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LOAN PORTFOLIO - Loan Portfolio Held for Investment (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Financial Information [Line Items] |  |  |
Loans and leases receivable gross carrying value |  | $ 8,850,476 | $ 8,886,873
Less: allowance for loan and lease losses |  | (231,843) | (205,603)
Loans held for investment, net |  | 8,618,633 | 8,681,270
Residential Mortgage [Member] |  |  |
Financial Information [Line Items] |  |  |
Loans and leases receivable gross carrying value |  | 3,290,957 | 3,296,031
Commercial Real Estate Portfolio Segment [Member] |  |  |
Financial Information [Line Items] |  |  |
Loans and leases receivable gross carrying value |  | 1,614,972 | 1,568,808
Commercial And Industrial Sector [Member] |  |  |
Financial Information [Line Items] |  |  |
Loans and leases receivable gross carrying value | [1] | 2,083,253 | 2,180,455
Commercial Portfolio Segment [Member] |  |  |
Financial Information [Line Items] |  |  |
Loans and leases receivable gross carrying value |  | 3,809,622 | 3,874,214
Finance Leases [Member] |  |  |
Financial Information [Line Items] |  |  |
Loans and leases receivable gross carrying value |  | 257,462 | 233,335
Other Consumer Loans [Member] |  |  |
Financial Information [Line Items] |  |  |
Loans and leases receivable gross carrying value |  | 1,492,435 | 1,483,293
Construction Loans [Member] |  |  |
Financial Information [Line Items] |  |  |
Loans and leases receivable gross carrying value |  | 111,397 | 124,951
Consumer Loan [Member] |  |  |
Financial Information [Line Items] |  |  |
Loans and leases receivable gross carrying value |  | $ 648,104 | $ 635,335
[1] | As of December 31, 2017 and 2016, includes $833.5 million and $853.9 million, respectively, of commercial loans that are secured by real estate but are not dependent upon the real estate for repayment.

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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 + Details
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