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Fair Value Measurements (Impaired Loans Remeasured and Reported at Fair Value of Underlying Collateral) (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Carrying value of impaired loans before allocations | $ 99,453 | $ 70,221 | $ 145,610
Specific valuation allowance allocations | (28,483) | (16,235) | (20,820)
Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Carrying value of impaired loans before allocations | 2,354 | 12,517 | 0
Specific valuation allowance allocations | (383) | (2,599) | 0
Fair value | 1,971 | 9,918 | 0
Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Carrying value of impaired loans before allocations | 65,176 | 22,688 | 75,435
Reversal of specific valuation allowance allocations |  | 9,260 |
Specific valuation allowance allocations | (18,019) |  | (19,533)
Fair value | $ 47,157 | $ 31,948 | $ 55,902

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- Definition Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953550-111524 + Details
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