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Secondary Market Mortgage Activities - Summary of Activity for Capital Mortgage Servicing Rights (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Mortgage Banking [Abstract]      
Balance, beginning of year $ 714 $ 906 $ 909
Additions 350 85 249
Servicing rights acquired 83 0 0
Amortization (242) (277) (252)
Balance, end of year $ 905 $ 714 $ 906