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Note 5 - Deposits - Summary of Deposits (Details) - USD ($)
 3 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Noninterest-bearing checking $ 1,605,471,000 $ 1,433,403,000
Noninterest-bearing checking, percentage 44.00% 42.00%
Noninterest-bearing checking, percent increase (decrease) 12.00%  
Interest-bearing checking $ 494,495,000 $ 473,053,000
Interest-bearing checking, percentage 13.60% 13.90%
Interest-bearing checking, percent increase (decrease) 4.50%  
Money market $ 673,944,000 $ 611,912,000
Money market, percentage 18.50% 17.90%
Money market, percent increase (decrease) 10.10%  
Savings $ 371,344,000 $ 338,070,000
Savings, percentage 10.20% 9.90%
Savings, percent increase (decrease) 9.80%  
Local Time, under $100,000 $ 151,572,000 $ 165,548,000
Local Time, under $100,000, percentage 4.20% 4.90%
Local Time, under $100,000, percent increase (decrease) (8.40%)  
Local Time, $100,000 and over $ 317,223,000 $ 342,633,000
Local Time, $100,000 and over, percentage 8.70% 10.00%
Local Time, $100,000 and over, percent increase (decrease) (7.40%)  
Total local deposits $ 3,614,049,000 $ 3,364,619,000
Total local deposits, percentage 99.20% 98.60%
Total local deposits, percent increase (decrease) 7.40%  
Out-of-area time, $100,000 and over $ 30,913,000 $ 46,934,000
Out-of-area time, $100,000 and over, percentage 0.80% 1.40%
Out-of-area time, $100,000 and over, percent increase (decrease) (34.10%)  
Total deposits $ 3,644,962,000 $ 3,411,553,000
Total deposits, percentage 100.00% 100.00%
Total deposits, percent increase (decrease) 6.80%