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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of finite-lived intangible assets | The following table presents the gross carrying value of core deposit intangible assets and accumulated amortization as of December 31, 2017 and 2016:
($ in thousands) |  | December 31,
| 2017 |  | 2016
Gross balance |  | $ | 108,814 |  |  | $ | 108,814 |
Accumulated amortization |  | (87,760 | ) |  | (80,825 | )
Net carrying balance |  | $ | 21,054 |  |  | $ | 27,989 |
Schedule of estimated future amortization expense of the core deposit intangibles | The following table presents the estimated future amortization expense of core deposit intangibles for the five years succeeding December 31, 2017 and thereafter:
($ in thousands) |  | Amount
2018 |  | $ | 5,883 |
2019 |  | 4,864 |
2020 |  | 3,846 |
2021 |  | 2,833 |
2022 |  | 1,865 |
Thereafter |  | 1,763 |
Total |  | $ | 21,054 |

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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 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: 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=66006027&loc=d3e16265-109275 + Details
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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=66006027&loc=d3e16323-109275 + Details
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