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Other assets - Components of Other Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Other assets.    
Other real estate owned $ 376 $ 284
Investment in low income housing partnership 7,377 7,842
Mortgage servicing rights 718 728
Bank owned life insurance 34,288 33,836
Restricted equity securities 7,462 8,562
Net deferred tax asset 5,081 3,906
Other assets 8,435 9,311
Total $ 63,737 $ 64,469