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OPERATING SEGMENTS AND RELATED INFORMATION - Summary of information relating to operating segments (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Segment Reporting Information [Line Items]      
Goodwill $ 317,873   $ 317,873
Total Assets 11,887,458   12,283,415
Net interest income 75,767 $ 85,857  
Noninterest income 35,000 31,848  
Noninterest expense 70,769 70,403  
Income before income taxes 34,960 46,349  
Net income 26,225 36,786  
Operating segment | Banking      
Segment Reporting Information [Line Items]      
Goodwill 294,773   294,773
Total Assets 11,722,919   12,125,298
Net interest income 79,533 89,890  
Noninterest income 13,472 12,421  
Noninterest expense 52,387 54,651  
Income before income taxes 35,580 46,707  
Net income 26,492 36,835  
Operating segment | Wealth Management      
Segment Reporting Information [Line Items]      
Goodwill 14,108   14,108
Total Assets 107,251   103,147
Noninterest income 15,712 14,926  
Noninterest expense 9,136 8,534  
Income before income taxes 6,576 6,392  
Net income 4,998 4,858  
Operating segment | FirsTech      
Segment Reporting Information [Line Items]      
Goodwill 8,992   8,992
Total Assets 50,643   51,600
Net interest income 13 13  
Noninterest income 5,971 5,674  
Noninterest expense 5,866 5,739  
Income before income taxes 118 (52)  
Net income 86 (38)  
Intersegment Eliminations      
Segment Reporting Information [Line Items]      
Goodwill 0   0
Total Assets 6,645   $ 3,370
Net interest income (3,779) (4,046)  
Noninterest income (155) (1,173)  
Noninterest expense 3,380 1,479  
Income before income taxes (7,314) (6,698)  
Net income $ (5,351) $ (4,869)