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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Aging of Recorded Investment in Past Due Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Financing Receivable, Past Due [Line Items]
Loans receivable	$ 6,228,575	$ 5,898,405
30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	18,332	11,673
60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	4,812	2,308
Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Loans receivable	21,979	17,636
Total Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	45,123	31,617
Current
Financing Receivable, Past Due [Line Items]
Loans receivable	6,183,452	5,866,788
Traditional Loans
Financing Receivable, Past Due [Line Items]
Loans receivable	5,657,197	5,461,292
Traditional Loans | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	11,234	7,473
Traditional Loans | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	4,812	1,667
Traditional Loans | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Loans receivable	19,572	11,088
Traditional Loans | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	35,618	20,228
Traditional Loans | Current
Financing Receivable, Past Due [Line Items]
Loans receivable	5,621,579	5,441,064
Consumer | Single family residential mortgage
Financing Receivable, Past Due [Line Items]
Loans receivable	1,393,696	1,230,236
Consumer | Other consumer
Financing Receivable, Past Due [Line Items]
Loans receivable	23,298	33,386
Consumer | Non-traditional Mortgage (NTM) Loans
Financing Receivable, Past Due [Line Items]
Loans receivable	571,378	437,113
Consumer | Non-traditional Mortgage (NTM) Loans | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	7,098	4,200
Consumer | Non-traditional Mortgage (NTM) Loans | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	0	641
Consumer | Non-traditional Mortgage (NTM) Loans | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Loans receivable	2,407	6,548
Consumer | Non-traditional Mortgage (NTM) Loans | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	9,505	11,389
Consumer | Non-traditional Mortgage (NTM) Loans | Current
Financing Receivable, Past Due [Line Items]
Loans receivable	561,873	425,724
Consumer | Non-traditional Mortgage (NTM) Loans | Single family residential mortgage
Financing Receivable, Past Due [Line Items]
Loans receivable	569,781	435,515
Consumer | Non-traditional Mortgage (NTM) Loans | Single family residential mortgage | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	7,098	4,200
Consumer | Non-traditional Mortgage (NTM) Loans | Single family residential mortgage | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	0	641
Consumer | Non-traditional Mortgage (NTM) Loans | Single family residential mortgage | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Loans receivable	2,407	6,548
Consumer | Non-traditional Mortgage (NTM) Loans | Single family residential mortgage | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	9,505	11,389
Consumer | Non-traditional Mortgage (NTM) Loans | Single family residential mortgage | Current
Financing Receivable, Past Due [Line Items]
Loans receivable	560,276	424,126
Consumer | Non-traditional Mortgage (NTM) Loans | Other consumer
Financing Receivable, Past Due [Line Items]
Loans receivable	1,597	1,598
Consumer | Non-traditional Mortgage (NTM) Loans | Other consumer | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	0	0
Consumer | Non-traditional Mortgage (NTM) Loans | Other consumer | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	0	0
Consumer | Non-traditional Mortgage (NTM) Loans | Other consumer | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Loans receivable	0	0
Consumer | Non-traditional Mortgage (NTM) Loans | Other consumer | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	0	0
Consumer | Non-traditional Mortgage (NTM) Loans | Other consumer | Current
Financing Receivable, Past Due [Line Items]
Loans receivable	1,597	1,598
Consumer | Traditional Loans | Single family residential mortgage
Financing Receivable, Past Due [Line Items]
Loans receivable	823,915	794,721
Consumer | Traditional Loans | Single family residential mortgage | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	4,274	6,836
Consumer | Traditional Loans | Single family residential mortgage | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	1,016	980
Consumer | Traditional Loans | Single family residential mortgage | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Loans receivable	4,311	3,742
Consumer | Traditional Loans | Single family residential mortgage | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	9,601	11,558
Consumer | Traditional Loans | Single family residential mortgage | Current
Financing Receivable, Past Due [Line Items]
Loans receivable	814,314	783,163
Consumer | Traditional Loans | Other consumer
Financing Receivable, Past Due [Line Items]
Loans receivable	21,701	31,788
Consumer | Traditional Loans | Other consumer | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	0	216
Consumer | Traditional Loans | Other consumer | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	0	61
Consumer | Traditional Loans | Other consumer | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Loans receivable	0	0
Consumer | Traditional Loans | Other consumer | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	0	277
Consumer | Traditional Loans | Other consumer | Current
Financing Receivable, Past Due [Line Items]
Loans receivable	21,701	31,511
Commercial | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Loans receivable	2,296,626	2,088,308
Commercial | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans receivable	907,224	807,195
Commercial | Multifamily
Financing Receivable, Past Due [Line Items]
Loans receivable	1,295,613	1,289,820
Commercial | SBA
Financing Receivable, Past Due [Line Items]
Loans receivable	181,582	273,444
Commercial | Construction
Financing Receivable, Past Due [Line Items]
Loans receivable	130,536	176,016
Commercial | Traditional Loans | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Loans receivable	2,296,626	2,088,308
Commercial | Traditional Loans | Commercial and industrial | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	3,624	67
Commercial | Traditional Loans | Commercial and industrial | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	3,796	0
Commercial | Traditional Loans | Commercial and industrial | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Loans receivable	2,876	4,284
Commercial | Traditional Loans | Commercial and industrial | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	10,296	4,351
Commercial | Traditional Loans | Commercial and industrial | Current
Financing Receivable, Past Due [Line Items]
Loans receivable	2,286,330	2,083,957
Commercial | Traditional Loans | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans receivable	907,224	807,195
Commercial | Traditional Loans | Commercial real estate | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	0	0
Commercial | Traditional Loans | Commercial real estate | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	0	0
Commercial | Traditional Loans | Commercial real estate | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Loans receivable	0	0
Commercial | Traditional Loans | Commercial real estate | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	0	0
Commercial | Traditional Loans | Commercial real estate | Current
Financing Receivable, Past Due [Line Items]
Loans receivable	907,224	807,195
Commercial | Traditional Loans | Multifamily
Financing Receivable, Past Due [Line Items]
Loans receivable	1,295,613	1,289,820
Commercial | Traditional Loans | Multifamily | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	791	0
Commercial | Traditional Loans | Multifamily | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	0	0
Commercial | Traditional Loans | Multifamily | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Loans receivable	0	0
Commercial | Traditional Loans | Multifamily | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	791	0
Commercial | Traditional Loans | Multifamily | Current
Financing Receivable, Past Due [Line Items]
Loans receivable	1,294,822	1,289,820
Commercial | Traditional Loans | SBA
Financing Receivable, Past Due [Line Items]
Loans receivable	181,582	273,444
Commercial | Traditional Loans | SBA | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	2,545	354
Commercial | Traditional Loans | SBA | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	0	626
Commercial | Traditional Loans | SBA | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Loans receivable	12,385	3,062
Commercial | Traditional Loans | SBA | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	14,930	4,042
Commercial | Traditional Loans | SBA | Current
Financing Receivable, Past Due [Line Items]
Loans receivable	166,652	269,402
Commercial | Traditional Loans | Construction
Financing Receivable, Past Due [Line Items]
Loans receivable	130,536	176,016
Commercial | Traditional Loans | Construction | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	0	0
Commercial | Traditional Loans | Construction | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	0	0
Commercial | Traditional Loans | Construction | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Loans receivable	0	0
Commercial | Traditional Loans | Construction | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	0	0
Commercial | Traditional Loans | Construction | Current
Financing Receivable, Past Due [Line Items]
Loans receivable	$ 130,536	$ 176,016

X

- Definition

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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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