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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)

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