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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Aging of Recorded Investment in Past Due Loans and Leases (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | $ 31,617 | $ 57,607
Current | 5,866,788 | 5,894,278
Total | 5,898,405 | 5,951,885
30 - 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 11,673 | 19,290
60 - 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 2,308 | 13,583
Greater than 89 Days Past due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 17,636 | 24,734
NTM Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 437,113 | 600,656
Traditional Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 20,228 | 37,080
Current | 5,441,064 | 5,314,149
Total | 5,461,292 | 5,351,229
Traditional Loans | 30 - 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 7,473 | 15,317
Traditional Loans | 60 - 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 1,667 | 10,048
Traditional Loans | Greater than 89 Days Past due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 11,088 | 11,715
Consumer | Single family residential mortgage |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 1,230,236 | 1,590,774
Consumer | Other consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 33,386 | 54,165
Consumer | NTM Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 11,389 | 20,527
Current | 425,724 | 580,129
Total | 437,113 | 600,656
Consumer | NTM Loans | 30 - 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 4,200 | 3,973
Consumer | NTM Loans | 60 - 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 641 | 3,535
Consumer | NTM Loans | Greater than 89 Days Past due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 6,548 | 13,019
Consumer | NTM Loans | Single family residential mortgage |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 11,389 | 20,527
Current | 424,126 | 577,830
Total | 435,515 | 598,357
Consumer | NTM Loans | Single family residential mortgage | 30 - 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 4,200 | 3,973
Consumer | NTM Loans | Single family residential mortgage | 60 - 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 641 | 3,535
Consumer | NTM Loans | Single family residential mortgage | Greater than 89 Days Past due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 6,548 | 13,019
Consumer | NTM Loans | Other consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 0 | 0
Current | 1,598 | 2,299
Total | 1,598 | 2,299
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 | 11,558 | 22,854
Current | 783,163 | 969,563
Total | 794,721 | 992,417
Consumer | Traditional Loans | Single family residential mortgage | 30 - 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 6,836 | 13,752
Consumer | Traditional Loans | Single family residential mortgage | 60 - 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 980 | 3,496
Consumer | Traditional Loans | Single family residential mortgage | Greater than 89 Days Past due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 3,742 | 5,606
Consumer | Traditional Loans | Other consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 277 | 334
Current | 31,511 | 51,532
Total | 31,788 | 51,866
Consumer | Traditional Loans | Other consumer | 30 - 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 216 | 199
Consumer | Traditional Loans | Other consumer | 60 - 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 61 | 40
Consumer | Traditional Loans | Other consumer | Greater than 89 Days Past due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 0 | 95
Commercial | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 2,088,308 | 1,691,270
Commercial | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 807,195 | 818,817
Commercial | Multifamily |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 1,289,820 | 1,494,528
Commercial | SBA |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 273,444 | 70,981
Commercial | Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 176,016 | 231,350
Commercial | NTM Loans | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 0 | 0
Commercial | NTM Loans | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 0 | 0
Commercial | NTM Loans | Multifamily |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 0 | 0
Commercial | NTM Loans | SBA |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 0 | 0
Commercial | NTM Loans | Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 0 | 0
Commercial | Traditional Loans | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 4,351 | 10,312
Current | 2,083,957 | 1,680,958
Total | 2,088,308 | 1,691,270
Commercial | Traditional Loans | Commercial and industrial | 30 - 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 67 | 780
Commercial | Traditional Loans | Commercial and industrial | 60 - 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 0 | 5,670
Commercial | Traditional Loans | Commercial and industrial | Greater than 89 Days Past due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 4,284 | 3,862
Commercial | Traditional Loans | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 0 | 0
Current | 807,195 | 818,817
Total | 807,195 | 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 | 0 | 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 | 1,289,820 | 1,494,528
Total | 1,289,820 | 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 | 4,042 | 3,580
Current | 269,402 | 67,401
Total | 273,444 | 70,981
Commercial | Traditional Loans | SBA | 30 - 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 354 | 586
Commercial | Traditional Loans | SBA | 60 - 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 626 | 842
Commercial | Traditional Loans | SBA | Greater than 89 Days Past due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 3,062 | 2,152
Commercial | Traditional Loans | Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 0 | 0
Current | 176,016 | 231,350
Total | 176,016 | 231,350
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 | 0
Commercial | Traditional Loans | Construction | Greater than 89 Days Past due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | $ 0 | $ 0

X
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