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Components of Net Deferred Tax Asset (Liability) (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred Tax Assets: |  |
Allowance for loan losses | $ 40,584 | $ 45,611
Compensation and related benefit obligations | 19,401 | 19,693
Acquisition accounting and fair value adjustments on securities (including OTTI) |  | 6,728
Non-accrual interest | 624 | 431
Net operating loss carryforwards | 19,750 |
Other | 12,169 | 11,349
Gross deferred tax assets | 92,528 | 83,812
Deferred tax asset after valuation allowance | 92,528 | 83,812
Deferred Tax Liabilities: |  |
Amortizable intangibles | (2,480) | (2,263)
Acquisition accounting and fair value adjustments on securities (including OTTI) | (9,742) |
Mortgage servicing rights |  | (223)
Premises and equipment | (7,578) | (11,242)
Prepaid pension cost | (22,739) | (19,135)
Leases | (237,429) | (115,259)
Other | (13,991) | (14,800)
Gross deferred tax liabilities | (293,959) | (162,922)
Net deferred tax liability | $ (201,431) | $ (79,110)

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