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LOANS AND ALLOWANCE FOR LOAN LOSSES - Aging of Recorded Investment in Past Due Loans and Leases (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Past Due [Line Items]
Total Past Due	$ 57,607	$ 40,530
Current	5,894,278	7,660,343
Total ending loan balances	5,951,885	7,700,873
30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	19,290	19,140
60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	13,583	7,544
Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Total Past Due	24,734	13,846
NTM Loans
Financing Receivable, Past Due [Line Items]
Total ending loan balances	600,656	826,731
Traditional Loans
Financing Receivable, Past Due [Line Items]
Total Past Due	37,080	32,483
Current	5,314,149	6,841,659
Total ending loan balances	5,351,229	6,874,142
Traditional Loans | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	15,317	11,710
Traditional Loans | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	10,048	6,927
Traditional Loans | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Total Past Due	11,715	13,846
Consumer | Single family residential mortgage
Financing Receivable, Past Due [Line Items]
Total ending loan balances	1,590,774	2,305,490
Consumer | Other consumer
Financing Receivable, Past Due [Line Items]
Total ending loan balances	54,165	70,265
Consumer | NTM Loans
Financing Receivable, Past Due [Line Items]
Total Past Due	20,527	8,047
Current	580,129	818,684
Total ending loan balances	600,656	826,731
Consumer | NTM Loans | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	3,973	7,430
Consumer | NTM Loans | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	3,535	617
Consumer | NTM Loans | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Total Past Due	13,019	0
Consumer | NTM Loans | Single family residential mortgage
Financing Receivable, Past Due [Line Items]
Total Past Due	20,527	8,047
Current	577,830	816,271
Total ending loan balances	598,357	824,318
Consumer | NTM Loans | Single family residential mortgage | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	3,973	7,430
Consumer | NTM Loans | Single family residential mortgage | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	3,535	617
Consumer | NTM Loans | Single family residential mortgage | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Total Past Due	13,019	0
Consumer | NTM Loans | Other consumer
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Current	2,299	2,413
Total ending loan balances	2,299	2,413
Consumer | NTM Loans | Other consumer | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Consumer | NTM Loans | Other consumer | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Consumer | NTM Loans | Other consumer | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Consumer | Traditional Loans | Single family residential mortgage
Financing Receivable, Past Due [Line Items]
Total Past Due	22,854	19,679
Current	969,563	1,461,493
Total ending loan balances	992,417	1,481,172
Consumer | Traditional Loans | Single family residential mortgage | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	13,752	7,321
Consumer | Traditional Loans | Single family residential mortgage | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	3,496	3,160
Consumer | Traditional Loans | Single family residential mortgage | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Total Past Due	5,606	9,198
Consumer | Traditional Loans | Other consumer
Financing Receivable, Past Due [Line Items]
Total Past Due	334	4,151
Current	51,532	63,701
Total ending loan balances	51,866	67,852
Consumer | Traditional Loans | Other consumer | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	199	3,132
Consumer | Traditional Loans | Other consumer | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	40	573
Consumer | Traditional Loans | Other consumer | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Total Past Due	95	446
Commercial | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total ending loan balances	1,691,270	1,944,142
Commercial | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total ending loan balances	818,817	867,013
Commercial | Multifamily
Financing Receivable, Past Due [Line Items]
Total ending loan balances	1,494,528	2,241,246
Commercial | SBA
Financing Receivable, Past Due [Line Items]
Total ending loan balances	70,981	68,741
Commercial | Construction
Financing Receivable, Past Due [Line Items]
Total ending loan balances	231,350	203,976
Commercial | NTM Loans | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total ending loan balances	0	0
Commercial | NTM Loans | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total ending loan balances	0	0
Commercial | NTM Loans | Multifamily
Financing Receivable, Past Due [Line Items]
Total ending loan balances	0	0
Commercial | NTM Loans | SBA
Financing Receivable, Past Due [Line Items]
Total ending loan balances	0	0
Commercial | NTM Loans | Construction
Financing Receivable, Past Due [Line Items]
Total ending loan balances	0	0
Commercial | Traditional Loans | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total Past Due	10,312	5,286
Current	1,680,958	1,938,856
Total ending loan balances	1,691,270	1,944,142
Commercial | Traditional Loans | Commercial and industrial | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	780	350
Commercial | Traditional Loans | Commercial and industrial | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	5,670	1,596
Commercial | Traditional Loans | Commercial and industrial | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Total Past Due	3,862	3,340
Commercial | Traditional Loans | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total Past Due	0	582
Current	818,817	866,431
Total ending loan balances	818,817	867,013
Commercial | Traditional Loans | Commercial real estate | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Commercial | Traditional Loans | Commercial real estate | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	0	582
Commercial | Traditional Loans | Commercial real estate | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Commercial | Traditional Loans | Multifamily
Financing Receivable, Past Due [Line Items]
Total Past Due	0	356
Current	1,494,528	2,240,890
Total ending loan balances	1,494,528	2,241,246
Commercial | Traditional Loans | Multifamily | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	0	356
Commercial | Traditional Loans | Multifamily | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Commercial | Traditional Loans | Multifamily | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Commercial | Traditional Loans | SBA
Financing Receivable, Past Due [Line Items]
Total Past Due	3,580	1,490
Current	67,401	67,251
Total ending loan balances	70,981	68,741
Commercial | Traditional Loans | SBA | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	586	551
Commercial | Traditional Loans | SBA | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	842	77
Commercial | Traditional Loans | SBA | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Total Past Due	2,152	862
Commercial | Traditional Loans | Construction
Financing Receivable, Past Due [Line Items]
Total Past Due	0	939
Current	231,350	203,037
Total ending loan balances	231,350	203,976
Commercial | Traditional Loans | Construction | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Commercial | Traditional Loans | Construction | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	0	939
Commercial | Traditional Loans | Construction | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Total Past Due	$ 0	$ 0

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Amount of financing receivable not past due.

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