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LOANS AND ALLOWANCE FOR LOAN LOSSES - Aging of Recorded Investment in Past Due Loans and Leases (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2018
--- | --- | --- | ---
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | $ 56,342 | $ 40,530 |
Current | 6,326,917 | 7,660,343 |
Total ending loan balances | 6,383,259 | 7,700,873 | $ 7,253,293
30 - 59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 23,520 | 19,140 |
60 - 89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 15,602 | 7,544 |
Greater than 89 Days Past due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 17,220 | 13,846 |
NTM Loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total ending loan balances | 6,383,259 | 7,700,873 |
Traditional Loans and Leases |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 34,582 | 32,483 |
Current | 5,695,202 | 6,841,659 |
Total ending loan balances | 5,729,784 | 6,874,142 |
Traditional Loans and Leases | 30 - 59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 13,699 | 11,710 |
Traditional Loans and Leases | 60 - 89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 4,490 | 6,927 |
Traditional Loans and Leases | Greater than 89 Days Past due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 16,393 | 13,846 |
Traditional Loans and Leases | Construction |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total ending loan balances | 228,561 | 203,976 |
Consumer | Single family residential mortgage |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total ending loan balances | 1,775,953 | 2,305,490 |
Consumer | Other consumer |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total ending loan balances | 59,122 | 70,265 |
Consumer | NTM Loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 21,760 | 8,047 |
Current | 631,715 | 818,684 |
Total ending loan balances | 653,475 | 826,731 |
Consumer | NTM Loans | 30 - 59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 9,821 | 7,430 |
Consumer | NTM Loans | 60 - 89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 11,112 | 617 |
Consumer | NTM Loans | Greater than 89 Days Past due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 827 | 0 |
Consumer | NTM Loans | Single family residential mortgage |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 21,760 | 8,047 |
Current | 629,407 | 816,271 |
Total ending loan balances | 651,167 | 824,318 |
Consumer | NTM Loans | Single family residential mortgage | 30 - 59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 9,821 | 7,430 |
Consumer | NTM Loans | Single family residential mortgage | 60 - 89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 11,112 | 617 |
Consumer | NTM Loans | Single family residential mortgage | Greater than 89 Days Past due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 827 | 0 |
Consumer | NTM Loans | Other consumer |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 0 | 0 |
Current | 2,308 | 2,413 |
Total ending loan balances | 2,308 | 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 and Leases | Single family residential mortgage |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 23,687 | 19,679 |
Current | 1,101,099 | 1,461,493 |
Total ending loan balances | 1,124,786 | 1,481,172 |
Consumer | Traditional Loans and Leases | Single family residential mortgage | 30 - 59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 11,999 | 7,321 |
Consumer | Traditional Loans and Leases | Single family residential mortgage | 60 - 89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 1,370 | 3,160 |
Consumer | Traditional Loans and Leases | Single family residential mortgage | Greater than 89 Days Past due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 10,318 | 9,198 |
Consumer | Traditional Loans and Leases | Other consumer |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 764 | 4,151 |
Current | 56,050 | 63,701 |
Total ending loan balances | 56,814 | 67,852 |
Consumer | Traditional Loans and Leases | Other consumer | 30 - 59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 547 | 3,132 |
Consumer | Traditional Loans and Leases | Other consumer | 60 - 89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 0 | 573 |
Consumer | Traditional Loans and Leases | Other consumer | Greater than 89 Days Past due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 217 | 446 |
Commercial | Commercial and industrial |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total ending loan balances | 1,789,478 | 1,944,142 | 1,673,055
Commercial | Commercial real estate |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total ending loan balances | 891,029 | 867,013 | 823,193
Commercial | Multifamily |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total ending loan balances | 1,563,757 | 2,241,246 | 2,112,190
Commercial | SBA |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total ending loan balances | 75,359 | 68,741 | 71,494
Commercial | Construction |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total ending loan balances | 228,561 | 203,976 | $ 200,294
Commercial | Traditional Loans and Leases | Commercial and industrial |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 5,243 | 5,286 |
Current | 1,784,235 | 1,938,856 |
Total ending loan balances | 1,789,478 | 1,944,142 |
Commercial | Traditional Loans and Leases | Commercial and industrial | 30 - 59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 776 | 350 |
Commercial | Traditional Loans and Leases | Commercial and industrial | 60 - 89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 2,890 | 1,596 |
Commercial | Traditional Loans and Leases | Commercial and industrial | Greater than 89 Days Past due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 1,577 | 3,340 |
Commercial | Traditional Loans and Leases | Commercial real estate |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 0 | 582 |
Current | 891,029 | 866,431 |
Total ending loan balances | 891,029 | 867,013 |
Commercial | Traditional Loans and Leases | Commercial real estate | 30 - 59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 0 | 0 |
Commercial | Traditional Loans and Leases | Commercial real estate | 60 - 89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 0 | 582 |
Commercial | Traditional Loans and Leases | Commercial real estate | Greater than 89 Days Past due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 0 | 0 |
Commercial | Traditional Loans and Leases | Multifamily |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 0 | 356 |
Current | 1,563,757 | 2,240,890 |
Total ending loan balances | 1,563,757 | 2,241,246 |
Commercial | Traditional Loans and Leases | Multifamily | 30 - 59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 0 | 356 |
Commercial | Traditional Loans and Leases | Multifamily | 60 - 89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 0 | 0 |
Commercial | Traditional Loans and Leases | Multifamily | Greater than 89 Days Past due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 0 | 0 |
Commercial | Traditional Loans and Leases | SBA |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 2,369 | 1,490 |
Current | 72,990 | 67,251 |
Total ending loan balances | 75,359 | 68,741 |
Commercial | Traditional Loans and Leases | SBA | 30 - 59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 377 | 551 |
Commercial | Traditional Loans and Leases | SBA | 60 - 89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 230 | 77 |
Commercial | Traditional Loans and Leases | SBA | Greater than 89 Days Past due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 1,762 | 862 |
Commercial | Traditional Loans and Leases | Construction |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 2,519 | 939 |
Current | 226,042 | 203,037 |
Total ending loan balances | 228,561 | 203,976 |
Commercial | Traditional Loans and Leases | Construction | 30 - 59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 0 | 0 |
Commercial | Traditional Loans and Leases | Construction | 60 - 89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | 0 | 939 |
Commercial | Traditional Loans and Leases | Construction | Greater than 89 Days Past due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total Past Due | $ 2,519 | $ 0 |

X
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- Definition 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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5074-111524 + Details
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