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BUSINESS SEGMENTS (Results of Operations and Selected Financial Information) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Segment Reporting Information [Line Items]      
Interest income $ 648,880 $ 515,573 $ 449,199
Interest expense (88,010) (33,493) (41,829)
Net interest income 560,870 482,080 407,370
Provision for credit losses 60,638 24,119 221
Non-interest income, net 128,381 131,690 133,210
Non-interest expenses (363,365) (345,546) (325,756)
Intersegment revenue 0 0 0
Intersegment expenses 0 0 0
Income before income taxes 265,248 244,105 214,603
Income tax expense 83,376 77,866 68,452
Net income 181,872 166,239 146,151
Total assets 11,344,453 9,818,780 9,899,720
Total      
Segment Reporting Information [Line Items]      
Interest income 663,314 522,153 449,477
Interest expense (102,444) (40,073) (42,107)
Net interest income 560,870 482,080 407,370
Provision for credit losses 60,638 24,119 221
Non-interest income, net 128,381 131,690 133,210
Non-interest expenses (363,365) (345,546) (325,756)
Income before income taxes 265,248 244,105 214,603
Income tax expense 83,376 77,866 68,452
Net income 181,872 166,239 146,151
Total assets 12,496,666 10,803,401 10,968,419
Total | Intersubsegment Eliminations      
Segment Reporting Information [Line Items]      
Intersegment revenue 1,641 2,187 2,355
Intersegment expenses (1,641) (2,187) (2,355)
Eliminations      
Segment Reporting Information [Line Items]      
Interest income (14,434) (6,580) (278)
Interest expense 14,434 6,580 278
Net interest income 0 0 0
Provision for credit losses 0 0 0
Non-interest income, net 0 0 0
Non-interest expenses 0 0 0
Intersegment revenue (1,641) (2,187) (2,355)
Intersegment expenses 1,641 2,187 2,355
Income before income taxes 0 0 0
Income tax expense 0 0 0
Net income 0 0 0
Total assets (1,152,213) (984,621) (1,068,699)
Banking | Total      
Segment Reporting Information [Line Items]      
Interest income 567,809 465,177 432,375
Interest expense (73,480) (31,926) (38,711)
Net interest income 494,329 433,251 393,664
Provision for credit losses 60,255 24,111 1,342
Non-interest income, net 97,099 98,407 98,950
Non-interest expenses (344,488) (323,125) (300,568)
Income before income taxes 188,326 186,609 193,059
Income tax expense 83,242 77,731 68,409
Net income 105,084 108,878 124,650
Total assets 9,154,201 8,347,767 8,041,725
Banking | Total | Intersubsegment Eliminations      
Segment Reporting Information [Line Items]      
Intersegment revenue 1,641 2,187 2,355
Intersegment expenses 0 0 0
Wealth Management | Total      
Segment Reporting Information [Line Items]      
Interest income 28 21 30
Interest expense 0 0 0
Net interest income 28 21 30
Provision for credit losses 0 0 0
Non-interest income, net 32,433 33,481 35,625
Non-interest expenses (15,427) (19,206) (20,941)
Income before income taxes 16,023 12,799 13,445
Income tax expense 34 97 0
Net income 15,989 12,702 13,445
Total assets 38,261 23,085 32,082
Wealth Management | Total | Intersubsegment Eliminations      
Segment Reporting Information [Line Items]      
Intersegment revenue 0 0 0
Intersegment expenses (1,011) (1,497) (1,269)
Treasury | Total      
Segment Reporting Information [Line Items]      
Interest income 95,477 56,955 17,072
Interest expense (28,964) (8,147) (3,396)
Net interest income 66,513 48,808 13,676
Provision for credit losses 383 8 (1,121)
Non-interest income, net (1,151) (198) (1,365)
Non-interest expenses (3,450) (3,215) (4,247)
Income before income taxes 60,899 44,697 8,099
Income tax expense 100 38 43
Net income 60,799 44,659 8,056
Total assets 3,304,204 2,432,549 2,894,612
Treasury | Total | Intersubsegment Eliminations      
Segment Reporting Information [Line Items]      
Intersegment revenue 0 0 0
Intersegment expenses $ (630) $ (690) $ (1,086)