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Note 5 - Deposits - Summary of Deposits (Details) - USD ($)
 9 Months Ended
Sep. 30, 2023
Dec. 31, 2022
Noninterest-bearing $ 1,309,672,000 $ 1,604,750,000
Noninterest-bearing demand, percentage 33.60% 43.20%
Noninterest-bearing demand, percent increase (decrease) (18.40%)  
Interest-bearing checking $ 670,843,000 $ 575,028,000
Interest-bearing checking, percentage 17.20% 15.50%
Interest-bearing checking, percent increase (decrease) 16.70%  
Money market $ 976,348,000 $ 776,723,000
Money market, percentage 25.00% 20.90%
Money market, percent increase (decrease) 25.70%  
Savings $ 286,868,000 $ 381,602,000
Savings, percentage 7.40% 10.30%
Savings, percent increase (decrease) (24.80%)  
Local Time, under $100,000 $ 155,511,000 $ 113,099,000
Local Time, under $100,000, percentage 4.00% 3.00%
Local Time, under $100,000, percent increase (decrease) 37.50%  
Local Time, $100,000 and over $ 390,213,000 $ 261,609,000
Local Time, $100,000 and over, percentage 10.00% 7.10%
Local Time, $100,000 and over, percent increase (decrease) 49.20%  
Total local deposits $ 3,789,455,000 $ 3,712,811,000
Total local deposits, percentage 97.20% 100.00%
Total local deposits 2.10%  
Out-of-area time, $100,000 and over $ 111,280,000 $ 0
Out-of-area time, $100,000 and over, percentage 2.80% 0.00%
Total deposits $ 3,900,735,000 $ 3,712,811,000
Total deposits, percentage 100.00% 100.00%
Total deposits, percent increase (decrease) 5.10%