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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, 2015
Dec. 31, 2014
Dec. 31, 2013
Mortgage Banking [Abstract]      
Balance, beginning of year $ 856 $ 904 $ 714
Additions 380 240 350
Servicing rights acquired 0 0 83
Amortization (274) (288) (243)
Balance, end of year $ 962 $ 856 $ 904