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BUSINESS SEGMENTS (Results of Operations and Selected Financial Information) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment Reporting Information [Line Items]      
Interest income $ 750,277 $ 648,880 $ 515,573
Interest expense (161,837) (88,010) (33,493)
Net interest income 588,440 560,870 482,080
(Provision for) recapture of credit losses (82,251) (60,638) (24,119)
Non-interest income, net 123,249 128,381 131,690
Non-interest expense:      
Compensation and employee benefits (159,710) (155,827) (142,930)
Occupancy, equipment and infrastructure costs (38,249)    
Depreciation and amortization of premises and equipment (20,874)    
Electronic banking charges (42,816) (41,336) (39,554)
Information technology expenses (27,582) (27,162) (21,891)
Professional and service fees (18,876) (18,764) (24,842)
Loan servicing and clearing expenses (7,935) (7,774) (9,161)
Amortization of other intangible assets (1,385)    
Intersegment expenses 0    
Other (58,263)    
Total non-interest expense (375,690) (363,365) (345,546)
Income before income taxes 253,748 265,248 244,105
Income tax expense (55,578) (83,376) (77,866)
Net income 198,170 181,872 166,239
Total assets 11,500,734 11,344,453  
Expenditures for long-lived assets 21,336    
Reportable Segment      
Segment Reporting Information [Line Items]      
Interest income   648,880 515,573
Interest expense   (88,010) (33,493)
Net interest income   560,870 482,080
(Provision for) recapture of credit losses   (60,638) (24,119)
Non-interest income, net   128,381 131,690
Non-interest expense:      
Compensation and employee benefits   (155,827) (142,930)
Occupancy, equipment and infrastructure costs   (38,847) (35,497)
Depreciation and amortization of premises and equipment   (20,388) (15,811)
Electronic banking charges   (41,336) (39,554)
Information technology expenses   (27,162) (21,891)
Professional and service fees   (18,764) (24,842)
Loan servicing and clearing expenses   (7,774) (9,161)
Amortization of other intangible assets   (1,615) (2,001)
Intersegment expenses   0 0
Other   (51,652) (53,859)
Total non-interest expense   (363,365) (345,546)
Income before income taxes   265,248 244,105
Income tax expense   (83,376) (77,866)
Net income   181,872 166,239
Total assets   11,344,453 9,818,780
Expenditures for long-lived assets   17,857 30,999
Total      
Segment Reporting Information [Line Items]      
Interest income 754,324 663,314 522,153
Interest expense (165,884) (102,444) (40,073)
Net interest income 588,440 560,870 482,080
(Provision for) recapture of credit losses (82,251) (60,638) (24,119)
Non-interest income, net 123,249 128,381 131,690
Non-interest expense:      
Compensation and employee benefits (159,710) (155,827) (142,930)
Occupancy, equipment and infrastructure costs (38,249) (38,847) (35,497)
Depreciation and amortization of premises and equipment (20,874) (20,388) (15,811)
Electronic banking charges (42,816) (41,336) (39,554)
Information technology expenses (27,582) (27,162) (21,891)
Professional and service fees (18,876) (18,764) (24,842)
Loan servicing and clearing expenses (7,935) (7,774) (9,161)
Amortization of other intangible assets (1,385) (1,615) (2,001)
Intersegment expenses 0 0 0
Other (58,263) (51,652) (53,859)
Total non-interest expense (375,690) (363,365) (345,546)
Income before income taxes 253,748 265,248 244,105
Income tax expense (55,578) (83,376) (77,866)
Net income 198,170 181,872 166,239
Total assets 12,740,138 12,496,666 10,803,401
Expenditures for long-lived assets 21,336 17,857 30,999
Total | Banking      
Segment Reporting Information [Line Items]      
Interest income 619,328 567,809 465,177
Interest expense (147,661) (73,480) (31,926)
Net interest income 471,667 494,329 433,251
(Provision for) recapture of credit losses (82,436) (60,255) (24,111)
Non-interest income, net 86,720 97,099 98,407
Non-interest expense:      
Compensation and employee benefits (149,194) (147,241) (132,840)
Occupancy, equipment and infrastructure costs (37,407) (38,251) (34,369)
Depreciation and amortization of premises and equipment (20,807) (20,315) (15,724)
Electronic banking charges (42,816) (41,336) (39,554)
Information technology expenses (27,394) (26,946) (21,669)
Professional and service fees (15,804) (15,878) (21,818)
Loan servicing and clearing expenses (5,937) (5,806) (7,203)
Amortization of other intangible assets (1,385) (1,615) (2,001)
Intersegment expenses 3,518 1,641 2,187
Other (56,173) (47,100) (47,947)
Total non-interest expense (353,399) (342,847) (320,938)
Income before income taxes 122,552 188,326 186,609
Income tax expense (55,402) (83,242) (77,731)
Net income 67,150 105,084 108,878
Total assets 9,513,074 9,154,201 8,347,767
Expenditures for long-lived assets 21,336 17,853 30,982
Total | Wealth Management      
Segment Reporting Information [Line Items]      
Interest income 26 28 21
Interest expense 0 0 0
Net interest income 26 28 21
(Provision for) recapture of credit losses 0 0 0
Non-interest income, net 36,522 32,433 33,481
Non-interest expense:      
Compensation and employee benefits (9,527) (7,627) (9,174)
Occupancy, equipment and infrastructure costs (721) (484) (1,033)
Depreciation and amortization of premises and equipment (48) (50) (58)
Electronic banking charges 0 0 0
Information technology expenses (187) (204) (222)
Professional and service fees (2,875) (2,646) (2,774)
Loan servicing and clearing expenses (1,455) (1,417) (1,396)
Amortization of other intangible assets 0 0 0
Intersegment expenses (2,121) (1,011) (1,497)
Other (1,720) (2,999) (4,549)
Total non-interest expense (18,654) (16,438) (20,703)
Income before income taxes 17,894 16,023 12,799
Income tax expense (10) (34) (97)
Net income 17,884 15,989 12,702
Total assets 34,219 38,261 23,085
Expenditures for long-lived assets 0 2 17
Total | Treasury      
Segment Reporting Information [Line Items]      
Interest income 134,970 95,477 56,955
Interest expense (18,223) (28,964) (8,147)
Net interest income 116,747 66,513 48,808
(Provision for) recapture of credit losses 185 (383) (8)
Non-interest income, net 7 (1,151) (198)
Non-interest expense:      
Compensation and employee benefits (989) (959) (916)
Occupancy, equipment and infrastructure costs (121) (112) (95)
Depreciation and amortization of premises and equipment (19) (23) (29)
Electronic banking charges 0 0 0
Information technology expenses (1) (12) 0
Professional and service fees (197) (240) (250)
Loan servicing and clearing expenses (543) (551) (562)
Amortization of other intangible assets 0 0 0
Intersegment expenses (1,397) (630) (690)
Other (370) (1,553) (1,363)
Total non-interest expense (3,637) (4,080) (3,905)
Income before income taxes 113,302 60,899 44,697
Income tax expense (166) (100) (38)
Net income 113,136 60,799 44,659
Total assets 3,192,845 3,304,204 2,432,549
Expenditures for long-lived assets 0 2 0
Eliminations      
Segment Reporting Information [Line Items]      
Interest income (4,047) (14,434) (6,850)
Interest expense 4,047 14,434 6,850
Net interest income 0 0 0
(Provision for) recapture of credit losses 0 0 0
Non-interest income, net 0 0 0
Non-interest expense:      
Compensation and employee benefits 0 0 0
Occupancy, equipment and infrastructure costs 0 0 0
Depreciation and amortization of premises and equipment 0 0 0
Electronic banking charges 0 0 0
Information technology expenses 0 0 0
Professional and service fees 0 0 0
Loan servicing and clearing expenses 0 0 0
Amortization of other intangible assets 0 0 0
Intersegment expenses 0 0 0
Other 0 0 0
Total non-interest expense 0 0 0
Income before income taxes 0 0 0
Income tax expense 0 0 0
Net income 0 0 0
Total assets (1,239,404) (1,152,213) (984,621)
Expenditures for long-lived assets $ 0 $ 0 $ 0