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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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- Definition 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 + Details
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