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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Collateral Dependent Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Impaired [Line Items]
Total recorded investment	$ 7,251,480	$ 5,898,405
Collateral
Financing Receivable, Impaired [Line Items]
Total recorded investment	49,236	36,684
Commercial and industrial | Collateral
Financing Receivable, Impaired [Line Items]
Total recorded investment	18,331	10,457
Commercial real estate | Collateral
Financing Receivable, Impaired [Line Items]
Total recorded investment	0	4,654
Multifamily | Collateral
Financing Receivable, Impaired [Line Items]
Total recorded investment	0	0
SBA | Collateral
Financing Receivable, Impaired [Line Items]
Total recorded investment	16,658	3,596
Construction | Collateral
Financing Receivable, Impaired [Line Items]
Total recorded investment	0	0
Single family residential mortgage
Financing Receivable, Impaired [Line Items]
Total recorded investment		1,230,236
Single family residential mortgage | Collateral
Financing Receivable, Impaired [Line Items]
Total recorded investment	14,012	17,820
Other consumer
Financing Receivable, Impaired [Line Items]
Total recorded investment		33,386
Other consumer | Collateral
Financing Receivable, Impaired [Line Items]
Total recorded investment	235	157
Commercial | Collateral
Financing Receivable, Impaired [Line Items]
Total recorded investment	14,207	8,485
Commercial | Commercial and industrial
Financing Receivable, Impaired [Line Items]
Total recorded investment	2,668,984	2,088,308
Commercial | Commercial and industrial | Collateral
Financing Receivable, Impaired [Line Items]
Total recorded investment	13,518	5,492
Commercial | Commercial real estate | Collateral
Financing Receivable, Impaired [Line Items]
Total recorded investment	0	2,644
Commercial | Multifamily
Financing Receivable, Impaired [Line Items]
Total recorded investment	1,361,054	1,289,820
Commercial | Multifamily | Collateral
Financing Receivable, Impaired [Line Items]
Total recorded investment	0	0
Commercial | SBA
Financing Receivable, Impaired [Line Items]
Total recorded investment	205,548	273,444
Commercial | SBA | Collateral
Financing Receivable, Impaired [Line Items]
Total recorded investment	689	349
Commercial | Construction
Financing Receivable, Impaired [Line Items]
Total recorded investment	181,841	176,016
Commercial | Construction | Collateral
Financing Receivable, Impaired [Line Items]
Total recorded investment	0	0
Commercial | Single family residential mortgage | Collateral
Financing Receivable, Impaired [Line Items]
Total recorded investment	0	0
Commercial | Other consumer | Collateral
Financing Receivable, Impaired [Line Items]
Total recorded investment	0	0
Residential | Collateral
Financing Receivable, Impaired [Line Items]
Total recorded investment	18,507	20,484
Residential | Commercial and industrial | Collateral
Financing Receivable, Impaired [Line Items]
Total recorded investment	37	0
Residential | Commercial real estate | Collateral
Financing Receivable, Impaired [Line Items]
Total recorded investment	0	2,010
Residential | Multifamily | Collateral
Financing Receivable, Impaired [Line Items]
Total recorded investment	0	0
Residential | SBA | Collateral
Financing Receivable, Impaired [Line Items]
Total recorded investment	4,458	497
Residential | Construction | Collateral
Financing Receivable, Impaired [Line Items]
Total recorded investment	0	0
Residential | Single family residential mortgage | Collateral
Financing Receivable, Impaired [Line Items]
Total recorded investment	14,012	17,820
Residential | Other consumer | Collateral
Financing Receivable, Impaired [Line Items]
Total recorded investment	0	157
Business Assets | Collateral
Financing Receivable, Impaired [Line Items]
Total recorded investment	16,287	7,715
Business Assets | Commercial and industrial | Collateral
Financing Receivable, Impaired [Line Items]
Total recorded investment	4,776	4,965
Business Assets | Commercial real estate | Collateral
Financing Receivable, Impaired [Line Items]
Total recorded investment	0	0
Business Assets | Multifamily | Collateral
Financing Receivable, Impaired [Line Items]
Total recorded investment	0	0
Business Assets | SBA | Collateral
Financing Receivable, Impaired [Line Items]
Total recorded investment	11,511	2,750
Business Assets | Construction | Collateral
Financing Receivable, Impaired [Line Items]
Total recorded investment	0	0
Business Assets | Single family residential mortgage | Collateral
Financing Receivable, Impaired [Line Items]
Total recorded investment	0	0
Business Assets | Other consumer | Collateral
Financing Receivable, Impaired [Line Items]
Total recorded investment	0	$ 0
Automobile | Collateral
Financing Receivable, Impaired [Line Items]
Total recorded investment	235
Automobile | Commercial and industrial | Collateral
Financing Receivable, Impaired [Line Items]
Total recorded investment	0
Automobile | Commercial real estate | Collateral
Financing Receivable, Impaired [Line Items]
Total recorded investment	0
Automobile | Multifamily | Collateral
Financing Receivable, Impaired [Line Items]
Total recorded investment	0
Automobile | SBA | Collateral
Financing Receivable, Impaired [Line Items]
Total recorded investment	0
Automobile | Construction | Collateral
Financing Receivable, Impaired [Line Items]
Total recorded investment	0
Automobile | Single family residential mortgage | Collateral
Financing Receivable, Impaired [Line Items]
Total recorded investment	0
Automobile | Other consumer | Collateral
Financing Receivable, Impaired [Line Items]
Total recorded investment	$ 235

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+ 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 http://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 http://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 http://asc.fasb.org/extlink&oid=124255953&loc=SL120267963-210447

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