CREDIT QUALITY ASSESSMENT - Credit Quality of Loan Portfolio by Segment (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Financing Receivable, Past Due [Line Items]
Total loans	$ 11,537,966	$ 11,366,989
Performing loans:
Financing Receivable, Past Due [Line Items]
Total loans	11,418,594	11,275,142
Non-performing loans:
Financing Receivable, Past Due [Line Items]
Non-accrual loans	119,140	91,485
Loans greater than 90 days past due	232	362
Restructured loans	0	0
Total loans	119,372	91,847
Current | Performing loans:
Financing Receivable, Past Due [Line Items]
Total loans	11,349,246	11,248,749
30-59 days | Performing loans:
Financing Receivable, Past Due [Line Items]
Total loans	49,088	23,732
60-89 days | Performing loans:
Financing Receivable, Past Due [Line Items]
Total loans	20,260	2,661
Commercial Investor R/E
Financing Receivable, Past Due [Line Items]
Total loans	4,779,593	5,104,425
Commercial Owner- Occupied R/E
Financing Receivable, Past Due [Line Items]
Total loans	1,748,772	1,755,235
Commercial AD&C
Financing Receivable, Past Due [Line Items]
Total loans	1,327,292	988,967
Residential Mortgage
Financing Receivable, Past Due [Line Items]
Total loans	1,537,589	1,474,521
Residential Construction
Financing Receivable, Past Due [Line Items]
Total loans	49,028	121,419
Commercial Real Estate | Commercial Investor R/E
Financing Receivable, Past Due [Line Items]
Total loans	4,779,593	5,104,425
Commercial Real Estate | Commercial Investor R/E | Performing loans:
Financing Receivable, Past Due [Line Items]
Total loans	4,721,522	5,045,767
Commercial Real Estate | Commercial Investor R/E | Non-performing loans:
Financing Receivable, Past Due [Line Items]
Non-accrual loans	58,071	58,658
Loans greater than 90 days past due	0	0
Restructured loans	0	0
Total loans	58,071	58,658
Commercial Real Estate | Commercial Investor R/E | Current | Performing loans:
Financing Receivable, Past Due [Line Items]
Total loans	4,696,667	5,044,647
Commercial Real Estate | Commercial Investor R/E | 30-59 days | Performing loans:
Financing Receivable, Past Due [Line Items]
Total loans	7,753	1,120
Commercial Real Estate | Commercial Investor R/E | 60-89 days | Performing loans:
Financing Receivable, Past Due [Line Items]
Total loans	17,102	0
Commercial Real Estate | Commercial Owner- Occupied R/E
Financing Receivable, Past Due [Line Items]
Total loans	1,748,772	1,755,235
Commercial Real Estate | Commercial Owner- Occupied R/E | Performing loans:
Financing Receivable, Past Due [Line Items]
Total loans	1,741,764	1,750,595
Commercial Real Estate | Commercial Owner- Occupied R/E | Non-performing loans:
Financing Receivable, Past Due [Line Items]
Non-accrual loans	7,008	4,640
Loans greater than 90 days past due	0	0
Restructured loans	0	0
Total loans	7,008	4,640
Commercial Real Estate | Commercial Owner- Occupied R/E | Current | Performing loans:
Financing Receivable, Past Due [Line Items]
Total loans	1,740,403	1,748,449
Commercial Real Estate | Commercial Owner- Occupied R/E | 30-59 days | Performing loans:
Financing Receivable, Past Due [Line Items]
Total loans	1,361	2,056
Commercial Real Estate | Commercial Owner- Occupied R/E | 60-89 days | Performing loans:
Financing Receivable, Past Due [Line Items]
Total loans	0	90
Commercial Real Estate | Commercial AD&C
Financing Receivable, Past Due [Line Items]
Total loans	1,327,292	988,967
Commercial Real Estate | Commercial AD&C | Performing loans:
Financing Receivable, Past Due [Line Items]
Total loans	1,295,978	987,708
Commercial Real Estate | Commercial AD&C | Non-performing loans:
Financing Receivable, Past Due [Line Items]
Non-accrual loans	31,314	1,259
Loans greater than 90 days past due	0	0
Restructured loans	0	0
Total loans	31,314	1,259
Commercial Real Estate | Commercial AD&C | Current | Performing loans:
Financing Receivable, Past Due [Line Items]
Total loans	1,276,591	986,859
Commercial Real Estate | Commercial AD&C | 30-59 days | Performing loans:
Financing Receivable, Past Due [Line Items]
Total loans	19,387	849
Commercial Real Estate | Commercial AD&C | 60-89 days | Performing loans:
Financing Receivable, Past Due [Line Items]
Total loans	0	0
Commercial Business
Financing Receivable, Past Due [Line Items]
Total loans	9,508,792	9,353,507
Commercial Business | Commercial Business
Financing Receivable, Past Due [Line Items]
Total loans	1,653,135	1,504,880
Commercial Business | Commercial Business | Performing loans:
Financing Receivable, Past Due [Line Items]
Total loans	1,645,545	1,494,809
Commercial Business | Commercial Business | Non-performing loans:
Financing Receivable, Past Due [Line Items]
Non-accrual loans	7,590	10,051
Loans greater than 90 days past due	0	20
Restructured loans	0	0
Total loans	7,590	10,071
Commercial Business | Commercial Business | Current | Performing loans:
Financing Receivable, Past Due [Line Items]
Total loans	1,643,900	1,494,426
Commercial Business | Commercial Business | 30-59 days | Performing loans:
Financing Receivable, Past Due [Line Items]
Total loans	1,275	383
Commercial Business | Commercial Business | 60-89 days | Performing loans:
Financing Receivable, Past Due [Line Items]
Total loans	370	0
Residential Real Estate | Residential Mortgage
Financing Receivable, Past Due [Line Items]
Total loans	1,537,589	1,474,521
Residential Real Estate | Residential Mortgage | Performing loans:
Financing Receivable, Past Due [Line Items]
Total loans	1,526,418	1,461,847
Residential Real Estate | Residential Mortgage | Non-performing loans:
Financing Receivable, Past Due [Line Items]
Non-accrual loans	10,939	12,332
Loans greater than 90 days past due	232	342
Restructured loans	0	0
Total loans	11,171	12,674
Residential Real Estate | Residential Mortgage | Current | Performing loans:
Financing Receivable, Past Due [Line Items]
Total loans	1,509,013	1,445,785
Residential Real Estate | Residential Mortgage | 30-59 days | Performing loans:
Financing Receivable, Past Due [Line Items]
Total loans	15,071	14,026
Residential Real Estate | Residential Mortgage | 60-89 days | Performing loans:
Financing Receivable, Past Due [Line Items]
Total loans	2,334	2,036
Residential Real Estate | Residential Construction
Financing Receivable, Past Due [Line Items]
Total loans	49,028	121,419
Residential Real Estate | Residential Construction | Performing loans:
Financing Receivable, Past Due [Line Items]
Total loans	48,507	120,976
Residential Real Estate | Residential Construction | Non-performing loans:
Financing Receivable, Past Due [Line Items]
Non-accrual loans	521	443
Loans greater than 90 days past due	0	0
Restructured loans	0	0
Total loans	521	443
Residential Real Estate | Residential Construction | Current | Performing loans:
Financing Receivable, Past Due [Line Items]
Total loans	48,507	118,976
Residential Real Estate | Residential Construction | 30-59 days | Performing loans:
Financing Receivable, Past Due [Line Items]
Total loans	0	2,000
Residential Real Estate | Residential Construction | 60-89 days | Performing loans:
Financing Receivable, Past Due [Line Items]
Total loans	0	0
Consumer
Financing Receivable, Past Due [Line Items]
Total loans	442,557	417,542
Consumer | Performing loans:
Financing Receivable, Past Due [Line Items]
Total loans	438,860	413,440
Consumer | Non-performing loans:
Financing Receivable, Past Due [Line Items]
Non-accrual loans	3,697	4,102
Loans greater than 90 days past due	0	0
Restructured loans	0	0
Total loans	3,697	4,102
Consumer | Current | Performing loans:
Financing Receivable, Past Due [Line Items]
Total loans	434,165	409,607
Consumer | 30-59 days | Performing loans:
Financing Receivable, Past Due [Line Items]
Total loans	4,241	3,298
Consumer | 60-89 days | Performing loans:
Financing Receivable, Past Due [Line Items]
Total loans	$ 454	$ 535