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Note Fair value measurement (Quantitative inputs level 3) (Detail) - USD ($) $ in Thousands | 9 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2016
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |
Trading Securities Debt |  | $ 37,731 | $ 33,926 |  |
Servicing Asset At Fair Value Amount |  | $ 162,779 | 168,031 | $ 180,157 | $ 196,889
Maximum |  |  |  |  |
Fair Value Inputs Quantitative Information [Abstract] |  |  |  |  |
Discount Rate |  | 13.93% |  |  |
Minimum |  |  |  |  |
Fair Value Inputs Quantitative Information [Abstract] |  |  |  |  |
Discount Rate |  | 11.42% |  |  |
Fair Value, Measurements, Recurring |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |
Trading Securities Debt |  | $ 37,731 | 33,746 |  |
Servicing Asset At Fair Value Amount |  | 162,779 | 168,031 |  |
Fair Value, Measurements, Nonrecurring |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |
Loans Receivable, Fair Value Disclosure | [1] | 79,347 |  |  |
Real Estate Acquired Through Foreclosure | [2] | 42,572 |  |  |
Mortgage Servicing Rights | Fair Value, Measurements, Recurring | Fair Value Inputs Level 3 Internal Valuation Technique |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |
Servicing Asset At Fair Value Amount |  | $ 162,779 |  |  |
Fair Value Inputs [Abstract] |  |  |  |  |
Fair Value Measurements, Valuation Techniques |  | Discounted cash flow model |  |  |
Unobservable Inputs |  | Prepayment speed / Weighted average life / Discount rate |  |  |
Mortgage Servicing Rights | Fair Value, Measurements, Recurring | Maximum | Fair Value Inputs Level 3 Internal Valuation Technique |  |  |  |  |
Fair Value Inputs Quantitative Information [Abstract] |  |  |  |  |
Prepayment speed |  | 16.90% |  |  |
Weighted average life (in years) |  | 16 years |  |  |
Discount Rate |  | 15.00% |  |  |
Mortgage Servicing Rights | Fair Value, Measurements, Recurring | Minimum | Fair Value Inputs Level 3 Internal Valuation Technique |  |  |  |  |
Fair Value Inputs Quantitative Information [Abstract] |  |  |  |  |
Prepayment speed |  | 0.10% |  |  |
Weighted average life (in years) |  | 1 month |  |  |
Discount Rate |  | 9.50% |  |  |
Mortgage Servicing Rights | Fair Value, Measurements, Recurring | Weighted Average | Fair Value Inputs Level 3 Internal Valuation Technique |  |  |  |  |
Fair Value Inputs Quantitative Information [Abstract] |  |  |  |  |
Prepayment speed |  | 5.30% |  |  |
Weighted average life (in years) |  | 8 years |  |  |
Discount Rate |  | 11.20% |  |  |
Loan | Fair Value, Measurements, Nonrecurring | Fair Value Inputs Level 3 Internal Valuation Technique |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |
Loans Receivable, Fair Value Disclosure | [3] | $ 66,710 |  |  |
Fair Value Inputs [Abstract] |  |  |  |  |
Fair Value Measurements, Valuation Techniques |  | External appraisal |  |  |
Unobservable Inputs |  | Haircut applied on external appraisals |  |  |
Loan | Fair Value, Measurements, Nonrecurring | Maximum | Fair Value Inputs Level 3 Internal Valuation Technique |  |  |  |  |
Fair Value Inputs Quantitative Information [Abstract] |  |  |  |  |
Haircut Applied On External Appraisal |  | 11.80% |  |  |
Loan | Fair Value, Measurements, Nonrecurring | Minimum | Fair Value Inputs Level 3 Internal Valuation Technique |  |  |  |  |
Fair Value Inputs Quantitative Information [Abstract] |  |  |  |  |
Haircut Applied On External Appraisal |  | 10.00% |  |  |
Loan | Fair Value, Measurements, Nonrecurring | Weighted Average | Fair Value Inputs Level 3 Internal Valuation Technique |  |  |  |  |
Fair Value Inputs Quantitative Information [Abstract] |  |  |  |  |
Haircut Applied On External Appraisal |  | 10.20% |  |  |
Other real estate owned | Fair Value, Measurements, Nonrecurring | Fair Value Inputs Level 3 Internal Valuation Technique |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |
Real Estate Acquired Through Foreclosure | [4] | $ 36,989 |  |  |
Fair Value Inputs [Abstract] |  |  |  |  |
Fair Value Measurements, Valuation Techniques |  | External appraisal |  |  |
Unobservable Inputs |  | Haircut applied on external appraisals |  |  |
Other real estate owned | Fair Value, Measurements, Nonrecurring | Maximum | Fair Value Inputs Level 3 Internal Valuation Technique |  |  |  |  |
Fair Value Inputs Quantitative Information [Abstract] |  |  |  |  |
Haircut Applied On External Appraisal |  | 30.00% |  |  |
Other real estate owned | Fair Value, Measurements, Nonrecurring | Minimum | Fair Value Inputs Level 3 Internal Valuation Technique |  |  |  |  |
Fair Value Inputs Quantitative Information [Abstract] |  |  |  |  |
Haircut Applied On External Appraisal |  | 15.00% |  |  |
Other real estate owned | Fair Value, Measurements, Nonrecurring | Weighted Average | Fair Value Inputs Level 3 Internal Valuation Technique |  |  |  |  |
Fair Value Inputs Quantitative Information [Abstract] |  |  |  |  |
Haircut Applied On External Appraisal |  | 23.80% |  |  |
Collateralized Mortgage Obligations | Fair Value, Measurements, Recurring |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |
Trading Securities Debt |  | $ 692 | 529 |  |
Collateralized Mortgage Obligations | Trading account securities | Fair Value, Measurements, Recurring | Fair Value Inputs Level 3 Internal Valuation Technique |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |
Trading Securities Debt |  | $ 644 |  |  |
Fair Value Inputs [Abstract] |  |  |  |  |
Fair Value Measurements, Valuation Techniques |  | Discounted cash flow model |  |  |
Unobservable Inputs |  | Weighted average life / Yield / Constant prepayment rate |  |  |
Collateralized Mortgage Obligations | Trading account securities | Fair Value, Measurements, Recurring | Maximum | Fair Value Inputs Level 3 Internal Valuation Technique |  |  |  |  |
Fair Value Inputs Quantitative Information [Abstract] |  |  |  |  |
Weighted Average Life |  | 2 years 2 months |  |  |
Yield |  | 4.20% |  |  |
Constant Prepayment Rate |  | 20.80% |  |  |
Collateralized Mortgage Obligations | Trading account securities | Fair Value, Measurements, Recurring | Minimum | Fair Value Inputs Level 3 Internal Valuation Technique |  |  |  |  |
Fair Value Inputs Quantitative Information [Abstract] |  |  |  |  |
Weighted Average Life |  | 1 year 4 months |  |  |
Yield |  | 3.70% |  |  |
Constant Prepayment Rate |  | 16.30% |  |  |
Collateralized Mortgage Obligations | Trading account securities | Fair Value, Measurements, Recurring | Weighted Average | Fair Value Inputs Level 3 Internal Valuation Technique |  |  |  |  |
Fair Value Inputs Quantitative Information [Abstract] |  |  |  |  |
Weighted Average Life |  | 1 year 11 months |  |  |
Yield |  | 3.80% |  |  |
Constant Prepayment Rate |  | 18.90% |  |  |
Other | Fair Value, Measurements, Recurring |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |
Trading Securities Debt |  | $ 3,476 | $ 3,517 |  |
Other | Trading account securities | Fair Value, Measurements, Recurring | Fair Value Inputs Level 3 Internal Valuation Technique |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |
Trading Securities Debt |  | $ 498 |  |  |
Fair Value Inputs [Abstract] |  |  |  |  |
Fair Value Measurements, Valuation Techniques |  | Discounted cash flow model |  |  |
Unobservable Inputs |  | Weighted average life / Yield / Constant prepayment rate |  |  |
Other | Trading account securities | Fair Value, Measurements, Recurring | Weighted Average | Fair Value Inputs Level 3 Internal Valuation Technique |  |  |  |  |
Fair Value Inputs Quantitative Information [Abstract] |  |  |  |  |
Weighted Average Life |  | 5 years 2 months |  |  |
Yield |  | 12.00% |  |  |
Constant Prepayment Rate |  | 10.80% |  |  |
[1] | Relates mostly to certain impaired collateral dependent loans. The impairment was measured based on the fair value of the collateral, which is derived from appraisals that take into consideration prices in observed transactions involving similar assets in similar locations, in accordance with the provisions of ASC Section 310-10-35 . Costs to sell are excluded from the reported fair value amount .
[2] | Represents the fair value of foreclosed real estate and other collateral owned that were written d own to their fair value. Costs to sell are excluded from the reported fair value amount.
[3] | Loans held-in-portfolio in which haircuts were not applied to external appraisals were excluded from this table.
[4] | Other real estate owned in which haircuts were not applied to external appraisals were excluded from this table.

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- Definition Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2196772 + Details
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