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Note 5 - Deposits - Summary of Deposits (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Noninterest-bearing $ 1,182,775 $ 1,264,523
Noninterest-bearing demand, percentage 24.60% 26.90%
Noninterest-bearing demand, percent increase (decrease) (6.50%)  
Interest-bearing checking $ 761,796 $ 738,291
Interest-bearing checking, percentage 15.80% 15.70%
Interest-bearing checking, percent increase (decrease) 3.20%  
Money market $ 1,665,732 $ 1,516,436
Money market, percentage 34.60% 32.30%
Money market, percent increase (decrease) 9.80%  
Savings $ 214,953 $ 221,900
Savings, percentage 4.50% 4.70%
Savings, percent increase (decrease) (3.10%)  
Time Deposits $ 807,641 $ 807,517
Time Deposits, percentage 16.80% 17.20%
Time Deposits, percent increase (decrease) 0.00%  
Total local deposits $ 4,632,897 $ 4,548,667
Total local deposits, percentage 96.30% 96.80%
Total local deposits 1.90%  
Out-of-area time, $100,000 and over $ 178,916 $ 149,699
Out-of-area time, $100,000 and over, percentage 3.70% 3.20%
Out-of-area time, $100,000 and over, percent increase (decrease) 19.50%  
Total deposits $ 4,811,813 $ 4,698,366
Total deposits, percentage 100.00% 100.00%
Total deposits, percent increase (decrease) 2.40%