Income Taxes - Deferred tax assets and deferred tax liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred Tax Assets
Allowance for loan losses	$ 5,893	$ 5,566
Employee compensation and benefit accruals	2,542	2,167
Expense accruals	935	740
Identifiable intangible amortization	3,369	3,351
Deferred loan fees	266	462
Net operating loss carry forwards	236	266
Nonaccrual loan interest		143
Unrealized gain on available-for-sale investment securities		1,207
Other	341	533
Total deferred tax assets from temporary differences	13,582	14,435
Deferred Tax Liabilities
Accumulated depreciation	1,431	1,079
Goodwill and intangible amortization	1,835	1,443
Servicing assets	965	1,137
Prepaid expenses	804	644
Unrealized loss on available-for-sale investment securities	649
Other	7	47
Total deferred tax liabilities from temporary differences	5,691	4,350
Net Deferred Tax Assets	$ 7,891	$ 10,085