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Components of Net Deferred Tax Asset (Liability) (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Deferred Tax Assets: |  |
Allowance for loan losses | $ 73,835 | $ 74,508
Compensation and related benefit obligations | 31,112 | 29,876
Acquisition accounting and fair value adjustments on securities (including OTTI) | 13,970 | 89
Acquisition accounting adjustments on borrowed funds |  | 5,203
Non-accrual interest | 6,107 | 7,917
Restructuring and retirement of borrowed funds | 16,545 |
Net operating loss carryforwards | 16,675 |
Other | 19,723 | 21,535
Gross deferred tax assets | 177,967 | 139,128
Valuation allowance | 0 | 0
Deferred tax asset after valuation allowance | 177,967 | 139,128
Deferred Tax Liabilities: |  |
Amortizable intangibles | (1,379) | (1,967)
Acquisition accounting and fair value adjustments on loans (including the FDIC loss share receivable) | (1,094) | (18,336)
Mortgage servicing rights | (53,370) | (47,966)
Premises and equipment | (20,120) | (22,714)
Prepaid pension cost | (27,056) | (26,607)
Restructuring and retirement of borrowed funds |  | (3,111)
Leases | (50,658) | (24,117)
Other | (12,281) | (14,576)
Gross deferred tax liabilities | (165,958) | (159,394)
Net deferred tax asset | $ 12,009 |
Net deferred tax (liability) |  | $ (20,266)

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