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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)