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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 loan losses | $ 12,827 | $ 7,231
Lease accounting | 10,537 | 1,647
Defined postretirement benefit obligation | 10,419 | 9,901
Accrued expenses | 2,896 | 2,562
Federal net operating loss carryforwards | 2,846 | 3,662
Stock compensation | 1,894 | 1,636
State income taxes | 1,142 | 954
California net operating loss carryforwards | 1,106 | 1,489
Premises and equipment | 459 | 695
Nonaccrual interest | 101 | 61
Split-dollar life insurance benefit plan | 80 | 75
Tax credit carryforwards | 57 | 57
Other | 469 | 654
Total deferred tax assets | 44,833 | 30,624
Deferred tax liabilities: |  |
Lease accounting | (10,537) | (1,647)
Loan fees | (1,820) | (1,842)
Securities available-for-sale | (1,764) | (772)
Intangible liabilities | (1,388) | (1,321)
Prepaid expenses | (689) | (289)
FHLB stock | (166) | (177)
I/O strips | (87) | (144)
Other | (161) | (130)
Total deferred tax liabilities | (16,612) | (6,322)
Net deferred tax assets | $ 28,221 | $ 24,302

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