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Goodwill and Other Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of changes in the carrying amount of goodwill by reporting unit | The following table presents changes in the carrying amount of goodwill by reporting unit during the nine months ended September 30, 2019 and 2018:
($ in thousands) |  | Consumer and Business Banking |  | Commercial Banking |  | Total
Balance, January 1, 2018 |  | $ | 357,207 |  |  | $ | 112,226 |  |  | $ | 469,433 |
Disposition of the DCB branches |  | (3,886 | ) |  | — |  |  | (3,886 | )
Balance, September 30, 2018 |  | $ | 353,321 |  |  | $ | 112,226 |  |  | $ | 465,547 |
Balance, January 1, 2019 |  | $ | 353,321 |  |  | $ | 112,226 |  |  | $ | 465,547 |
Acquisition of Enstream Capital Markets, LLC |  | — |  |  | 150 |  |  | 150 |
Balance, September 30, 2019 |  | $ | 353,321 |  |  | $ | 112,376 |  |  | $ | 465,697 |
Schedule of gross carrying value of core deposit intangible assets and accumulated amortization | The following table presents the gross carrying amount of core deposit intangible assets and accumulated amortization as of September 30, 2019 and December 31, 2018:
($ in thousands) |  | September 30, 2019 |  | December 31, 2018
Gross balance (1) |  | $ | 86,099 |  |  | $ | 86,099 |
Accumulated amortization (1) |  | (75,044 | ) |  | (71,570 | )
Net carrying balance (1) |  | $ | 11,055 |  |  | $ | 14,529 |
(1) Excludes fully amortized core deposit intangible assets.
Schedule of estimated future amortization expense of core deposit intangibles | The following table presents the estimated future amortization expense of core deposit intangibles as of September 30, 2019:
($ in thousands) |  | Amount
Remainder of 2019 |  | $ | 1,044 |
2020 |  | 3,634 |
2021 |  | 2,749 |
2022 |  | 1,865 |
2023 |  | 1,199 |
Thereafter |  | 564 |
Total |  | $ | 11,055 |

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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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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 goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13854-109267 + 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://fasb.org/us-gaap/role/ref/legacyRef -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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