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Core Deposits and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2014
Goodwill and Core Deposits and Other Intangible Assets [Abstract] |
Summary of carrying basis and accumulated amortization of recognized intangible assets |
|  |  | 2014 |  |  | 2013 |
| ($ in thousands) |  | Gross Carrying |  |  | Accumulated |  |  | Gross Carrying |  |  | Accumulated |
|  |  | Amount |  |  | Amortization |  |  | Amount |  |  | Amortization |
| Core deposits intangible |  | $ | 4,698 |  |  | $ | (4,473 | ) |  | $ | 4,698 |  |  | $ | (4,107 | )
| Customer relationship intangible |  |  | 200 |  |  |  | (142 | ) |  |  | 200 |  |  |  | (136 | )
| Banking intangibles |  |  | 4,898 |  |  |  | (4,615 | ) |  |  | 4,898 |  |  |  | (4,243 | )
| Purchased software - Banking |  |  | 1,289 |  |  |  | (943 | ) |  |  | 1,160 |  |  |  | (785 | )
| Purchased software - Data Processing/other |  |  | 235 |  |  |  | (206 | ) |  |  | 243 |  |  |  | (197 | )
| Purchased software |  |  | 1,524 |  |  |  | (1,149 | ) |  |  | 1,403 |  |  |  | (982 | )
| Total |  | $ | 6,422 |  |  | $ | (5,764 | ) |  | $ | 6,301 |  |  | $ | (5,225 | )
Summary of estimated amortization expense |
| ($ in thousands) |  | 2015 |  |  | 2016 |  |  | 2017 |  |  | 2018 |  |  | 2019 |
| Core deposit intangible |  | $ | 195 |  |  | $ | 8 |  |  | $ | 7 |  |  | $ | 5 |  |  | $ | 5 |
| Customer relationship intangible |  |  | 6 |  |  |  | 5 |  |  |  | 5 |  |  |  | 4 |  |  |  | 4 |
| Banking intangibles |  |  | 201 |  |  |  | 13 |  |  |  | 12 |  |  |  | 9 |  |  |  | 9 |
| Purchased software - Banking |  |  | 164 |  |  |  | 143 |  |  |  | 37 |  |  |  | 2 |  |  |  | - |
| Purchased software - Data Processing |  |  | 5 |  |  |  | 4 |  |  |  | 3 |  |  |  | 3 |  |  |  | 3 |
| Purchased Software |  |  | 169 |  |  |  | 147 |  |  |  | 40 |  |  |  | 5 |  |  |  | 3 |
| Total |  | $ | 370 |  |  | $ | 160 |  |  | $ | 52 |  |  | $ | 14 |  |  | $ | 12 |

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- Definition Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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