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GOODWILL AND OTHER INTANGIBLE ASSETS (Tables) | 12 Months Ended
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Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of changes in the carrying amount of goodwill | The following table presents the changes in the carrying amount of goodwill for segments with goodwill balances for the years ended December 31, 2015 and 2014:
($ in thousands) |  | Year Ended December 31,
| 2015 |  | 2014
| Retail Banking |  | Commercial Banking |  | Total |  | Retail Banking |  | Commercial Banking |  | Total
Beginning balance |  | $ | 357,207 |  |  | $ | 112,226 |  |  | $ | 469,433 |  |  | $ | 320,566 |  |  | $ | 16,872 |  |  | $ | 337,438 |
Addition from MetroCorp acquisition (1) |  | — |  |  | — |  |  | — |  |  | 36,641 |  |  | 95,354 |  |  | 131,995 |
Ending balance |  | $ | 357,207 |  |  | $ | 112,226 |  |  | $ | 469,433 |  |  | $ | 357,207 |  |  | $ | 112,226 |  |  | $ | 469,433 |
(1) | Includes $11.0 million of tax and BOLI adjustments recorded in the fourth quarter of 2014 due to the acquisition of MetroCorp, as discussed in Note 2 — Business Combination to the Consolidated Financial Statements.
Schedule of finite-lived intangible assets | The following table presents the gross carrying value of intangible assets and accumulated amortization for the years ended December 31, 2015 and 2014:
($ in thousands) |  | 2015 |  | 2014
Gross balance |  | $ | 108,814 |  |  | $ | 108,814 |
Accumulated amortization |  | 72,739 |  |  | 63,505 |
Net carrying balance |  | $ | 36,075 |  |  | $ | 45,309 |
Estimated future amortization expense | The following table presents the estimated future amortization expense of premiums on acquired deposits at December 31, 2015:
Year ended December 31, |  | Amount
|  | ($ in thousands)
2016 |  | $ | 8,086 |
2017 |  | 6,935 |
2018 |  | 5,883 |
2019 |  | 4,864 |
2020 |  | 3,846 |
Thereafter |  | 6,461 |
Total |  | $ | 36,075 |

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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=26713463&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=26713463&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 + Details
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