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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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