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LOAN PORTFOLIO - Loan Modifications are Considered TDRs (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) numberofcontracts | Dec. 31, 2016 USD ($) numberofcontracts | Dec. 31, 2015 USD ($) numberofcontracts
Financing Receivable Modifications [Line Items] |  |  |
Number of contracts | numberofcontracts | 1,275 | 2,228 | 2,585
Pre-modification Outstanding Recorded Investment | $ 94,796 | $ 86,106 | $ 117,770
Post-Modification Outstanding Recorded Investment | $ 93,837 | $ 84,942 | $ 111,890
Non-FHA/VA Residential Mortgage loans [Member] |  |  |
Financing Receivable Modifications [Line Items] |  |  |
Number of contracts | numberofcontracts | 132 | 209 | 408
Pre-modification Outstanding Recorded Investment | $ 19,484 | $ 30,940 | $ 67,006
Post-Modification Outstanding Recorded Investment | $ 19,263 | $ 29,668 | $ 64,679
Commercial Mortgage Loans [Member] |  |  |
Financing Receivable Modifications [Line Items] |  |  |
Number of contracts | numberofcontracts | 13 | 11 | 16
Pre-modification Outstanding Recorded Investment | $ 25,722 | $ 5,710 | $ 22,366
Post-Modification Outstanding Recorded Investment | $ 25,018 | $ 5,739 | $ 19,914
Commercial And Industrial Loans [Member] |  |  |
Financing Receivable Modifications [Line Items] |  |  |
Number of contracts | numberofcontracts | 21 | 25 | 5
Pre-modification Outstanding Recorded Investment | $ 39,428 | $ 22,182 | $ 5,971
Post-Modification Outstanding Recorded Investment | $ 39,338 | $ 22,184 | $ 5,351
Auto loans [Member] |  |  |
Financing Receivable Modifications [Line Items] |  |  |
Number of contracts | numberofcontracts | 426 | 744 | 756
Pre-modification Outstanding Recorded Investment | $ 6,451 | $ 13,141 | $ 12,219
Post-Modification Outstanding Recorded Investment | $ 6,451 | $ 13,141 | $ 11,985
Finance Leases [Member] |  |  |
Financing Receivable Modifications [Line Items] |  |  |
Number of contracts | numberofcontracts | 22 | 74 | 55
Pre-modification Outstanding Recorded Investment | $ 548 | $ 1,878 | $ 1,447
Post-Modification Outstanding Recorded Investment | $ 548 | $ 1,878 | $ 1,250
Other Consumer Loans [Member] |  |  |
Financing Receivable Modifications [Line Items] |  |  |
Number of contracts | numberofcontracts | 657 | 1,156 | 1,338
Pre-modification Outstanding Recorded Investment | $ 3,041 | $ 5,496 | $ 8,158
Post-Modification Outstanding Recorded Investment | $ 3,094 | $ 5,576 | $ 8,111
Land Construction [Member] |  |  |
Financing Receivable Modifications [Line Items] |  |  |
Number of contracts | numberofcontracts | 4 | 9 | 7
Pre-modification Outstanding Recorded Investment | $ 122 | $ 6,759 | $ 603
Post-Modification Outstanding Recorded Investment | $ 125 | $ 6,756 | $ 600

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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524 + Details
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- Definition Post-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524 + Details
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