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Income Taxes - Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deferred tax assets:    
Allowance for loan losses $ 14,884 $ 23,852
Post-retirement benefit 7,265 11,150
Deferred compensation 1,382 2,447
Purchase accounting adjustments 1,242 1,979
Depreciation 2,284 4,025
SERP 651 966
ESOP 2,000 3,203
Stock-based compensation 4,066 5,259
Non-accrual interest 839 3,738
Unrealized loss on securities 1,180 350
State NOL 18 81
Federal NOL 270 742
Pension liability adjustments 1,495 2,051
Other 2,561 1,817
Total gross deferred tax assets 40,137 61,660
Deferred tax liabilities:    
Deferred REIT dividend 22,264 0
Pension expense 6,857 10,255
Deferred loan costs 4,043 5,477
Investment securities, principally due to accretion of discounts 79 167
Intangibles 775 548
Originated mortgage servicing rights 184 313
Total gross deferred tax liabilities 34,202 16,760
Net deferred tax asset $ 5,935 $ 44,900