,000    
Hedged Asset, Fair Value Hedge, Portfolio Layer Method, Hedged Layer, Fair Value, Cumulative Increase (Decrease)     19,900    
Interest Rate Swap [Member] | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member]          
Derivative Outstanding, Notional Amount $ 119,100   642,100   $ 595,400
Derivative, Notional Amount     56,000   50,000
Derivative Original Maturity (Year) 10 years        
Deferred Gain on Early Termination of Derivative         4,000
Derivative, Gain on Derivative   $ 138   $ 1,300  
Interest Rate Swap [Member] | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Central Counterparties (CCP) [Member]          
Derivative, Notional Amount         $ 205,600
Interest Rate Swap [Member] | Fair Value Hedging [Member] | Designated as Hedging Instrument [Member]          
Derivative, Notional Amount   $ 874,034 $ 857,341 $ 874,034  
Interest Rate Swap [Member] | Fair Value Hedging [Member] | Designated as Hedging Instrument [Member] | Minimum [Member]          
Derivative, Term of Contract (Year)     3 years    
Interest Rate Swap [Member] | Fair Value Hedging [Member] | Designated as Hedging Instrument [Member] | Maximum [Member]          
Derivative, Term of Contract (Year)     10 years    
Interest Rate Swap [Member] | Fair Value Hedging [Member] | Designated as Hedging Instrument [Member] | Central Counterparties (CCP) [Member]          
Derivative, Notional Amount     $ 547,500    
Derivative, Gain on Derivative     13,900    
Interest Rate Contract [Member] | Fair Value Hedging [Member] | Designated as Hedging Instrument [Member]          
Derivative Outstanding, Notional Amount     89,300    
Derivative, Notional Amount     $ 6,300