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Operating Segments and Related Information - Summary of information relating to operating segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Segment Reporting Information [Line Items]          
Goodwill $ 317,873   $ 317,873   $ 317,873
Total Assets 12,209,029   12,209,029   12,336,677
Net interest income 78,670 $ 75,928 164,527 $ 145,984  
Noninterest income 28,012 31,019 59,860 66,791  
Noninterest expense 69,205 69,092 139,608 139,468  
Income before income taxes 36,850 36,202 83,199 71,907  
Net income 29,364 29,824 66,150 58,263  
Operating segment | Banking          
Segment Reporting Information [Line Items]          
Goodwill 294,773   294,773   294,773
Total Assets 12,057,131   12,057,131   12,199,960
Net interest income 82,710 80,072 172,600 153,904  
Noninterest income 10,312 13,982 22,733 29,268  
Noninterest expense 53,491 54,380 108,142 109,947  
Income before income taxes 38,904 38,021 85,611 71,825  
Net income 30,665 30,499 67,500 56,950  
Operating segment | FirsTech          
Segment Reporting Information [Line Items]          
Goodwill 8,992   8,992   8,992
Total Assets 48,558   48,558   48,715
Net interest income 14 17 27 35  
Noninterest income 5,615 5,336 11,289 10,755  
Noninterest expense 5,319 4,809 11,058 9,492  
Income before income taxes 310 544 258 1,298  
Net income 226 397 188 947  
Operating segment | Wealth Management          
Segment Reporting Information [Line Items]          
Goodwill 14,108   14,108   14,108
Total Assets 93,408   93,408   84,082
Noninterest income 14,717 14,135 29,643 29,911  
Noninterest expense 8,228 7,586 16,762 15,851  
Income before income taxes 6,489 6,549 12,881 14,060  
Net income 4,932 5,092 9,790 10,932  
Intersegment Eliminations          
Segment Reporting Information [Line Items]          
Goodwill 0   0   0
Total Assets 9,932   9,932   $ 3,920
Net interest income (4,054) (4,161) (8,100) (7,955)  
Noninterest income (2,632) (2,434) (3,805) (3,143)  
Noninterest expense 2,167 2,317 3,646 4,178  
Income before income taxes (8,853) (8,912) (15,551) (15,276)  
Net income $ (6,459) $ (6,164) $ (11,328) $ (10,566)