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LOAN PORTFOLIO - Loan Modifications are Considered TDRs (Detail) $ in Thousands	12 Months Ended
	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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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

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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

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Pre-modification amount of investment in financing receivables modified by troubled debt restructurings.

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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

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