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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Summary Of Activity For Capitalized Mortgage Servicing Rights [Roll Forward]      
Balance, beginning of year $ 1,387 $ 1,391 $ 962
Additions 315 198 200
Servicing rights acquired 0 0 367
Amortization (207) (202) (138)
Balance, end of year $ 1,495 $ 1,387 $ 1,391