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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Aging of Recorded Investment in Past Due Loans (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Financing Receivable, Past Due [Line Items]
Loans receivable	$ 5,985,477	$ 5,898,405
Current
Financing Receivable, Past Due [Line Items]
Loans receivable	5,950,496	5,866,788
Total Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	34,981	31,617
30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	15,373	11,673
60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	1,610	2,308
Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Loans receivable	17,998	17,636
Traditional Loans
Financing Receivable, Past Due [Line Items]
Loans receivable	5,522,902	5,461,292
Traditional Loans | Current
Financing Receivable, Past Due [Line Items]
Loans receivable	5,497,781	5,441,064
Traditional Loans | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	25,121	20,228
Traditional Loans | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	8,182	7,473
Traditional Loans | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	1,610	1,667
Traditional Loans | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Loans receivable	15,329	11,088
Consumer | Single family residential mortgage
Financing Receivable, Past Due [Line Items]
Loans receivable	1,288,176	1,230,236
Consumer | Other consumer
Financing Receivable, Past Due [Line Items]
Loans receivable	24,350	33,386
Consumer | Non-Traditional Mortgage (NTM) loans
Financing Receivable, Past Due [Line Items]
Loans receivable	462,575	437,113
Consumer | Non-Traditional Mortgage (NTM) loans | Current
Financing Receivable, Past Due [Line Items]
Loans receivable	452,715	425,724
Consumer | Non-Traditional Mortgage (NTM) loans | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	9,860	11,389
Consumer | Non-Traditional Mortgage (NTM) loans | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	7,191	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	2,669	6,548
Consumer | Non-Traditional Mortgage (NTM) loans | Single family residential mortgage
Financing Receivable, Past Due [Line Items]
Loans receivable	460,974	435,515
Consumer | Non-Traditional Mortgage (NTM) loans | Single family residential mortgage | Current
Financing Receivable, Past Due [Line Items]
Loans receivable	451,114	424,126
Consumer | Non-Traditional Mortgage (NTM) loans | Single family residential mortgage | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	9,860	11,389
Consumer | Non-Traditional Mortgage (NTM) loans | Single family residential mortgage | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	7,191	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	2,669	6,548
Consumer | Non-Traditional Mortgage (NTM) loans | Other consumer
Financing Receivable, Past Due [Line Items]
Loans receivable	1,601	1,598
Consumer | Non-Traditional Mortgage (NTM) loans | Other consumer | Current
Financing Receivable, Past Due [Line Items]
Loans receivable	1,601	1,598
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 | 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 | Traditional Loans | Single family residential mortgage
Financing Receivable, Past Due [Line Items]
Loans receivable	827,202	794,721
Consumer | Traditional Loans | Single family residential mortgage | Current
Financing Receivable, Past Due [Line Items]
Loans receivable	815,363	783,163
Consumer | Traditional Loans | Single family residential mortgage | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	11,839	11,558
Consumer | Traditional Loans | Single family residential mortgage | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	6,497	6,836
Consumer | Traditional Loans | Single family residential mortgage | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	1,023	980
Consumer | Traditional Loans | Single family residential mortgage | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Loans receivable	4,319	3,742
Consumer | Traditional Loans | Other consumer
Financing Receivable, Past Due [Line Items]
Loans receivable	22,749	31,788
Consumer | Traditional Loans | Other consumer | Current
Financing Receivable, Past Due [Line Items]
Loans receivable	22,749	31,511
Consumer | Traditional Loans | Other consumer | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	0	277
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
Commercial | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Loans receivable	2,070,910	2,088,308
Commercial | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans receivable	871,790	807,195
Commercial | Multifamily
Financing Receivable, Past Due [Line Items]
Loans receivable	1,325,770	1,289,820
Commercial | SBA
Financing Receivable, Past Due [Line Items]
Loans receivable	253,924	273,444
Commercial | Construction
Financing Receivable, Past Due [Line Items]
Loans receivable	150,557	176,016
Commercial | Traditional Loans | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Loans receivable	2,070,910	2,088,308
Commercial | Traditional Loans | Commercial and industrial | Current
Financing Receivable, Past Due [Line Items]
Loans receivable	2,067,157	2,083,957
Commercial | Traditional Loans | Commercial and industrial | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	3,753	4,351
Commercial | Traditional Loans | Commercial and industrial | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	9	67
Commercial | Traditional Loans | Commercial and industrial | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	587	0
Commercial | Traditional Loans | Commercial and industrial | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Loans receivable	3,157	4,284
Commercial | Traditional Loans | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans receivable	871,790	807,195
Commercial | Traditional Loans | Commercial real estate | Current
Financing Receivable, Past Due [Line Items]
Loans receivable	870,879	807,195
Commercial | Traditional Loans | Commercial real estate | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	911	0
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	911	0
Commercial | Traditional Loans | Multifamily
Financing Receivable, Past Due [Line Items]
Loans receivable	1,325,770	1,289,820
Commercial | Traditional Loans | Multifamily | Current
Financing Receivable, Past Due [Line Items]
Loans receivable	1,324,974	1,289,820
Commercial | Traditional Loans | Multifamily | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	796	0
Commercial | Traditional Loans | Multifamily | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	796	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 | SBA
Financing Receivable, Past Due [Line Items]
Loans receivable	253,924	273,444
Commercial | Traditional Loans | SBA | Current
Financing Receivable, Past Due [Line Items]
Loans receivable	246,102	269,402
Commercial | Traditional Loans | SBA | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	7,822	4,042
Commercial | Traditional Loans | SBA | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	880	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	6,942	3,062
Commercial | Traditional Loans | Construction
Financing Receivable, Past Due [Line Items]
Loans receivable	150,557	176,016
Commercial | Traditional Loans | Construction | Current
Financing Receivable, Past Due [Line Items]
Loans receivable	150,557	176,016
Commercial | Traditional Loans | Construction | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	0	0
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

X

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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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