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Components of Net Deferred Tax Asset (Liability) (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred Tax Assets: |  |
Allowance for loan losses | $ 46,239 | $ 75,605
Compensation and related benefit obligations | 13,010 | 27,877
Acquisition accounting and fair value adjustments on securities (including OTTI) |  | 14,455
Acquisition accounting and fair value adjustments on loans (including the FDIC loss share receivable) |  | 7,496
Non-accrual interest | 818 | 4,791
Restructuring and retirement of borrowed funds | 1,105 | 6,957
Net operating loss carryforwards | 2,967 | 5,664
Other | 15,953 | 18,351
Gross deferred tax assets | 80,092 | 161,196
Valuation allowance | 0 | 0
Deferred tax asset after valuation allowance | 80,092 | 161,196
Deferred Tax Liabilities: |  |
Amortizable intangibles | (1,704) | (1,655)
Acquisition accounting and fair value adjustments on securities (including OTTI) | (17,090) |
Undistributed earnings of subsidiaries | (19,003) |
Mortgage servicing rights | (1,794) | (65,975)
Premises and equipment | (12,907) | (19,310)
Prepaid pension cost | (24,324) | (30,962)
Leases | (78,682) | (65,214)
Other | (9,385) | (10,691)
Gross deferred tax liabilities | (164,889) | (193,807)
Net deferred tax asset (liability) | $ (84,797) | $ (32,611)

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