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Income Taxes - Tax Effects of Temporary Differences on Deferred Tax Assets and Deferred Tax Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Income Tax Disclosure [Abstract] |  |
Allowance for credit losses | $ 11,858 | $ 7,512
Deferred compensation | 3,486 | 3,487
Supplemental retirement | 126 | 133
Core deposit premium and other intangible assets | 948 | 889
Deferred loan costs | 987 | 0
Stock compensation expense | 80 | 54
Deferred revenue | 460 | 521
Acquisition costs | 265 | 265
Other | 682 | 749
Total gross deferred tax assets | 18,892 | 13,610
Deferred expenses | 108 | 13
Intangibles amortization | 5,034 | 4,584
Prepaid expenses | 863 | 754
FHLB stock dividend | 23 | 23
Depreciation | 2,566 | 2,500
Purchase accounting | 7,937 | 7,906
Accumulated accretion | 135 | 304
Mortgage servicing rights | 148 | 411
Available-for-sale investment securities | 6,941 | 3,415
Total gross deferred tax liabilities | 23,755 | 19,910
Deferred Tax Liabilities, Net | $ (4,863) | $ (6,300)

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