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Other assets - Components of Other Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Other assets.    
Other real estate owned $ 236 $ 393
Investment in residential housing program 8,194 8,312
Mortgage servicing rights 698 698
Bank owned life insurance 33,261 33,073
Restricted equity securities 6,781 7,051
Other assets 16,470 15,974
Total $ 65,640 $ 65,501