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PORTFOLIO LOANS - Summary of risk grades segregated by category of portfolio loans (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	$ 7,588,077	$ 7,651,034
Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	6,663,672	6,736,067
Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	722,802	747,122
Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	96,308	96,057
Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	87,830	64,347
Substandard Non-accrual
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	17,465	7,441
Total commercial loans
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	5,606,241	5,635,048
Total commercial loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	4,698,629	4,737,796
Total commercial loans | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	713,431	735,978
Total commercial loans | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	95,386	95,033
Total commercial loans | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	85,141	62,552
Total commercial loans | Substandard Non-accrual
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	13,654	3,689
C&I and other commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	1,828,711	1,835,994
C&I and other commercial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	1,491,166	1,462,755
C&I and other commercial | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	243,635	296,416
C&I and other commercial | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	37,711	46,488
C&I and other commercial | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	42,853	27,733
C&I and other commercial | Substandard Non-accrual
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	13,346	2,602
Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	3,331,670	3,337,337
Commercial real estate | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	2,797,374	2,827,030
Commercial real estate | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	447,313	431,427
Commercial real estate | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	49,932	48,545
Commercial real estate | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	36,987	29,492
Commercial real estate | Substandard Non-accrual
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	64	843
Real estate construction
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	445,860	461,717
Real estate construction | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	410,089	448,011
Real estate construction | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	22,483	8,135
Real estate construction | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	7,743	0
Real estate construction | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	5,301	5,327
Real estate construction | Substandard Non-accrual
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	244	244
Total retail loans
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	1,981,836	2,015,986
Total retail loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	1,965,043	1,998,271
Total retail loans | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	9,371	11,144
Total retail loans | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	922	1,024
Total retail loans | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	2,689	1,795
Total retail loans | Substandard Non-accrual
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	3,811	3,752
Retail real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	1,708,663	1,720,455
Retail real estate | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	1,692,013	1,702,897
Retail real estate | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	9,371	11,144
Retail real estate | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	922	1,024
Retail real estate | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	2,689	1,795
Retail real estate | Substandard Non-accrual
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	3,668	3,595
Retail other
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	273,173	295,531
Retail other | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	273,030	295,374
Retail other | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	0	0
Retail other | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	0	0
Retail other | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	0	0
Retail other | Substandard Non-accrual
Financing Receivable, Credit Quality Indicator [Line Items]
Commercial loans	$ 143	$ 157

X

- Definition

Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease.

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