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Loan Servicing (Tables) | 12 Months Ended
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Dec. 31, 2017
Transfers And Servicing [Abstract] |
Summary of Principal Balance for Mortgage Loans | The principal balances of these loans at year-end are as follows:
|  | 2017 |  |  | 2016 |
Mortgage loan portfolio serviced for: |  |  |  |  |  |  |  |
FHLMC |  | $ | 179,253 |  |  | $ | 121,274 |
Summary of Activity for Mortgage Servicing Rights | Activity for mortgage servicing rights for years ended December 31, 2017, 2016 and 2015 are as follows:
|  | 2017 |  |  | 2016 |  |  | 2015 |
Servicing rights: |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | $ | 854 |  |  | $ | 453 |  |  | $ | 347 |
Additions |  |  | 701 |  |  |  | 611 |  |  |  | 166 |
Amortization to expense |  |  | (313 | ) |  |  | (210 | ) |  |  | (60 | )
Ending balance |  | $ | 1,242 |  |  | $ | 854 |  |  | $ | 453 |

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- Definition Tabular disclosure of activity in the balance of servicing assets subsequently measured at amortized cost. Includes, but is not limited to, beginning and ending balances, additions, disposals, and amortization. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=68078379&loc=d3e122739-111746 + Details
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