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LOANS AND ALLOWANCE FOR LOAN LOSSES - Risk Categories for Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	$ 5,951,885	$ 7,700,873
Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	5,782,383	7,543,176
Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	67,531	76,945
Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	99,836	79,898
Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,135	854
NTM Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	600,656	826,731
Traditional Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	5,351,229	6,874,142
Traditional Loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	5,200,536	6,729,707
Traditional Loans | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	61,741	65,979
Traditional Loans | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	86,817	77,602
Traditional Loans | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,135	854
Consumer | Single family residential mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,590,774	2,305,490
Consumer | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	54,165	70,265
Consumer | NTM Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	600,656	826,731
Consumer | NTM Loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	581,847	813,469
Consumer | NTM Loans | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	5,790	10,966
Consumer | NTM Loans | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	13,019	2,296
Consumer | NTM Loans | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0	0
Consumer | NTM Loans | Single family residential mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	598,357	824,318
Consumer | NTM Loans | Single family residential mortgage | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	579,548	811,056
Consumer | NTM Loans | Single family residential mortgage | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	5,790	10,966
Consumer | NTM Loans | Single family residential mortgage | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	13,019	2,296
Consumer | NTM Loans | Single family residential mortgage | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0	0
Consumer | NTM Loans | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,299	2,413
Consumer | NTM Loans | Other consumer | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,299	2,413
Consumer | NTM Loans | Other consumer | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0	0
Consumer | NTM Loans | Other consumer | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0	0
Consumer | NTM Loans | Other consumer | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0	0
Consumer | Traditional Loans | Single family residential mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	992,417	1,481,172
Consumer | Traditional Loans | Single family residential mortgage | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	979,705	1,461,721
Consumer | Traditional Loans | Single family residential mortgage | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	4,945	2,602
Consumer | Traditional Loans | Single family residential mortgage | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	7,250	16,849
Consumer | Traditional Loans | Single family residential mortgage | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	517	0
Consumer | Traditional Loans | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	51,866	67,852
Consumer | Traditional Loans | Other consumer | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	51,032	66,228
Consumer | Traditional Loans | Other consumer | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	346	979
Consumer | Traditional Loans | Other consumer | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	488	645
Consumer | Traditional Loans | Other consumer | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0	0
Commercial | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,691,270	1,944,142
Commercial | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	818,817	867,013
Commercial | Multifamily
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,494,528	2,241,246
Commercial | SBA
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	70,981	68,741
Commercial | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	231,350	203,976
Commercial | NTM Loans | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0	0
Commercial | NTM Loans | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0	0
Commercial | NTM Loans | Multifamily
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0	0
Commercial | NTM Loans | SBA
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0	0
Commercial | NTM Loans | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0	0
Commercial | Traditional Loans | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,691,270	1,944,142
Commercial | Traditional Loans | Commercial and industrial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,580,269	1,859,569
Commercial | Traditional Loans | Commercial and industrial | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	45,323	41,302
Commercial | Traditional Loans | Commercial and industrial | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	65,678	43,271
Commercial | Traditional Loans | Commercial and industrial | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0	0
Commercial | Traditional Loans | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	818,817	867,013
Commercial | Traditional Loans | Commercial real estate | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	813,846	851,604
Commercial | Traditional Loans | Commercial real estate | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,532	11,376
Commercial | Traditional Loans | Commercial real estate | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,439	4,033
Commercial | Traditional Loans | Commercial real estate | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0	0
Commercial | Traditional Loans | Multifamily
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,494,528	2,241,246
Commercial | Traditional Loans | Multifamily | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,484,931	2,239,301
Commercial | Traditional Loans | Multifamily | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	4,256	0
Commercial | Traditional Loans | Multifamily | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	5,341	1,945
Commercial | Traditional Loans | Multifamily | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0	0
Commercial | Traditional Loans | SBA
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	70,981	68,741
Commercial | Traditional Loans | SBA | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	60,982	53,433
Commercial | Traditional Loans | SBA | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,760	6,114
Commercial | Traditional Loans | SBA | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	5,621	8,340
Commercial | Traditional Loans | SBA | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,618	854
Commercial | Traditional Loans | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	231,350	203,976
Commercial | Traditional Loans | Construction | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	229,771	197,851
Commercial | Traditional Loans | Construction | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,579	3,606
Commercial | Traditional Loans | Construction | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0	2,519
Commercial | Traditional Loans | Construction | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	$ 0	$ 0

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Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=118952595&loc=d3e4428-111522

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-Publisher FASB
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