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Other assets - Components of Other Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Other assets    
Other real estate owned $ 284 $ 393
Investment in low income housing partnership 7,842 8,312
Mortgage servicing rights 728 698
Bank owned life insurance 33,836 33,073
Restricted equity securities 8,562 7,051
Net deferred tax asset 3,906 5,571
Other assets 9,311 10,403
Total $ 64,469 $ 65,501