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LOAN PORTFOLIO - Corporation's Aging of Loans Held for Investment Portfolio (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Dec. 31, 2016
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Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Total Past Due | $ 607,452 |  |  | $ 848,763 |  |  |  |
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Carrying Amount | 149,122 |  | $ 152,242 | 158,174 |  | $ 157,794 | $ 160,368 | $ 165,818
Financing Receivable, Current | 7,960,379 |  |  | 7,843,539 |  |  |  |
Loans held for investment | 8,716,953 |  |  | 8,850,476 |  | $ 8,877,214 |  |
90 days past due and still accruing | 134,293 | [1] |  | 131,420 | [2] |  |  |
30-59 Days Past Due [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Total Past Due | 50,075 |  |  | 87,856 |  |  |  |
60-89 Days Past Due [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Total Past Due | 83,716 |  |  | 139,933 |  |  |  |
90 days or more Past Due [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Total Past Due | 473,661 | [3] |  | 620,974 | [4] |  |  |
FHA/VA government-guaranteed loans [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Total Past Due | 111,075 | [1],[5],[6] |  | 109,607 | [2],[7],[8] |  |  |
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Carrying Amount | 0 | [1],[5],[6] |  | 0 | [2],[7],[8] |  |  |
Financing Receivable, Current | 39,696 | [1],[5],[6] |  | 29,332 | [2],[7],[8] |  |  |
Loans held for investment | 150,771 | [1],[5],[6] |  | 138,939 | [2],[7],[8] |  |  |
90 days past due and still accruing | 107,869 | [1],[5],[6] |  | 102,815 | [2],[7],[8] |  |  |
FHA/VA government-guaranteed loans [Member] | 30-59 Days Past Due [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Total Past Due | 0 | [1],[5],[6] |  | 0 | [2],[7],[8] |  |  |
FHA/VA government-guaranteed loans [Member] | 60-89 Days Past Due [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Total Past Due | 3,206 | [1],[5],[6] |  | 6,792 | [2],[7],[8] |  |  |
FHA/VA government-guaranteed loans [Member] | 90 days or more Past Due [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Total Past Due | 107,869 | [1],[3],[5],[6] |  | 102,815 | [2],[4],[7],[8] |  |  |
Other residential mortgage loans [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Total Past Due | 235,908 | [5] |  | 286,252 |  |  |  |
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Carrying Amount | 145,203 | [5] |  | 153,991 | [7] |  |  |
Financing Receivable, Current | 2,676,099 | [5] |  | 2,711,775 |  |  |  |
Loans held for investment | 3,057,210 | [5] |  | 3,152,018 |  |  |  |
90 days past due and still accruing | 15,208 | [5] |  | 15,459 |  |  |  |
Other residential mortgage loans [Member] | 30-59 Days Past Due [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Total Past Due | 0 | [5] |  | 0 |  |  |  |
Other residential mortgage loans [Member] | 60-89 Days Past Due [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Total Past Due | 64,015 | [5] |  | 92,502 |  |  |  |
Other residential mortgage loans [Member] | 90 days or more Past Due [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Total Past Due | 171,893 | [3],[5] |  | 193,750 |  |  |  |
Commercial and Industrial loans [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Total Past Due | 41,119 |  |  | 97,703 |  |  |  |
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Carrying Amount | 0 |  |  | 0 |  |  |  |
Financing Receivable, Current | 2,027,137 |  |  | 1,985,550 |  |  |  |
Loans held for investment | 2,068,256 |  |  | 2,083,253 |  |  |  |
90 days past due and still accruing | 4,447 | [1] |  | 2,317 | [2] |  |  |
Commercial and Industrial loans [Member] | 30-59 Days Past Due [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Total Past Due | 1,729 |  |  | 8,971 |  |  |  |
Commercial and Industrial loans [Member] | 60-89 Days Past Due [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Total Past Due | 392 |  |  | 576 |  |  |  |
Commercial and Industrial loans [Member] | 90 days or more Past Due [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Total Past Due | 38,998 | [3] |  | 88,156 | [4] |  |  |
Commercial mortgage loans [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Total Past Due | 121,648 | [5] |  | 170,705 | [7] |  |  |
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Carrying Amount | 3,919 | [5] |  | 4,183 | [7] |  |  |
Financing Receivable, Current | 1,380,935 | [5] |  | 1,440,084 | [7] |  |  |
Loans held for investment | 1,506,502 | [5] |  | 1,614,972 | [7] |  |  |
90 days past due and still accruing | 3,059 | [1],[5] |  | 6,687 | [2],[7] |  |  |
Commercial mortgage loans [Member] | 30-59 Days Past Due [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Total Past Due | 0 | [5] |  | 0 | [7] |  |  |
Commercial mortgage loans [Member] | 60-89 Days Past Due [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Total Past Due | 1,192 | [5] |  | 7,525 | [7] |  |  |
Commercial mortgage loans [Member] | 90 days or more Past Due [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Total Past Due | 120,456 | [3],[5] |  | 163,180 | [4],[7] |  |  |
Land [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Total Past Due | 6,973 | [5] |  | 15,301 | [7] |  |  |
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Carrying Amount | 0 |  |  | 0 | [7] |  |  |
Financing Receivable, Current | 14,331 | [5] |  | 11,630 | [7] |  |  |
Loans held for investment | 21,304 | [5] |  | 26,931 | [7] |  |  |
90 days past due and still accruing | 0 | [1],[5] |  | 151 | [2],[7] |  |  |
Land [Member] | 30-59 Days Past Due [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Total Past Due | 0 | [5] |  | 0 | [7] |  |  |
Land [Member] | 60-89 Days Past Due [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Total Past Due | 51 | [5] |  | 124 | [7] |  |  |
Land [Member] | 90 days or more Past Due [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Total Past Due | 6,922 | [3],[5] |  | 15,177 | [4],[7] |  |  |
Construction-commercial [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Total Past Due | 1,089 | [5] |  | 35,100 |  |  |  |
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Carrying Amount | 0 | [5] |  | 0 | [7] |  |  |
Financing Receivable, Current | 52,881 | [5] |  | 41,456 |  |  |  |
Loans held for investment | 53,970 | [5] |  | 76,556 |  |  |  |
90 days past due and still accruing | 0 | [1],[5] |  | 0 | [2] |  |  |
Construction-commercial [Member] | 30-59 Days Past Due [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Total Past Due | 0 | [5] |  | 0 |  |  |  |
Construction-commercial [Member] | 60-89 Days Past Due [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Total Past Due | 1,089 | [5] |  | 0 |  |  |  |
Construction-commercial [Member] | 90 days or more Past Due [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Total Past Due | 0 | [3],[5] |  | 35,100 | [4] |  |  |
Construction-residential [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Total Past Due | 2,149 | [5] |  | 2,082 | [7] |  |  |
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Carrying Amount | 0 | [5] |  | 0 | [7] |  |  |
Financing Receivable, Current | 5,439 | [5] |  | 5,828 | [7] |  |  |
Loans held for investment | 7,588 | [5] |  | 7,910 | [7] |  |  |
90 days past due and still accruing | 0 | [1],[5] |  | 0 | [2],[7] |  |  |
Construction-residential [Member] | 30-59 Days Past Due [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Total Past Due | 0 | [5] |  | 0 | [7] |  |  |
Construction-residential [Member] | 60-89 Days Past Due [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Total Past Due | 0 | [5] |  | 95 | [7] |  |  |
Construction-residential [Member] | 90 days or more Past Due [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Total Past Due | 2,149 | [3],[5] |  | 1,987 | [4],[7] |  |  |
Auto loans [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Total Past Due | 54,427 |  |  | 91,554 |  |  |  |
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Carrying Amount | 0 |  |  | 0 |  |  |  |
Financing Receivable, Current | 840,801 |  |  | 752,777 |  |  |  |
Loans held for investment | 895,228 |  |  | 844,331 |  |  |  |
90 days past due and still accruing | 0 | [1] |  | 0 | [2] |  |  |
Auto loans [Member] | 30-59 Days Past Due [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Total Past Due | 35,122 |  |  | 57,560 |  |  |  |
Auto loans [Member] | 60-89 Days Past Due [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Total Past Due | 7,047 |  |  | 23,783 |  |  |  |
Auto loans [Member] | 90 days or more Past Due [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Total Past Due | 12,258 | [3] |  | 10,211 | [4] |  |  |
Finance leases [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Total Past Due | 8,733 |  |  | 15,270 |  |  |  |
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Carrying Amount | 0 |  |  | 0 |  |  |  |
Financing Receivable, Current | 302,447 |  |  | 242,192 |  |  |  |
Loans held for investment | 311,180 |  |  | 257,462 |  |  |  |
90 days past due and still accruing | 0 | [1] |  | 0 | [2] |  |  |
Finance leases [Member] | 30-59 Days Past Due [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Total Past Due | 5,451 |  |  | 10,549 |  |  |  |
Finance leases [Member] | 60-89 Days Past Due [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Total Past Due | 1,839 |  |  | 3,484 |  |  |  |
Finance leases [Member] | 90 days or more Past Due [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Total Past Due | 1,443 | [3] |  | 1,237 | [4] |  |  |
Other consumer loans [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Total Past Due | 24,331 |  |  | 25,189 |  |  |  |
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Carrying Amount | 0 |  |  | 0 |  |  |  |
Financing Receivable, Current | 620,613 |  |  | 622,915 |  |  |  |
Loans held for investment | 644,944 |  |  | 648,104 |  |  |  |
90 days past due and still accruing | 3,710 | [1] |  | 3,991 | [2] |  |  |
Other consumer loans [Member] | 30-59 Days Past Due [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Total Past Due | 7,773 |  |  | 10,776 |  |  |  |
Other consumer loans [Member] | 60-89 Days Past Due [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Total Past Due | 4,885 |  |  | 5,052 |  |  |  |
Other consumer loans [Member] | 90 days or more Past Due [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Total Past Due | $ 11,673 | [3] |  | $ 9,361 | [4] |  |  |
[1] | It is the Corporationʼs policy to report delinquent residential mortgage loans insured by the FHA, guaranteed by the VA, and other government-insured loans as past-due loans 90 days and still accruing as opposed to non-performing loans since the principal repayment is insured. These balances include $33.9 million of residential mortgage loans insured by the FHA that were over 15 months delinquent, and were no longer accruing interest as of September 30, 2018, taking into consideration the FHA interest curtailment process.
[2] | It is the Corporationʼs policy to report delinquent residential mortgage loans insured by the FHA, guaranteed by the VA, and other government-insured loans as past-due loans 90 days and still accruing as opposed to non-performing loans since the principal repayment is insured. These balances include $29.9 million of residential mortgage loans insured by the FHA that were over 15 months delinquent, and were no longer accruing interest as of December 31, 2017, taking into consideration the FHA interest curtailment process.
[3] | Includes non-performing loans and accruing loans that were contractually delinquent 90 days or more (i.e., FHA/VA guaranteed loans and credit cards). Credit card loans continue to accrue finance charges and fees until charged-off at 180 days.
[4] | Includes non-performing loans and accruing loans that were contractually delinquent 90 days or more (i.e., FHA/VA guaranteed loans and credit cards). Credit card loans continue to accrue finance charges and fees until charged-off at 180 days.
[5] | According to the Corporationʼs delinquency policy and consistent with the instructions for the preparation of the Consolidated Financial Statements for Bank Holding Companies (FR Y-9C) required by the Federal Reserve Board, residential mortgage, commercial mortgage, and construction loans are considered past due when the borrower is in arrears on two or more monthly payments. FHA/VA government-guaranteed loans, other residential mortgage loans, commercial mortgage loans and land loans past due 30-59 days as of September 30, 2018 amounted to $7.0 million, $108.1 million, $4.2 million and $0.1 million, respectively.
[6] | As of September 30, 2018, includes $75.9 million of defaulted loans collateralizing GNMA securities for which the Corporation has an unconditional option (but not an obligation) to repurchase the defaulted loans.
[7] | According to the Corporationʼs delinquency policy and consistent with the instructions for the preparation of the Consolidated Financial Statements for Bank Holding Companies (FR Y-9C) required by the Federal Reserve Board, residential mortgage, commercial mortgage, and construction loans are considered past due when the borrower is in arrears on two or more monthly payments. FHA/VA government-guaranteed loans, other residential mortgage loans, commercial mortgage loans, and land loans past due 30-59 days as of December 31, 2017 amounted to $6.0 million, $224.0 million, $9.0 million, and $2.5 million, respectively.
[8] | As of December 31, 2017, includes $62.1 million of defaulted loans collateralizing GNMA securities for which the Corporation has an unconditional option (but not an obligation) to repurchase the defaulted loans.

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