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Income Taxes - Summarized Deferred Tax Asset (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Deferred tax assets:    
Provision for loan losses $ 3,752 $ 3,433
Discount on purchased loans 1,842 2,916
Salary continuation plan 678 656
Mortgage servicing rights 95 115
Deferred compensation 52 107
Stock-based compensation 264 340
Unrealized loss on securities available for sale 0 586
Other 101 102
Deferred tax assets 6,784 8,255
Deferred tax liabilities:    
FHLB stock dividends (108) (162)
Accumulated depreciation (2,974) (3,298)
Intangible assets (858) (1,135)
Premium on investment securities acquired 0 (88)
Unrealized gain on securities available for sale (184) 0
NMTC (48) (24)
Other (96) (161)
Deferred tax liabilities (4,268) (4,868)
Net deferred tax asset $ 2,516 $ 3,387