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Secondary Market Mortgage Activities - Summary of Activity for Capital Mortgage Servicing Rights (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Mortgage Banking [Abstract]      
Balance, beginning of year $ 962 $ 856 $ 904
Additions 200 380 240
Servicing rights acquired 367 0 0
Amortization (138) (274) (288)
Balance, end of year $ 1,391 $ 962 $ 856