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INCOME TAXES - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred tax assets: |  |
Allowance for credit losses and off-balance sheet credit exposure | $ 13,983 | $ 10,305
Net unrealized losses on securities |  | 343
Compensation and related benefit obligations | 1,674 | 2,368
Net deferred loan costs and fees | 2,588 |
Purchase accounting fair value adjustments | 3,574 | 4,735
Net change in pension and other post-retirement benefits plans | 3,608 | 2,809
Net operating loss carryforward | 786 | 3,229
Net loss on cash flow hedges | 1,905 | 304
Operating lease liabilities | 13,684 | 13,444
Other | 1,234 | 200
Total deferred tax assets | 43,036 | 37,737
Deferred tax liabilities: |  |
Pension and SERP expense | (5,366) | (4,904)
Net unrealized gains on securities | (1,285) |
Depreciation | (546) | (956)
REIT undistributed net income | (3,178) | (2,403)
Net deferred loan costs and fees |  | (2,413)
State and local taxes | (1,345) | (1,227)
Operating lease right-of-use assets | (13,172) | (12,934)
Other | (970) | (835)
Total deferred tax liabilities | (25,862) | (25,672)
Net deferred tax asset | $ 17,174 | $ 12,065

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