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LOAN PORTFOLIO - Corporation's Aging of Loans Held for Investment Portfolio (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Total Past Due | $ 848,763 |  | $ 881,954 |  |
Certain Loans Acquired In Transfer Accounted For As Debt Securities Carrying Amount | 158,174 | [1] | 165,818 | [2] | $ 173,913
Financing Receivable, Current | 7,843,539 |  | 7,839,101 |  |
Loans held for investment | 8,850,476 |  | 8,886,873 |  |
90 days past due and still accruing | 131,420 |  | 106,809 |  |
Financing Receivables 30 To 59 Days Past Due [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Total Past Due | 87,856 |  | 86,726 |  |
Financing Receivables 60 To 89 Days Past Due [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Total Past Due | 139,933 |  | 128,325 |  |
Financing Receivables Equal To Greater Than 90 Days Past Due [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Total Past Due | 620,974 | [3] | 666,903 |  |
Fha Va And Other Government Guaranteed Loans [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Total Past Due | 109,607 | [4],[5],[6] | 82,231 | [7],[8],[9] |
Certain Loans Acquired In Transfer Accounted For As Debt Securities Carrying Amount | 0 | [4],[5],[6] | 0 |  |
Financing Receivable, Current | 29,332 | [4],[5],[6] | 44,627 | [7],[8],[9] |
Loans held for investment | 138,939 | [4],[5],[6] | 126,858 | [7],[8],[9] |
90 days past due and still accruing | 102,815 | [4],[5],[6] | 77,052 | [7],[8],[9] |
Fha Va And Other Government Guaranteed Loans [Member] | Financing Receivables 30 To 59 Days Past Due [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Total Past Due | 0 | [4],[5],[6] | 0 | [7],[8],[9] |
Fha Va And Other Government Guaranteed Loans [Member] | Financing Receivables 60 To 89 Days Past Due [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Total Past Due | 6,792 | [4],[5],[6] | 5,179 | [7],[8],[9] |
Fha Va And Other Government Guaranteed Loans [Member] | Financing Receivables Equal To Greater Than 90 Days Past Due [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Total Past Due | 102,815 | [3],[4],[5],[6] | 77,052 | [7],[8],[9],[10] |
Residential Mortgage [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Certain Loans Acquired In Transfer Accounted For As Debt Securities Carrying Amount | 153,991 |  | 162,676 |  |
Loans held for investment | 3,290,957 |  | 3,296,031 |  |
Commercial And Industrial [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Total Past Due | 97,703 |  | 169,886 |  |
Certain Loans Acquired In Transfer Accounted For As Debt Securities Carrying Amount | 0 |  | 0 |  |
Financing Receivable, Current | 1,985,550 |  | 2,010,569 |  |
Loans held for investment | 2,083,253 |  | 2,180,455 |  |
90 days past due and still accruing | 2,317 |  | 5,368 |  |
Commercial And Industrial [Member] | Financing Receivables 30 To 59 Days Past Due [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Total Past Due | 8,971 |  | 14,195 |  |
Commercial And Industrial [Member] | Financing Receivables 60 To 89 Days Past Due [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Total Past Due | 576 |  | 3,724 |  |
Commercial And Industrial [Member] | Financing Receivables Equal To Greater Than 90 Days Past Due [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Total Past Due | 88,156 | [3] | 151,967 |  |
Commercial Mortgage Loans [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Total Past Due | 170,705 | [4] | 186,511 | [7] |
Certain Loans Acquired In Transfer Accounted For As Debt Securities Carrying Amount | 4,183 | [4] | 3,142 | [7] |
Financing Receivable, Current | 1,440,084 | [4] | 1,379,155 | [7] |
Loans held for investment | 1,614,972 | [4] | 1,568,808 | [7] |
90 days past due and still accruing | 6,687 | [4] | 3,281 | [7] |
Commercial Mortgage Loans [Member] | Financing Receivables 30 To 59 Days Past Due [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Total Past Due | 0 | [4] | 0 | [7] |
Commercial Mortgage Loans [Member] | Financing Receivables 60 To 89 Days Past Due [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Total Past Due | 7,525 | [4] | 4,534 | [7] |
Commercial Mortgage Loans [Member] | Financing Receivables Equal To Greater Than 90 Days Past Due [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Total Past Due | 163,180 | [3],[4] | 181,977 | [7],[10] |
Construction Loans [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Loans held for investment | 111,397 |  | 124,951 |  |
Consumer Auto Loans [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Total Past Due | 91,554 |  | 85,011 |  |
Certain Loans Acquired In Transfer Accounted For As Debt Securities Carrying Amount | 0 |  | 0 |  |
Financing Receivable, Current | 752,777 |  | 762,947 |  |
Loans held for investment | 844,331 |  | 847,958 |  |
90 days past due and still accruing | 0 |  | 0 |  |
Consumer Auto Loans [Member] | Financing Receivables 30 To 59 Days Past Due [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Total Past Due | 57,560 |  | 57,142 |  |
Consumer Auto Loans [Member] | Financing Receivables 60 To 89 Days Past Due [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Total Past Due | 23,783 |  | 13,523 |  |
Consumer Auto Loans [Member] | Financing Receivables Equal To Greater Than 90 Days Past Due [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Total Past Due | 10,211 | [3] | 14,346 |  |
Finance Leases [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Total Past Due | 15,270 |  | 10,720 |  |
Certain Loans Acquired In Transfer Accounted For As Debt Securities Carrying Amount | 0 |  | 0 |  |
Financing Receivable, Current | 242,192 |  | 222,615 |  |
Loans held for investment | 257,462 |  | 233,335 |  |
90 days past due and still accruing | 0 |  | 0 |  |
Finance Leases [Member] | Financing Receivables 30 To 59 Days Past Due [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Total Past Due | 10,549 |  | 7,714 |  |
Finance Leases [Member] | Financing Receivables 60 To 89 Days Past Due [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Total Past Due | 3,484 |  | 1,671 |  |
Finance Leases [Member] | Financing Receivables Equal To Greater Than 90 Days Past Due [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Total Past Due | 1,237 | [3] | 1,335 |  |
Consumer Loan [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Total Past Due | 25,189 |  | 25,257 |  |
Certain Loans Acquired In Transfer Accounted For As Debt Securities Carrying Amount | 0 |  | 0 |  |
Financing Receivable, Current | 622,915 |  | 610,078 |  |
Loans held for investment | 648,104 |  | 635,335 |  |
90 days past due and still accruing | 3,991 |  | 3,929 |  |
Consumer Loan [Member] | Financing Receivables 30 To 59 Days Past Due [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Total Past Due | 10,776 |  | 7,675 |  |
Consumer Loan [Member] | Financing Receivables 60 To 89 Days Past Due [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Total Past Due | 5,052 |  | 5,254 |  |
Consumer Loan [Member] | Financing Receivables Equal To Greater Than 90 Days Past Due [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Total Past Due | 9,361 | [3] | 12,328 |  |
Commercial Construction [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Total Past Due | 35,100 |  | 36,893 |  |
Certain Loans Acquired In Transfer Accounted For As Debt Securities Carrying Amount | 0 |  | 0 |  |
Financing Receivable, Current | 41,456 |  | 40,582 |  |
Loans held for investment | 76,556 |  | 77,475 |  |
90 days past due and still accruing | 0 |  | 0 |  |
Commercial Construction [Member] | Financing Receivables 30 To 59 Days Past Due [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Total Past Due | 0 |  | 0 |  |
Commercial Construction [Member] | Financing Receivables 60 To 89 Days Past Due [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Total Past Due | 0 |  | 0 |  |
Commercial Construction [Member] | Financing Receivables Equal To Greater Than 90 Days Past Due [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Total Past Due | 35,100 | [3] | 36,893 |  |
Residential Construction [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Total Past Due | 2,082 | [4] | 1,933 | [7] |
Certain Loans Acquired In Transfer Accounted For As Debt Securities Carrying Amount | 0 |  | 0 |  |
Financing Receivable, Current | 5,828 | [4] | 13,777 | [7] |
Loans held for investment | 7,910 | [4] | 15,710 | [7] |
90 days past due and still accruing | 0 | [4] | 0 | [7] |
Residential Construction [Member] | Financing Receivables 30 To 59 Days Past Due [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Total Past Due | 0 | [4] | 0 | [7] |
Residential Construction [Member] | Financing Receivables 60 To 89 Days Past Due [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Total Past Due | 95 | [4] | 0 | [7] |
Residential Construction [Member] | Financing Receivables Equal To Greater Than 90 Days Past Due [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Total Past Due | 1,987 | [3],[4] | 1,933 | [7],[10] |
Land Construction [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Total Past Due | 15,301 | [4] | 11,940 | [7] |
Certain Loans Acquired In Transfer Accounted For As Debt Securities Carrying Amount | 0 |  | 0 |  |
Financing Receivable, Current | 11,630 | [4] | 19,826 | [7] |
Loans held for investment | 26,931 | [4] | 31,766 | [7] |
90 days past due and still accruing | 151 | [4] | 478 | [7] |
Land Construction [Member] | Financing Receivables 30 To 59 Days Past Due [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Total Past Due | 0 | [4] | 0 | [7] |
Land Construction [Member] | Financing Receivables 60 To 89 Days Past Due [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Total Past Due | 124 | [4] | 436 | [7] |
Land Construction [Member] | Financing Receivables Equal To Greater Than 90 Days Past Due [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Total Past Due | 15,177 | [3],[4] | 11,504 | [7],[10] |
Other Residential Mortgage Loans [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Total Past Due | 286,252 | [4] | 271,572 | [7] |
Certain Loans Acquired In Transfer Accounted For As Debt Securities Carrying Amount | 153,991 | [4] | 162,676 |  |
Financing Receivable, Current | 2,711,775 | [4] | 2,734,925 | [7] |
Loans held for investment | 3,152,018 | [4] | 3,169,173 | [7] |
90 days past due and still accruing | 15,459 | [4] | 16,701 | [7] |
Other Residential Mortgage Loans [Member] | Financing Receivables 30 To 59 Days Past Due [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Total Past Due | 0 | [4] | 0 | [7] |
Other Residential Mortgage Loans [Member] | Financing Receivables 60 To 89 Days Past Due [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Total Past Due | 92,502 | [4] | 94,004 | [7] |
Other Residential Mortgage Loans [Member] | Financing Receivables Equal To Greater Than 90 Days Past Due [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Total Past Due | $ 193,750 | [3],[4] | $ 177,568 | [7],[10] |
[1] | According to the Corporation's 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 and commercial mortgage loans are considered past due when the borrower is in arrears two or more monthly payments. PCI residential mortgage loans and commercial mortgage loans past due 30-59 days as of December 31, 2017 amounted to $28.1 million and $0.2 million, respectively.
[2] | According to the Corporation's 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 and commercial mortgage loans are considered past due when the borrower is in arrears two or more monthly payments. PCI residential mortgage loans and commercial mortgage loans past due 30-59 days as of December 31, 2016 amounted to $22.3 million and $0.1 million, respectively.
[3] | Includes non-performing loans and accruing loans that are 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] | According to the Corporation's 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.
[5] | 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.
[6] | It is the Corporation's policy to report delinquent residential mortgage loans insured by the FHA or guaranteed by the VA 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 or guaranteed by the VA that are over 15 months delinquent, and are no longer accruing interest as of December 31, 2017.
[7] | According to the Corporation's 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 two or more monthly payments. FHA/VA government-guaranteed loans, other residential mortgage loans, commercial mortgage loans, land loans, and construction-residential loans past-due 30-59 days as of December 31, 2016 amounted to $9.9 million, $142.8 million, $4.6 million, $0.7 million, and $0.4 million, respectively.
[8] | As of December 31, 2016, includes $43.7 million of defaulted loans collateralizing GNMA securities for which the Corporation has an unconditional option (but not an obligation) to repurchase the defaulted loans.
[9] | It is the Corporation's policy to report delinquent residential mortgage loans insured by the FHA or guaranteed by the VA as past-due loans 90 days and still accruing as opposed to non-performing loans since the principal repayment is insured. These balances include $29.3 million of residential mortgage loans insured by the FHA or guaranteed by the VA that are over 15 months delinquent, and are no longer accruing interest as of December 31, 2016.
[10] | Includes non-performing loans and accruing loans that are 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.

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- Definition The recorded balance for loans accounted for as debt securities with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References No definition available. + Details
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