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LOAN PORTFOLIO - Corporation's Aging of Loans Held for Investment Portfolio (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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Financing Receivable, Past Due [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 |  |
90 days past due and still accruing | 114,744 |  | 129,083 |  |  |
Residential Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross | 3,070,746 |  | 3,163,208 | 3,238,001 |  |
Residential Portfolio Segment [Member] | Other Loans Member [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total Past Due | 213,983 |  | 223,928 |  |  |
Financing Receivable, Current | 2,585,496 |  | 2,648,899 |  |  |
Loans and Leases Receivable, Gross | 2,937,846 |  | 3,016,003 |  |  |
90 days past due and still accruing | 16,607 |  | 14,564 |  |  |
Residential Portfolio Segment [Member] | Loans Insured or Guaranteed by US Government Authorities [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total Past Due | 94,187 |  | 108,934 |  |  |
Financing Receivable, Current | 38,713 |  | 38,271 |  |  |
Loans and Leases Receivable, Gross | 132,900 |  | 147,205 |  |  |
90 days past due and still accruing | 89,687 |  | 104,751 |  |  |
Commercial Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross | 3,930,293 |  | 3,750,202 |  |  |
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] |  |  |  |  |  |
Financing Receivable, Past Due [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 |  |
90 days past due and still accruing | 3,604 |  | 946 |  |  |
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total Past Due | 24,360 |  | 38,001 |  |  |
Financing Receivable, Current | 2,255,325 |  | 2,110,110 |  |  |
Loans and Leases Receivable, Gross | 2,279,685 |  | 2,148,111 | 2,009,049 |  |
90 days past due and still accruing | 1,319 |  | 5,003 |  |  |
Commercial Portfolio Segment [Member] | Construction Loans [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross | 100,244 |  | 79,429 | 84,683 |  |
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Residential Mortgage [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total Past Due | 1,337 |  | 2,102 |  |  |
Financing Receivable, Current | 10,791 |  | 9,049 |  |  |
Loans and Leases Receivable, Gross | 12,128 |  | 11,151 |  |  |
90 days past due and still accruing | 0 |  | 0 |  |  |
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Commercial Loan [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total Past Due | 2,800 |  | 0 |  |  |
Financing Receivable, Current | 66,136 |  | 47,965 |  |  |
Loans and Leases Receivable, Gross | 68,936 |  | 47,965 |  |  |
90 days past due and still accruing | 0 |  | 0 |  |  |
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Land [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total Past Due | 5,927 |  | 6,534 |  |  |
Financing Receivable, Current | 13,253 |  | 13,779 |  |  |
Loans and Leases Receivable, Gross | 19,180 |  | 20,313 |  |  |
90 days past due and still accruing | 222 |  | 67 |  |  |
Consumer Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross | 2,112,916 |  | 1,944,713 | 1,775,250 |  |
Consumer Portfolio Segment [Member] | Other Loans Member [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total Past Due | 23,512 |  | 26,057 |  |  |
Financing Receivable, Current | 683,401 |  | 638,644 |  |  |
Loans and Leases Receivable, Gross | 706,913 |  | 664,701 |  |  |
90 days past due and still accruing | 3,305 |  | 3,752 |  |  |
Consumer Portfolio Segment [Member] | Consumer Auto Loans [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total Past Due | 50,408 |  | 49,385 |  |  |
Financing Receivable, Current | 984,688 |  | 897,091 |  |  |
Loans and Leases Receivable, Gross | 1,035,096 |  | 946,476 |  |  |
90 days past due and still accruing | 0 |  | 0 |  |  |
Consumer Portfolio Segment [Member] | Finance Lease [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total Past Due | 7,947 |  | 8,193 |  |  |
Financing Receivable, Current | 362,960 |  | 325,343 |  |  |
Loans and Leases Receivable, Gross | 370,907 |  | 333,536 |  |  |
90 days past due and still accruing | 0 |  | 0 |  |  |
PCI loans |  |  |  |  |  |
Financing Receivable, Past Due [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] |  |  |  |  |  |
Financing Receivable, Past Due [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 | Residential Portfolio Segment [Member] | Other Loans Member [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross | 138,367 |  | 143,176 |  |  |
PCI loans | Residential Portfolio Segment [Member] | Loans Insured or Guaranteed by US Government Authorities [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross | 0 |  | 0 |  |  |
PCI loans | Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] |  |  |  |  |  |
Financing Receivable, Past Due [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 |  |
PCI loans | Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross | 0 |  | 0 | 0 |  |
PCI loans | Commercial Portfolio Segment [Member] | Construction Loans [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross | 0 |  | 0 | 0 |  |
PCI loans | Commercial Portfolio Segment [Member] | Construction Loans [Member] | Residential Mortgage [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross | 0 |  | 0 |  |  |
PCI loans | Commercial Portfolio Segment [Member] | Construction Loans [Member] | Commercial Loan [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross | 0 |  | 0 |  |  |
PCI loans | Commercial Portfolio Segment [Member] | Construction Loans [Member] | Land [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross | 0 |  | 0 |  |  |
PCI loans | Consumer Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross | 0 |  | 0 | $ 0 |  |
PCI loans | Consumer Portfolio Segment [Member] | Other Loans Member [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross | 0 |  | 0 |  |  |
PCI loans | Consumer Portfolio Segment [Member] | Consumer Auto Loans [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross | 0 |  | 0 |  |  |
PCI loans | Consumer Portfolio Segment [Member] | Finance Lease [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross | 0 |  | 0 |  |  |
30-59 Days Past Due [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total Past Due | 48,860 |  | 49,020 |  |  |
30-59 Days Past Due [Member] | Residential Portfolio Segment [Member] | Other Loans Member [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total Past Due | 0 |  | 0 |  |  |
Loans and Leases Receivable, Gross | 110,100 |  | 101,400 |  |  |
30-59 Days Past Due [Member] | Residential Portfolio Segment [Member] | Loans Insured or Guaranteed by US Government Authorities [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total Past Due | 0 |  | 0 |  |  |
Loans and Leases Receivable, Gross | 6,000 |  | 5,600 |  |  |
30-59 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total Past Due | 0 |  | 0 |  |  |
Loans and Leases Receivable, Gross | 19,400 |  | 5,100 |  |  |
30-59 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total Past Due | 960 |  | 2,550 |  |  |
30-59 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Construction Loans [Member] | Residential Mortgage [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total Past Due | 0 |  | 0 |  |  |
30-59 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Construction Loans [Member] | Commercial Loan [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total Past Due | 0 |  | 0 |  |  |
30-59 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Construction Loans [Member] | Land [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total Past Due | 0 |  | 0 |  |  |
Loans and Leases Receivable, Gross | 100 |  | 200 |  |  |
30-59 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Other Loans Member [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total Past Due | 8,588 |  | 9,898 |  |  |
30-59 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Consumer Auto Loans [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total Past Due | 33,421 |  | 31,070 |  |  |
30-59 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Finance Lease [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total Past Due | 5,891 |  | 5,502 |  |  |
30-59 Days Past Due [Member] | PCI loans |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total Past Due | 0 |  | 0 |  |  |
30-59 Days Past Due [Member] | PCI loans | Residential Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable, Past Due [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] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total Past Due | 0 |  | 0 |  |  |
Loans and Leases Receivable, Gross | 100 |  |  |  |  |
60-89 Days Past Due [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total Past Due | 90,324 |  | 80,578 |  |  |
60-89 Days Past Due [Member] | Residential Portfolio Segment [Member] | Other Loans Member [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total Past Due | 67,875 |  | 62,077 |  |  |
60-89 Days Past Due [Member] | Residential Portfolio Segment [Member] | Loans Insured or Guaranteed by US Government Authorities [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total Past Due | 4,500 |  | 4,183 |  |  |
60-89 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total Past Due | 1,473 |  | 1,038 |  |  |
60-89 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total Past Due | 754 |  | 66 |  |  |
60-89 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Construction Loans [Member] | Residential Mortgage [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total Past Due | 0 |  | 0 |  |  |
60-89 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Construction Loans [Member] | Commercial Loan [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total Past Due | 2,800 |  | 0 |  |  |
60-89 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Construction Loans [Member] | Land [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total Past Due | 106 |  | 207 |  |  |
60-89 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Other Loans Member [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total Past Due | 5,128 |  | 4,542 |  |  |
60-89 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Consumer Auto Loans [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total Past Due | 6,626 |  | 7,103 |  |  |
60-89 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Finance Lease [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total Past Due | 1,062 |  | 1,362 |  |  |
60-89 Days Past Due [Member] | PCI loans |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total Past Due | 7,750 |  | 6,979 |  |  |
60-89 Days Past Due [Member] | PCI loans | Residential Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total Past Due | 7,750 |  | 6,979 |  |  |
60-89 Days Past Due [Member] | PCI loans | Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total Past Due | 0 |  | 0 |  |  |
90 days or more Past Due [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total Past Due | 367,849 |  | 445,056 |  |  |
90 days or more Past Due [Member] | Residential Portfolio Segment [Member] | Other Loans Member [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total Past Due | 146,108 |  | 161,851 |  |  |
90 days or more Past Due [Member] | Residential Portfolio Segment [Member] | Loans Insured or Guaranteed by US Government Authorities [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total Past Due | 89,687 |  | 104,751 |  |  |
90 days or more Past Due [Member] | Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total Past Due | 81,099 |  | 110,482 |  |  |
90 days or more Past Due [Member] | Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total Past Due | 22,646 |  | 35,385 |  |  |
90 days or more Past Due [Member] | Commercial Portfolio Segment [Member] | Construction Loans [Member] | Residential Mortgage [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total Past Due | 1,337 |  | 2,102 |  |  |
90 days or more Past Due [Member] | Commercial Portfolio Segment [Member] | Construction Loans [Member] | Commercial Loan [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total Past Due | 0 |  | 0 |  |  |
90 days or more Past Due [Member] | Commercial Portfolio Segment [Member] | Construction Loans [Member] | Land [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total Past Due | 5,821 |  | 6,327 |  |  |
90 days or more Past Due [Member] | Consumer Portfolio Segment [Member] | Other Loans Member [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total Past Due | 9,796 |  | 11,617 |  |  |
90 days or more Past Due [Member] | Consumer Portfolio Segment [Member] | Consumer Auto Loans [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total Past Due | 10,361 |  | 11,212 |  |  |
90 days or more Past Due [Member] | Consumer Portfolio Segment [Member] | Finance Lease [Member] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total Past Due | 994 |  | 1,329 |  |  |
90 days or more Past Due [Member] | PCI loans |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total Past Due | 27,023 |  | 29,444 |  |  |
90 days or more Past Due [Member] | PCI loans | Residential Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable, Past Due [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] |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total Past Due | $ 2,397 |  | $ 2,512 |  |  |

X
- Definition Recorded investment in financing receivables that are 90 days or more past due and still accruing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5111-111524 + Details
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- Definition Financing receivables that are current. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953401-111524 + Details
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- Definition Recorded Investment in financing receivables that are past due at the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953401-111524 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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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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