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BUSINESS SEGMENTS (Results of Operations and Selected Financial Information) (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]          
Interest income $ 165,708 $ 134,675 $ 472,681 $ 369,846  
Interest expense (23,921) (8,165) (55,353) (23,048)  
Net interest income 141,787 126,510 417,328 346,798  
Provision for credit losses 16,430 7,120 40,919 15,362  
Non-interest income 30,699 30,620 89,673 98,436  
Non-interest expenses (90,158) (87,492) (269,266) (253,905)  
Intersegment revenue 0 0 0 0  
Intersegment expenses 0 0 0 0  
Income before income taxes 65,898 62,518 196,816 175,967  
Income tax expense (benefit) 21,025 20,599 61,541 56,095  
Net income 44,873 41,919 135,275 119,872  
Total assets 10,257,138 10,058,179 10,257,138 10,058,179 $ 9,818,780
Total          
Segment Reporting Information [Line Items]          
Interest income 169,580 136,774 485,982 372,820  
Interest expense (27,793) (10,264) (68,654) (26,022)  
Net interest income 141,787 126,510 417,328 346,798  
Provision for credit losses 16,430 7,120 40,919 15,362  
Non-interest income 30,699 30,620 89,673 98,436  
Non-interest expenses (90,158) (87,492) (269,266) (253,905)  
Income before income taxes 65,898 62,518 196,816 175,967  
Income tax expense (benefit) 21,025 20,599 61,541 56,095  
Net income 44,873 41,919 135,275 119,872  
Total assets 11,300,199 11,031,049 11,300,199 11,031,049  
Total | Intersubsegment Eliminations          
Segment Reporting Information [Line Items]          
Intersegment revenue 487 588 1,610 1,645  
Intersegment expenses (487) (588) (1,610) (1,645)  
Eliminations          
Segment Reporting Information [Line Items]          
Interest income (3,872) (2,099) (13,301) (2,974)  
Interest expense 3,872 2,099 13,301 2,974  
Net interest income 0 0 0 0  
Provision for credit losses 0 0 0 0  
Non-interest income 0 0 0 0  
Non-interest expenses 0 0 0 0  
Intersegment revenue (487) (588) (1,610) (1,645)  
Intersegment expenses 487 588 1,610 1,645  
Income before income taxes 0 0 0 0  
Income tax expense (benefit) 0 0 0 0  
Net income 0 0 0 0  
Total assets (1,043,061) (972,870) (1,043,061) (972,870)  
Banking | Total          
Segment Reporting Information [Line Items]          
Interest income 145,667 117,939 418,091 337,017  
Interest expense (20,662) (7,891) (48,867) (21,796)  
Net interest income 125,005 110,048 369,224 315,221  
Provision for credit losses 16,371 7,059 40,828 15,403  
Non-interest income 23,211 22,310 68,190 73,662  
Non-interest expenses (85,536) (82,026) (254,777) (237,477)  
Income before income taxes 46,796 43,861 143,419 137,648  
Income tax expense (benefit) 20,994 20,589 61,463 56,067  
Net income 25,802 23,272 81,956 81,581  
Total assets 8,742,283 8,179,384 8,742,283 8,179,384  
Banking | Total | Intersubsegment Eliminations          
Segment Reporting Information [Line Items]          
Intersegment revenue 487 588 1,610 1,645  
Intersegment expenses 0 0 0 0  
Wealth Management | Total          
Segment Reporting Information [Line Items]          
Interest income 8 6 19 16  
Interest expense 0 0 0 0  
Net interest income 8 6 19 16  
Provision for credit losses 0 0 0 0  
Non-interest income 7,487 8,310 22,631 24,724  
Non-interest expenses (3,778) (4,635) (11,871) (14,015)  
Income before income taxes 3,380 3,269 9,683 9,594  
Income tax expense (benefit) (4) 1 16 1  
Net income 3,384 3,268 9,667 9,593  
Total assets 34,380 27,839 34,380 27,839  
Wealth Management | Total | Intersubsegment Eliminations          
Segment Reporting Information [Line Items]          
Intersegment revenue 0 0 0 0  
Intersegment expenses (337) (412) (1,096) (1,131)  
Treasury | Total          
Segment Reporting Information [Line Items]          
Interest income 23,905 18,829 67,872 35,787  
Interest expense (7,131) (2,373) (19,787) (4,226)  
Net interest income 16,774 16,456 48,085 31,561  
Provision for credit losses 59 61 91 (41)  
Non-interest income 1 0 (1,148) 50  
Non-interest expenses (844) (831) (2,618) (2,413)  
Income before income taxes 15,722 15,388 43,714 28,725  
Income tax expense (benefit) 35 9 62 27  
Net income 15,687 15,379 43,652 28,698  
Total assets 2,523,536 2,823,826 2,523,536 2,823,826  
Treasury | Total | Intersubsegment Eliminations          
Segment Reporting Information [Line Items]          
Intersegment revenue 0 0 0 0  
Intersegment expenses $ (150) $ (176) $ (514) $ (514)