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LOAN PORTFOLIO - Loan Restructuring and Effect on Allowance for Loan and Lease Losses (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Financing Receivable Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	$ 625,720	$ 585,795	$ 625,720	$ 585,795	$ 557,196	$ 587,219	$ 568,543	$ 647,048
Amount charged-off	36,312	19,369	93,368	107,751
Provision	11,524	75,013	51,604	118,551
Loans and Leases Receivable, Allowance	200,563	230,870	200,563	230,870	$ 222,035	231,843	$ 173,485	$ 205,603
Loans Split [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	65,706	35,603	65,706	35,603
Amount charged-off			1,137	0
Provision			1,407	(1,080)
Loans and Leases Receivable, Allowance	4,116	$ 4,061	4,116	$ 4,061
Accrual [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	$ 510,846		$ 510,846			$ 374,695

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- Definition

Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

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The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings.

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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.

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Amount of expense related to estimated loss from loan and lease transactions.

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