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LOAN PORTFOLIO - Loans Held for Investment on Which Accrual of Interest Income had been Discontinued (Detail) - Nonaccrual [Member] - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Nonaccrual loans:
Nonaccrual loans held for investment	$ 253,105	$ 315,973
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]
Nonaccrual loans:
Nonaccrual loans held for investment	77,495	109,536
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member]
Nonaccrual loans:
Nonaccrual loans held for investment	21,327	30,382
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Land [Member]
Nonaccrual loans:
Nonaccrual loans held for investment	5,599	6,260
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Residential Mortgage [Member]
Nonaccrual loans:
Nonaccrual loans held for investment	1,337	2,102
Consumer Portfolio Segment [Member] | Consumer Auto Loans [Member]
Nonaccrual loans:
Nonaccrual loans held for investment	10,361	11,212
Consumer Portfolio Segment [Member] | Other Loans Member [Member]
Nonaccrual loans:
Nonaccrual loans held for investment	6,491	7,865
Consumer Portfolio Segment [Member] | Finance Lease [Member]
Nonaccrual loans:
Nonaccrual loans held for investment	994	1,329
Residential Portfolio Segment [Member]
Nonaccrual loans:
Nonaccrual loans held for investment	$ 129,501	$ 147,287

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- Definition

Non Performing Non Accrual Loans [Abstract]

+ References

No definition available.

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- Definition

Reflects the carrying amount of loans deemed to be questionable as to collection on which no interest is continuing to be recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5111-111524

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