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ALLOWANCE FOR LOAN AND LEASE LOSSES - Carrying Amount of Portfolios (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Financing Receivable Allowance For Credit Losses [Line Items]
Impaired Financing Receivable With No Related Allowance Recorded Investment	$ 219,107	$ 188,397
Impaired Financing Receivable With Related Allowance Recorded Investment	492,721	571,872
Impaired Financing Receivable Related Allowance	36,835	53,976		$ 49,514
Loans and Leases Receivable, Gross	9,113,955	8,858,123		8,640,291
Loans and Leases Receivable, Allowance	$ 172,011	$ 196,362	$ 183,732	222,035	$ 225,856	$ 231,843
Allowance for loan and lease losses, numerator [Member] | Impaired principal balance, denominator [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan and lease losses to principal balance	7.48%	9.44%
Allowance for loan and lease losses, numerator [Member] | Principal balance, denominator [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan and lease losses to principal balance	1.89%	2.22%
PCI loans
Financing Receivable Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross	$ 141,706	$ 146,640	144,443	152,242	155,281	158,174
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Allowance For Loan Losses	$ 11,434	$ 11,354	11,354	11,354	11,251	11,251
PCI loans | Allowance for loan and lease losses, numerator [Member] | Principal balance, denominator [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan and lease losses to principal balance	8.07%	7.74%
General Allowance [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross	$ 8,260,421	$ 7,951,214		7,747,915
Loans and Leases Receivable, Allowance	$ 123,742	$ 131,032		161,167
General Allowance [Member] | Allowance for loan and lease losses, numerator [Member] | Principal balance, denominator [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan and lease losses to principal balance	1.50%	1.65%
Residential Mortgage Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Impaired Financing Receivable With No Related Allowance Recorded Investment	$ 106,195	$ 110,238
Impaired Financing Receivable With Related Allowance Recorded Investment	284,821	293,494
Impaired Financing Receivable Related Allowance	18,788	19,965		19,804
Loans and Leases Receivable, Gross	3,070,746	3,163,208		3,238,001
Loans and Leases Receivable, Allowance	$ 48,284	$ 50,794	51,886	55,130	56,386	58,975
Residential Mortgage Loans [Member] | Allowance for loan and lease losses, numerator [Member] | Impaired principal balance, denominator [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan and lease losses to principal balance	6.60%	6.80%
Residential Mortgage Loans [Member] | Allowance for loan and lease losses, numerator [Member] | Principal balance, denominator [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan and lease losses to principal balance	1.57%	1.61%
Residential Mortgage Loans [Member] | PCI loans
Financing Receivable Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross	$ 138,367	$ 143,176		148,025
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Allowance For Loan Losses	$ 11,063	$ 10,954		10,954
Residential Mortgage Loans [Member] | PCI loans | Allowance for loan and lease losses, numerator [Member] | Principal balance, denominator [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan and lease losses to principal balance	8.00%	7.65%
Residential Mortgage Loans [Member] | General Allowance [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross	$ 2,541,363	$ 2,616,300		2,680,891
Loans and Leases Receivable, Allowance	$ 18,433	$ 19,875		24,372
Residential Mortgage Loans [Member] | General Allowance [Member] | Allowance for loan and lease losses, numerator [Member] | Principal balance, denominator [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan and lease losses to principal balance	0.73%	0.76%
Commercial Portfolio Segment [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross	$ 3,930,293	$ 3,750,202
Commercial Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Impaired Financing Receivable With No Related Allowance Recorded Investment	3,245	2,431
Impaired Financing Receivable With Related Allowance Recorded Investment	2,784	4,162
Impaired Financing Receivable Related Allowance	574	760		1,061
Loans and Leases Receivable, Gross	100,244	79,429		84,683
Loans and Leases Receivable, Allowance	$ 3,026	$ 3,592	3,331	3,949	4,122	4,522
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Allowance for loan and lease losses, numerator [Member] | Impaired principal balance, denominator [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan and lease losses to principal balance	20.62%	18.26%
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Allowance for loan and lease losses, numerator [Member] | Principal balance, denominator [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan and lease losses to principal balance	3.02%	4.52%
Commercial Portfolio Segment [Member] | Construction Loans [Member] | PCI loans
Financing Receivable Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross	$ 0	$ 0		0
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Allowance For Loan Losses	0	0		0
Commercial Portfolio Segment [Member] | Construction Loans [Member] | General Allowance [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross	94,215	72,836		73,422
Loans and Leases Receivable, Allowance	$ 2,452	$ 2,832		2,888
Commercial Portfolio Segment [Member] | Construction Loans [Member] | General Allowance [Member] | Allowance for loan and lease losses, numerator [Member] | Principal balance, denominator [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan and lease losses to principal balance	2.60%	3.89%
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Impaired Financing Receivable With No Related Allowance Recorded Investment	$ 28,854	$ 30,030
Impaired Financing Receivable With Related Allowance Recorded Investment	51,283	61,162
Impaired Financing Receivable Related Allowance	3,880	9,693		10,592
Loans and Leases Receivable, Gross	2,279,685	2,148,111		2,009,049
Loans and Leases Receivable, Allowance	$ 21,644	$ 32,546	22,321	44,000	47,659	48,871
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] | Allowance for loan and lease losses, numerator [Member] | Impaired principal balance, denominator [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan and lease losses to principal balance	7.57%	15.85%
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] | Allowance for loan and lease losses, numerator [Member] | Principal balance, denominator [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan and lease losses to principal balance	0.95%	1.52%
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] | PCI loans
Financing Receivable Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross	$ 0	$ 0		0
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Allowance For Loan Losses	0	0		0
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] | General Allowance [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross	2,199,548	2,056,919		1,897,678
Loans and Leases Receivable, Allowance	$ 17,764	$ 22,853		33,408
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] | General Allowance [Member] | Allowance for loan and lease losses, numerator [Member] | Principal balance, denominator [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan and lease losses to principal balance	0.81%	1.11%
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Impaired Financing Receivable With No Related Allowance Recorded Investment	$ 79,600	$ 43,358
Impaired Financing Receivable With Related Allowance Recorded Investment	127,909	184,068
Impaired Financing Receivable Related Allowance	9,023	17,684		12,204
Loans and Leases Receivable, Gross	1,550,364	1,522,662		1,533,308
Loans and Leases Receivable, Allowance	$ 46,373	$ 55,581	53,430	48,718	50,393	48,493
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | Allowance for loan and lease losses, numerator [Member] | Impaired principal balance, denominator [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan and lease losses to principal balance	7.05%	9.61%
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | Allowance for loan and lease losses, numerator [Member] | Principal balance, denominator [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan and lease losses to principal balance	2.99%	3.65%
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | PCI loans
Financing Receivable Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross	$ 3,339	$ 3,464		4,217
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Allowance For Loan Losses	$ 371	$ 400		400
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | PCI loans | Allowance for loan and lease losses, numerator [Member] | Principal balance, denominator [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan and lease losses to principal balance	11.11%	11.55%
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | General Allowance [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross	$ 1,339,516	$ 1,291,772		1,353,516
Loans and Leases Receivable, Allowance	$ 36,979	$ 37,497		36,114
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | General Allowance [Member] | Allowance for loan and lease losses, numerator [Member] | Principal balance, denominator [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan and lease losses to principal balance	2.76%	2.90%
Consumer Portfolio Segment [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Impaired Financing Receivable With No Related Allowance Recorded Investment	$ 1,213	$ 2,340
Impaired Financing Receivable With Related Allowance Recorded Investment	25,924	28,986
Impaired Financing Receivable Related Allowance	4,570	5,874		5,853
Loans and Leases Receivable, Gross	2,112,916	1,944,713		1,775,250
Loans and Leases Receivable, Allowance	$ 52,684	$ 53,849	$ 52,764	70,238	$ 67,296	$ 70,982
Consumer Portfolio Segment [Member] | Allowance for loan and lease losses, numerator [Member] | Impaired principal balance, denominator [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan and lease losses to principal balance	17.63%	20.26%
Consumer Portfolio Segment [Member] | Allowance for loan and lease losses, numerator [Member] | Principal balance, denominator [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan and lease losses to principal balance	2.49%	2.77%
Consumer Portfolio Segment [Member] | PCI loans
Financing Receivable Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross	$ 0	$ 0		0
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Allowance For Loan Losses	0	0		0
Consumer Portfolio Segment [Member] | General Allowance [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans and Leases Receivable, Gross	2,085,779	1,913,387		1,742,408
Loans and Leases Receivable, Allowance	$ 48,114	$ 47,975		$ 64,385
Consumer Portfolio Segment [Member] | General Allowance [Member] | Allowance for loan and lease losses, numerator [Member] | Principal balance, denominator [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan and lease losses to principal balance	2.31%	2.51%

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- Definition

Reserve for loans impairments recorded after acquisition as a result of current information and events which result in it being probable that estimated cash flows will be less than previously expected or because actual cash flows are less than cash flows previously expected. This relates to loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that was acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Amount of allowance for credit losses related to recorded investment.

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Amount of investment in impaired financing receivables for which there is no related allowance for credit losses.

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Amount of investment in impaired financing receivables for which there is a related allowance for credit losses.

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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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