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Operating Segments and Related Information - Summary of information relating to operating segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Segment Reporting Information [Line Items]          
Goodwill $ 317,873   $ 317,873   $ 317,873
Total Assets 12,258,250   12,258,250   12,336,677
Net interest income 77,791 $ 86,305 242,318 $ 232,289  
Noninterest income 31,008 30,933 90,868 97,724  
Noninterest expense 70,945 70,736 210,553 210,204  
Income before income taxes 37,490 44,138 120,689 116,045  
Net income 30,666 35,661 96,816 93,924  
Operating segment | Banking          
Segment Reporting Information [Line Items]          
Goodwill 294,773   294,773   294,773
Total Assets 12,104,706   12,104,706   12,199,960
Net interest income 81,794 90,916 254,394 244,820  
Noninterest income 11,983 13,559 34,716 42,827  
Noninterest expense 55,172 55,273 163,314 165,220  
Income before income taxes 38,241 46,838 123,852 118,663  
Net income 31,189 37,082 98,689 94,032  
Operating segment | Wealth Management          
Segment Reporting Information [Line Items]          
Goodwill 14,108   14,108   14,108
Total Assets 98,755   98,755   84,082
Noninterest income 14,350 12,514 43,993 42,425  
Noninterest expense 8,059 7,682 24,821 23,533  
Income before income taxes 6,291 4,832 19,172 18,892  
Net income 4,781 3,756 14,571 14,688  
Operating segment | FirsTech          
Segment Reporting Information [Line Items]          
Goodwill 8,992   8,992   8,992
Total Assets 50,689   50,689   48,715
Net interest income 14 15 41 50  
Noninterest income 5,665 5,578 16,954 16,333  
Noninterest expense 5,245 5,109 16,303 14,601  
Income before income taxes 434 484 692 1,782  
Net income 317 353 505 1,300  
Intersegment Eliminations          
Segment Reporting Information [Line Items]          
Goodwill 0   0   0
Total Assets 4,100   4,100   $ 3,920
Net interest income (4,017) (4,626) (12,117) (12,581)  
Noninterest income (990) (718) (4,795) (3,861)  
Noninterest expense 2,469 2,672 6,115 6,850  
Income before income taxes (7,476) (8,016) (23,027) (23,292)  
Net income $ (5,621) $ (5,530) $ (16,949) $ (16,096)