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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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