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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Collateral Dependent Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Jul. 25, 2023	Dec. 31, 2022
Financing Receivable, Impaired [Line Items]
Total loans	$ 6,961,032		$ 7,115,038
Collateral Pledged
Financing Receivable, Impaired [Line Items]
Total loans	57,504		51,174
Commercial
Financing Receivable, Impaired [Line Items]
Total loans	2,457		933
Residential
Financing Receivable, Impaired [Line Items]
Total loans	41,302		26,045
Business Assets
Financing Receivable, Impaired [Line Items]
Total loans	13,419		24,083
Automobile
Financing Receivable, Impaired [Line Items]
Total loans	326		113
Commercial | Commercial and industrial
Financing Receivable, Impaired [Line Items]
Total loans	1,942,964		1,845,960
Commercial | Commercial real estate
Financing Receivable, Impaired [Line Items]
Total loans	1,173,332		1,259,651
Commercial | Multifamily
Financing Receivable, Impaired [Line Items]
Total loans	1,654,272		1,689,943
Collateral dependent loans	1,118
Commercial | SBA
Financing Receivable, Impaired [Line Items]
Total loans	56,600		68,137
Commercial | Collateral Pledged | Commercial and industrial
Financing Receivable, Impaired [Line Items]
Total loans	6,661		18,392
Commercial | Collateral Pledged | Commercial real estate
Financing Receivable, Impaired [Line Items]
Total loans	1,864		910
Commercial | Collateral Pledged | SBA
Financing Receivable, Impaired [Line Items]
Total loans	7,569		10,416
Commercial | Commercial | Commercial and industrial
Financing Receivable, Impaired [Line Items]
Total loans	0		0
Commercial | Commercial | Commercial real estate
Financing Receivable, Impaired [Line Items]
Total loans	1,324		910
Commercial | Commercial | Multifamily
Financing Receivable, Impaired [Line Items]
Collateral dependent loans	1,118
Commercial | Commercial | SBA
Financing Receivable, Impaired [Line Items]
Total loans	15		23
Commercial | Residential | Commercial and industrial
Financing Receivable, Impaired [Line Items]
Total loans	0		0
Commercial | Residential | Commercial real estate
Financing Receivable, Impaired [Line Items]
Total loans	540		0
Commercial | Residential | Multifamily
Financing Receivable, Impaired [Line Items]
Collateral dependent loans	0
Commercial | Residential | SBA
Financing Receivable, Impaired [Line Items]
Total loans	796		4,702
Commercial | Business Assets | Commercial and industrial
Financing Receivable, Impaired [Line Items]
Total loans	6,661		18,392
Commercial | Business Assets | Commercial real estate
Financing Receivable, Impaired [Line Items]
Total loans	0		0
Commercial | Business Assets | Multifamily
Financing Receivable, Impaired [Line Items]
Collateral dependent loans	0
Commercial | Business Assets | SBA
Financing Receivable, Impaired [Line Items]
Total loans	6,758		5,691
Commercial | Automobile | Commercial and industrial
Financing Receivable, Impaired [Line Items]
Total loans	0		0
Commercial | Automobile | Commercial real estate
Financing Receivable, Impaired [Line Items]
Total loans	0		0
Commercial | Automobile | Multifamily
Financing Receivable, Impaired [Line Items]
Collateral dependent loans	0
Commercial | Automobile | SBA
Financing Receivable, Impaired [Line Items]
Total loans	0		0
Consumer | Single family residential mortgage
Financing Receivable, Impaired [Line Items]
Total loans	1,782,655	$ 1,800,000	1,920,806
Consumer | Other consumer
Financing Receivable, Impaired [Line Items]
Total loans	88,494		86,988
Consumer | Collateral Pledged | Single family residential mortgage
Financing Receivable, Impaired [Line Items]
Total loans	39,836		21,262
Consumer | Collateral Pledged | Other consumer
Financing Receivable, Impaired [Line Items]
Total loans	456		194
Consumer | Commercial | Single family residential mortgage
Financing Receivable, Impaired [Line Items]
Total loans	0		0
Consumer | Commercial | Other consumer
Financing Receivable, Impaired [Line Items]
Total loans	0		0
Consumer | Residential | Single family residential mortgage
Financing Receivable, Impaired [Line Items]
Total loans	39,836		21,262
Consumer | Residential | Other consumer
Financing Receivable, Impaired [Line Items]
Total loans	130		81
Consumer | Business Assets | Single family residential mortgage
Financing Receivable, Impaired [Line Items]
Total loans	0		0
Consumer | Business Assets | Other consumer
Financing Receivable, Impaired [Line Items]
Total loans	0		0
Consumer | Automobile | Single family residential mortgage
Financing Receivable, Impaired [Line Items]
Total loans	0		0
Consumer | Automobile | Other consumer
Financing Receivable, Impaired [Line Items]
Total loans	$ 326		$ 113

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
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