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Other assets - Components of Other Assets (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Other real estate owned $ 334 $ 561
Investment in residential housing program 7,044 4,329
Mortgage servicing rights 566 676
Bank owned life insurance 30,374 29,983
Restricted equity securities 3,357 3,687
Other assets 14,785 13,830
Total $ 56,460 $ 53,066