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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Aging of Recorded Investment in Past Due Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Financing Receivable, Past Due [Line Items]
Loans receivable	$ 7,289,320	$ 7,251,480
30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	30,189	36,431
60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	8,505	3,711
Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Loans receivable	18,843	32,609
Total Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	57,537	72,751
Current
Financing Receivable, Past Due [Line Items]
Loans receivable	7,231,783	7,178,729
Commercial | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Loans receivable	1,993,416	2,668,984
Commercial | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans receivable	1,240,927	1,311,105
Commercial | Multifamily
Financing Receivable, Past Due [Line Items]
Loans receivable	1,698,455	1,361,054
Commercial | SBA
Financing Receivable, Past Due [Line Items]
Loans receivable	85,674	205,548
Commercial | Construction
Financing Receivable, Past Due [Line Items]
Loans receivable	236,495	181,841
Commercial | Loans and Finance Receivables, Traditional | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Loans receivable	1,993,416	2,668,984
Commercial | Loans and Finance Receivables, Traditional | Commercial and industrial | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	2,269	9,342
Commercial | Loans and Finance Receivables, Traditional | Commercial and industrial | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	5,670	1,351
Commercial | Loans and Finance Receivables, Traditional | Commercial and industrial | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Loans receivable	577	9,503
Commercial | Loans and Finance Receivables, Traditional | Commercial and industrial | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	8,516	20,196
Commercial | Loans and Finance Receivables, Traditional | Commercial and industrial | Current
Financing Receivable, Past Due [Line Items]
Loans receivable	1,984,900	2,648,788
Commercial | Loans and Finance Receivables, Traditional | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans receivable	1,240,927	1,311,105
Commercial | Loans and Finance Receivables, Traditional | Commercial real estate | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	0	0
Commercial | Loans and Finance Receivables, Traditional | Commercial real estate | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	0	0
Commercial | Loans and Finance Receivables, Traditional | Commercial real estate | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Loans receivable	910	0
Commercial | Loans and Finance Receivables, Traditional | Commercial real estate | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	910	0
Commercial | Loans and Finance Receivables, Traditional | Commercial real estate | Current
Financing Receivable, Past Due [Line Items]
Loans receivable	1,240,017	1,311,105
Commercial | Loans and Finance Receivables, Traditional | Multifamily
Financing Receivable, Past Due [Line Items]
Loans receivable	1,698,455	1,361,054
Commercial | Loans and Finance Receivables, Traditional | Multifamily | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	63	786
Commercial | Loans and Finance Receivables, Traditional | Multifamily | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	0	0
Commercial | Loans and Finance Receivables, Traditional | Multifamily | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Loans receivable	0	0
Commercial | Loans and Finance Receivables, Traditional | Multifamily | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	63	786
Commercial | Loans and Finance Receivables, Traditional | Multifamily | Current
Financing Receivable, Past Due [Line Items]
Loans receivable	1,698,392	1,360,268
Commercial | Loans and Finance Receivables, Traditional | SBA
Financing Receivable, Past Due [Line Items]
Loans receivable	85,674	205,548
Commercial | Loans and Finance Receivables, Traditional | SBA | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	1,205	987
Commercial | Loans and Finance Receivables, Traditional | SBA | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	128	2,360
Commercial | Loans and Finance Receivables, Traditional | SBA | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Loans receivable	10,168	15,941
Commercial | Loans and Finance Receivables, Traditional | SBA | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	11,501	19,288
Commercial | Loans and Finance Receivables, Traditional | SBA | Current
Financing Receivable, Past Due [Line Items]
Loans receivable	74,173	186,260
Commercial | Loans and Finance Receivables, Traditional | Construction
Financing Receivable, Past Due [Line Items]
Loans receivable	236,495	181,841
Commercial | Loans and Finance Receivables, Traditional | Construction | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	0	0
Commercial | Loans and Finance Receivables, Traditional | Construction | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	0	0
Commercial | Loans and Finance Receivables, Traditional | Construction | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Loans receivable	0	0
Commercial | Loans and Finance Receivables, Traditional | Construction | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	0	0
Commercial | Loans and Finance Receivables, Traditional | Construction | Current
Financing Receivable, Past Due [Line Items]
Loans receivable	236,495	181,841
Consumer | Single family residential mortgage
Financing Receivable, Past Due [Line Items]
Loans receivable	1,947,652	1,420,023
Consumer | Other consumer
Financing Receivable, Past Due [Line Items]
Loans receivable	86,701	102,925
Consumer | Loans and Finance Receivables, Traditional | Single family residential mortgage
Financing Receivable, Past Due [Line Items]
Loans receivable	1,947,652	1,420,023
Consumer | Loans and Finance Receivables, Traditional | Single family residential mortgage | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	26,593	24,867
Consumer | Loans and Finance Receivables, Traditional | Single family residential mortgage | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	2,707	0
Consumer | Loans and Finance Receivables, Traditional | Single family residential mortgage | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Loans receivable	7,107	7,076
Consumer | Loans and Finance Receivables, Traditional | Single family residential mortgage | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	36,407	31,943
Consumer | Loans and Finance Receivables, Traditional | Single family residential mortgage | Current
Financing Receivable, Past Due [Line Items]
Loans receivable	1,911,245	1,388,080
Consumer | Loans and Finance Receivables, Traditional | Other consumer
Financing Receivable, Past Due [Line Items]
Loans receivable	86,701	102,925
Consumer | Loans and Finance Receivables, Traditional | Other consumer | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	59	449
Consumer | Loans and Finance Receivables, Traditional | Other consumer | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	0	0
Consumer | Loans and Finance Receivables, Traditional | Other consumer | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Loans receivable	81	89
Consumer | Loans and Finance Receivables, Traditional | Other consumer | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	140	538
Consumer | Loans and Finance Receivables, Traditional | Other consumer | Current
Financing Receivable, Past Due [Line Items]
Loans receivable	$ 86,561	$ 102,387

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/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919230-210447

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 3B
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL120267963-210447

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+ References

No definition available.

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