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LOAN PORTFOLIO- Corporation's Aging of Purchased Credit Impaired Loans (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017
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Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Total Past Due | $ 507,033 |  | $ 574,654 |  |  |
Financing Receivable, Current | 8,465,216 |  | 8,136,829 |  |  |
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] |  |  |  |  |  |
Total Past Due | 82,572 |  | 111,520 |  |  |
Financing Receivable, Current | 1,464,453 |  | 1,407,678 |  |  |
Loans and Leases Receivable, Gross | 1,550,364 |  | 1,522,662 | 1,533,308 |  |
PCI loans |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Total Past Due | 34,773 |  | 36,423 |  |  |
Financing Receivable, Current | 106,933 |  | 110,217 |  |  |
Loans and Leases Receivable, Gross | 141,706 | $ 144,443 | 146,640 | 152,242 | $ 155,281 | $ 158,174
PCI loans | Residential Portfolio Segment [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Total Past Due | 32,376 |  | 33,911 |  |  |
Financing Receivable, Current | 105,991 |  | 109,265 |  |  |
Loans and Leases Receivable, Gross | 138,367 |  | 143,176 | 148,025 |  |
PCI loans | Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Total Past Due | 2,397 |  | 2,512 |  |  |
Financing Receivable, Current | 942 |  | 952 |  |  |
Loans and Leases Receivable, Gross | 3,339 |  | 3,464 | $ 4,217 |  |
30-59 Days Past Due [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Total Past Due | 48,860 |  | 49,020 |  |  |
30-59 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Total Past Due | 0 |  | 0 |  |  |
Loans and Leases Receivable, Gross | 19,400 |  | 5,100 |  |  |
30-59 Days Past Due [Member] | PCI loans |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Total Past Due | 0 |  | 0 |  |  |
30-59 Days Past Due [Member] | PCI loans | Residential Portfolio Segment [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Total Past Due | 0 |  | 0 |  |  |
Loans and Leases Receivable, Gross | 13,700 |  | 11,600 |  |  |
30-59 Days Past Due [Member] | PCI loans | Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Total Past Due | 0 |  | 0 |  |  |
Loans and Leases Receivable, Gross | 100 |  |  |  |  |
60-89 Days Past Due [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Total Past Due | 90,324 |  | 80,578 |  |  |
60-89 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Total Past Due | 1,473 |  | 1,038 |  |  |
60-89 Days Past Due [Member] | PCI loans |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Total Past Due | 7,750 |  | 6,979 |  |  |
60-89 Days Past Due [Member] | PCI loans | Residential Portfolio Segment [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Total Past Due | 7,750 |  | 6,979 |  |  |
60-89 Days Past Due [Member] | PCI loans | Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Total Past Due | 0 |  | 0 |  |  |
90 days or more Past Due [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Total Past Due | 367,849 |  | 445,056 |  |  |
90 days or more Past Due [Member] | Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Total Past Due | 81,099 |  | 110,482 |  |  |
90 days or more Past Due [Member] | PCI loans |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Total Past Due | 27,023 |  | 29,444 |  |  |
90 days or more Past Due [Member] | PCI loans | Residential Portfolio Segment [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Total Past Due | 24,626 |  | 26,932 |  |  |
90 days or more Past Due [Member] | PCI loans | Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Total Past Due | $ 2,397 |  | $ 2,512 |  |  |

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