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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
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)