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Note 2 - Mergers/Acquisitions/Sales - Unaudited Pro Forma Combined Operating Results (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Unaudited pro forma combined operating results |  |
Net interest income | $ 242,161 | $ 222,839
Noninterest income | 82,966 | 114,095
Net income | $ 119,899 | $ 99,606
Earnings per common share - Basic | $ 6.97 | $ 5.60
Earnings per common share - Diluted | $ 6.89 | $ 5.53

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