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Activity in Allowance for Loan Losses (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017 | [1]
Valuation Allowance [Line Items] |  |
Balance, beginning of period | $ 158,046 | $ 158,290
Charge-offs | (6,991) | (5,830)
Recoveries | 514 | 203
Balance, end of period | 161,140 | 154,450
Non-Covered Loans |  |
Valuation Allowance [Line Items] |  |
Provision for (recovery of) non-covered loan losses | 9,571 | 1,787
Mortgage Receivable |  |
Valuation Allowance [Line Items] |  |
Balance, beginning of period | 128,275 | 125,416
Charge-offs | (5,411) |
Recoveries | 110 | 115
Balance, end of period | 129,135 | 121,852
Mortgage Receivable | Non-Covered Loans |  |
Valuation Allowance [Line Items] |  |
Provision for (recovery of) non-covered loan losses | 6,161 | (3,679)
Other loans |  |
Valuation Allowance [Line Items] |  |
Balance, beginning of period | 29,771 | 32,874
Charge-offs | (1,580) | (5,830)
Recoveries | 404 | 88
Balance, end of period | 32,005 | 32,598
Other loans | Non-Covered Loans |  |
Valuation Allowance [Line Items] |  |
Provision for (recovery of) non-covered loan losses | $ 3,410 | $ 5,466
[1] | Represents allowance for losses on non-covered loans, excluding PCI loans.

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- Definition Provision Recoveries For Loan Losses + References No definition available. + Details
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- Definition Amount of recovery of financing receivables doubtful of collection that were previously charged off. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Amount of direct write-downs of financing receivables charged against the allowance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 + 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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