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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Aging of Recorded Investment in Past Due Loans (Detail) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2019
--- | --- | --- | ---
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | $ 84,970 | $ 57,607 |
Current | 5,582,494 | 5,894,278 |
Total | 5,667,464 | 5,951,885 | $ 7,557,200
30 - 59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 45,182 | 19,290 |
60 - 89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 11,156 | 13,583 |
Greater than 89 Days Past due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 28,632 | 24,734 |
Traditional Loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 56,967 | 37,080 |
Current | 5,050,439 | 5,314,149 |
Total | 5,107,406 | 5,351,229 |
Traditional Loans | 30 - 59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 37,139 | 15,317 |
Traditional Loans | 60 - 89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 5,773 | 10,048 |
Traditional Loans | Greater than 89 Days Past due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 14,055 | 11,715 |
Consumer | Single family residential mortgage |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total | 1,467,375 | 1,590,774 |
Consumer | Other consumer |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total | 47,229 | 54,165 |
Consumer | Non-Traditional Mortgage (NTM) loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 28,003 | 20,527 |
Current | 532,055 | 580,129 |
Total | 560,058 | 600,656 |
Consumer | Non-Traditional Mortgage (NTM) loans | 30 - 59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 8,043 | 3,973 |
Consumer | Non-Traditional Mortgage (NTM) loans | 60 - 89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 5,383 | 3,535 |
Consumer | Non-Traditional Mortgage (NTM) loans | Greater than 89 Days Past due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 14,577 | 13,019 |
Consumer | Non-Traditional Mortgage (NTM) loans | Single family residential mortgage |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 28,003 | 20,527 |
Current | 530,161 | 577,830 |
Total | 558,164 | 598,357 |
Consumer | Non-Traditional Mortgage (NTM) loans | Single family residential mortgage | 30 - 59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 8,043 | 3,973 |
Consumer | Non-Traditional Mortgage (NTM) loans | Single family residential mortgage | 60 - 89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 5,383 | 3,535 |
Consumer | Non-Traditional Mortgage (NTM) loans | Single family residential mortgage | Greater than 89 Days Past due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 14,577 | 13,019 |
Consumer | Non-Traditional Mortgage (NTM) loans | Other consumer |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 0 | 0 |
Current | 1,894 | 2,299 |
Total | 1,894 | 2,299 |
Consumer | Non-Traditional Mortgage (NTM) loans | Other consumer | 30 - 59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 0 | 0 |
Consumer | Non-Traditional Mortgage (NTM) loans | Other consumer | 60 - 89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 0 | 0 |
Consumer | Non-Traditional Mortgage (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 | 43,364 | 22,854 |
Current | 865,847 | 969,563 |
Total | 909,211 | 992,417 |
Consumer | Traditional Loans | Single family residential mortgage | 30 - 59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 32,993 | 13,752 |
Consumer | Traditional Loans | Single family residential mortgage | 60 - 89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 1,600 | 3,496 |
Consumer | Traditional Loans | Single family residential mortgage | Greater than 89 Days Past due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 8,771 | 5,606 |
Consumer | Traditional Loans | Other consumer |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 794 | 334 |
Current | 44,541 | 51,532 |
Total | 45,335 | 51,866 |
Consumer | Traditional Loans | Other consumer | 30 - 59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 754 | 199 |
Consumer | Traditional Loans | Other consumer | 60 - 89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 0 | 40 |
Consumer | Traditional Loans | Other consumer | Greater than 89 Days Past due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 40 | 95 |
Commercial | Commercial and industrial |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total | 1,578,223 | 1,691,270 | 1,907,102
Commercial | Commercial real estate |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total | 810,024 | 818,817 | 865,521
Commercial | Multifamily |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total | 1,466,083 | 1,494,528 | 2,332,527
Commercial | SBA |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total | 70,583 | 70,981 | 74,998
Commercial | Construction |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total | 227,947 | 231,350 | $ 211,549
Commercial | Traditional Loans | Commercial and industrial |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 6,937 | 10,312 |
Current | 1,571,286 | 1,680,958 |
Total | 1,578,223 | 1,691,270 |
Commercial | Traditional Loans | Commercial and industrial | 30 - 59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 649 | 780 |
Commercial | Traditional Loans | Commercial and industrial | 60 - 89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 3,687 | 5,670 |
Commercial | Traditional Loans | Commercial and industrial | Greater than 89 Days Past due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 2,601 | 3,862 |
Commercial | Traditional Loans | Commercial real estate |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 264 | 0 |
Current | 809,760 | 818,817 |
Total | 810,024 | 818,817 |
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 | 264 | 0 |
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 | 0 |
Current | 1,466,083 | 1,494,528 |
Total | 1,466,083 | 1,494,528 |
Commercial | Traditional Loans | Multifamily | 30 - 59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 0 | 0 |
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 | 4,874 | 3,580 |
Current | 65,709 | 67,401 |
Total | 70,583 | 70,981 |
Commercial | Traditional Loans | SBA | 30 - 59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 2,009 | 586 |
Commercial | Traditional Loans | SBA | 60 - 89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 222 | 842 |
Commercial | Traditional Loans | SBA | Greater than 89 Days Past due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 2,643 | 2,152 |
Commercial | Traditional Loans | Construction |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 734 | 0 |
Current | 227,213 | 231,350 |
Total | 227,947 | 231,350 |
Commercial | Traditional Loans | Construction | 30 - 59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 734 | 0 |
Commercial | Traditional Loans | Construction | 60 - 89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 0 | 0 |
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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