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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Aging of Recorded Investment in Past Due Loans and Leases (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Past Due [Line Items]
Total recorded investment	$ 7,251,480	$ 5,898,405
30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total recorded investment	36,431	11,673
60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total recorded investment	3,711	2,308
Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Total recorded investment	32,609	17,636
Total Past Due
Financing Receivable, Past Due [Line Items]
Total recorded investment	72,751	31,617
Current
Financing Receivable, Past Due [Line Items]
Total recorded investment	7,178,729	5,866,788
Single family residential mortgage
Financing Receivable, Past Due [Line Items]
Total recorded investment		1,230,236
Other consumer
Financing Receivable, Past Due [Line Items]
Total recorded investment		33,386
Commercial | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total recorded investment	2,668,984	2,088,308
Commercial | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total recorded investment	1,311,105	807,195
Commercial | Multifamily
Financing Receivable, Past Due [Line Items]
Total recorded investment	1,361,054	1,289,820
Commercial | SBA
Financing Receivable, Past Due [Line Items]
Total recorded investment	205,548	273,444
Commercial | Construction
Financing Receivable, Past Due [Line Items]
Total recorded investment	181,841	176,016
Commercial | Loans and Finance Receivables, Traditional Loans | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total recorded investment	2,668,984	2,088,308
Commercial | Loans and Finance Receivables, Traditional Loans | Commercial and industrial | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total recorded investment	9,342	67
Commercial | Loans and Finance Receivables, Traditional Loans | Commercial and industrial | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total recorded investment	1,351	0
Commercial | Loans and Finance Receivables, Traditional Loans | Commercial and industrial | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Total recorded investment	9,503	4,284
Commercial | Loans and Finance Receivables, Traditional Loans | Commercial and industrial | Total Past Due
Financing Receivable, Past Due [Line Items]
Total recorded investment	20,196	4,351
Commercial | Loans and Finance Receivables, Traditional Loans | Commercial and industrial | Current
Financing Receivable, Past Due [Line Items]
Total recorded investment	2,648,788	2,083,957
Commercial | Loans and Finance Receivables, Traditional Loans | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total recorded investment	1,311,105	807,195
Commercial | Loans and Finance Receivables, Traditional Loans | Commercial real estate | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total recorded investment	0	0
Commercial | Loans and Finance Receivables, Traditional Loans | Commercial real estate | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total recorded investment	0	0
Commercial | Loans and Finance Receivables, Traditional Loans | Commercial real estate | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Total recorded investment	0	0
Commercial | Loans and Finance Receivables, Traditional Loans | Commercial real estate | Total Past Due
Financing Receivable, Past Due [Line Items]
Total recorded investment	0	0
Commercial | Loans and Finance Receivables, Traditional Loans | Commercial real estate | Current
Financing Receivable, Past Due [Line Items]
Total recorded investment	1,311,105	807,195
Commercial | Loans and Finance Receivables, Traditional Loans | Multifamily
Financing Receivable, Past Due [Line Items]
Total recorded investment	1,361,054	1,289,820
Commercial | Loans and Finance Receivables, Traditional Loans | Multifamily | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total recorded investment	786	0
Commercial | Loans and Finance Receivables, Traditional Loans | Multifamily | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total recorded investment	0	0
Commercial | Loans and Finance Receivables, Traditional Loans | Multifamily | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Total recorded investment	0	0
Commercial | Loans and Finance Receivables, Traditional Loans | Multifamily | Total Past Due
Financing Receivable, Past Due [Line Items]
Total recorded investment	786	0
Commercial | Loans and Finance Receivables, Traditional Loans | Multifamily | Current
Financing Receivable, Past Due [Line Items]
Total recorded investment	1,360,268	1,289,820
Commercial | Loans and Finance Receivables, Traditional Loans | SBA
Financing Receivable, Past Due [Line Items]
Total recorded investment	205,548	273,444
Commercial | Loans and Finance Receivables, Traditional Loans | SBA | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total recorded investment	987	354
Commercial | Loans and Finance Receivables, Traditional Loans | SBA | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total recorded investment	2,360	626
Commercial | Loans and Finance Receivables, Traditional Loans | SBA | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Total recorded investment	15,941	3,062
Commercial | Loans and Finance Receivables, Traditional Loans | SBA | Total Past Due
Financing Receivable, Past Due [Line Items]
Total recorded investment	19,288	4,042
Commercial | Loans and Finance Receivables, Traditional Loans | SBA | Current
Financing Receivable, Past Due [Line Items]
Total recorded investment	186,260	269,402
Commercial | Loans and Finance Receivables, Traditional Loans | Construction
Financing Receivable, Past Due [Line Items]
Total recorded investment	181,841	176,016
Commercial | Loans and Finance Receivables, Traditional Loans | Construction | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total recorded investment	0	0
Commercial | Loans and Finance Receivables, Traditional Loans | Construction | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total recorded investment	0	0
Commercial | Loans and Finance Receivables, Traditional Loans | Construction | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Total recorded investment	0	0
Commercial | Loans and Finance Receivables, Traditional Loans | Construction | Total Past Due
Financing Receivable, Past Due [Line Items]
Total recorded investment	0	0
Commercial | Loans and Finance Receivables, Traditional Loans | Construction | Current
Financing Receivable, Past Due [Line Items]
Total recorded investment	181,841	176,016
Consumer
Financing Receivable, Past Due [Line Items]
Total recorded investment	7,251,480
Consumer | Single family residential mortgage
Financing Receivable, Past Due [Line Items]
Total recorded investment	1,420,023	1,230,236
Consumer | Other consumer
Financing Receivable, Past Due [Line Items]
Total recorded investment	102,925	33,386
Consumer | Loans and Finance Receivables, Traditional Loans | Single family residential mortgage
Financing Receivable, Past Due [Line Items]
Total recorded investment	1,420,023	1,230,236
Consumer | Loans and Finance Receivables, Traditional Loans | Single family residential mortgage | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total recorded investment	24,867	11,036
Consumer | Loans and Finance Receivables, Traditional Loans | Single family residential mortgage | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total recorded investment	0	1,621
Consumer | Loans and Finance Receivables, Traditional Loans | Single family residential mortgage | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Total recorded investment	7,076	10,290
Consumer | Loans and Finance Receivables, Traditional Loans | Single family residential mortgage | Total Past Due
Financing Receivable, Past Due [Line Items]
Total recorded investment	31,943	22,947
Consumer | Loans and Finance Receivables, Traditional Loans | Single family residential mortgage | Current
Financing Receivable, Past Due [Line Items]
Total recorded investment	1,388,080	1,207,289
Consumer | Loans and Finance Receivables, Traditional Loans | Other consumer
Financing Receivable, Past Due [Line Items]
Total recorded investment	102,925	33,386
Consumer | Loans and Finance Receivables, Traditional Loans | Other consumer | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total recorded investment	449	216
Consumer | Loans and Finance Receivables, Traditional Loans | Other consumer | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total recorded investment	0	61
Consumer | Loans and Finance Receivables, Traditional Loans | Other consumer | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Total recorded investment	89	0
Consumer | Loans and Finance Receivables, Traditional Loans | Other consumer | Total Past Due
Financing Receivable, Past Due [Line Items]
Total recorded investment	538	277
Consumer | Loans and Finance Receivables, Traditional Loans | Other consumer | Current
Financing Receivable, Past Due [Line Items]
Total recorded investment	$ 102,387	$ 33,109

X

- Definition

Amount excluding accrued interest, before allowance for credit loss, of financing receivable.

+ 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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No definition available.

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