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GOODWILL (Tables) | 6 Months Ended
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Jun. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes in Carrying Amount of Goodwill |
|  | Three months ended |  |  |  | Six months ended |  |
|  | June 30, |  |  |  | June 30, |  |
(Dollars in thousands) |  | 2020 |  | 2019 |  | 2020 |  | 2019
Balance at beginning of period |  | $ | 937,771 |  |  | $ | 879,727 |  |  | $ | 937,771 |  |  | $ | 880,251 |
Goodwill resulting from business combinations |  | 0 |  |  | 0 |  |  | 0 |  |  | (524) |
Balance at end of period |  | $ | 937,771 |  |  | $ | 879,727 |  |  | $ | 937,771 |  |  | $ | 879,727 |
Finite-Lived Intangible Assets [Line Items] |
Schedule of Finite-Lived Intangible Assets [Table Text Block] |
(Dollars in thousands) |  | June 30, 2020 |  |  |  | December 31, 2019 |  |
|  | Gross carrying amount |  | Accumulated amortization |  | Gross carrying amount |  | Accumulated amortization
Amortized intangible assets |  |  |  |  |  |  |  |
Core deposit intangibles |  | $ | 51,031 |  |  | $ | (24,337) |  |  | $ | 51,031 |  |  | $ | (21,149) |
Customer list |  | 39,420 |  |  | (2,986) |  |  | 39,420 |  |  | (1,195) |
Other |  | 10,093 |  |  | (2,896) |  |  | 10,093 |  |  | (1,999) |
Total |  | $ | 100,544 |  |  | $ | (30,219) |  |  | $ | 100,544 |  |  | $ | (24,343) |

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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=121556970&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=121556970&loc=d3e13854-109267 + Details
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