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LOAN PORTFOLIO- Corporation's Aging of Purchased Credit Impaired Loans (Parenthetical) (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Accounts Notes And Loans Receivable [Line Items]
Loans and Leases Receivable, Gross	$ 9,113,955		$ 8,858,123	$ 8,640,291
Residential Portfolio Segment [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans and Leases Receivable, Gross	3,070,746		3,163,208	3,238,001
Commercial Portfolio Segment [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans and Leases Receivable, Gross	3,930,293		3,750,202
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans and Leases Receivable, Gross	1,550,364		1,522,662	1,533,308
Financing Receivables 30 To 59 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans and Leases Receivable, Gross	19,400		5,100
Financial Asset Acquired with Credit Deterioration [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans and Leases Receivable, Gross	141,706	$ 144,443	146,640	152,242	$ 155,281	$ 158,174
Financial Asset Acquired with Credit Deterioration [Member] | Residential Portfolio Segment [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans and Leases Receivable, Gross	138,367		143,176	148,025
Financial Asset Acquired with Credit Deterioration [Member] | Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans and Leases Receivable, Gross	3,339		3,464	$ 4,217
Financial Asset Acquired with Credit Deterioration [Member] | Financing Receivables 30 To 59 Days Past Due [Member] | Residential Portfolio Segment [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans and Leases Receivable, Gross	13,700		$ 11,600
Financial Asset Acquired with Credit Deterioration [Member] | Financing Receivables 30 To 59 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans and Leases Receivable, Gross	$ 100

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522

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