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Mortgage Banking and Servicing Rights (Tables) | 12 Months Ended
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Dec. 31, 2017
Mortgage Banking and Servicing Rights [Abstract] |
Summary of mortgage servicing rights capitalized and related amortization |
($ in thousands) |  | 2017 |  |  | 2016 |
Carrying amount, beginning of year |  | $ | 8,422 |  |  | $ | 7,152 |
Mortgage servicing rights capitalized during the year |  |  | 2,540 |  |  |  | 2,542 |
Mortgage servicing rights amortization during the year |  |  | (1,132 | ) |  |  | (1,340 | )
Net change in valuation allowance |  |  | 77 |  |  |  | 68 |
Carrying amount, end of year |  | $ | 9,907 |  |  | $ | 8,422 |
Valuation allowance: |  |  |  |  |  |  |  |
Beginning of year |  | $ | 228 |  |  | $ | 296 |
Reduction |  |  | (77 | ) |  |  | (68 | )
End of year |  | $ | 151 |  |  | $ | 228 |
Fair Value, beginning of period |  | $ | 9,656 |  |  | $ | 7,760 |
Fair Value, end of period |  | $ | 11,338 |  |  | $ | 9,656 |

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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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