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GOODWILL (Tables) | 3 Months Ended
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Mar. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes in Carrying Amount of Goodwill | Changes in the carrying amount of goodwill for the three months ended March 31, 2022 and March 31, 2021 were as follows:
|  |  |  | Three months ended
|  |  |  | March 31,
(Dollars in thousands) |  |  |  |  |  | 2022 |  | 2021
Balance at beginning of period |  |  |  |  |  | $ | 1,000,749 |  |  | $ | 937,771 |
Goodwill resulting from business combinations |  |  |  |  |  | (790) |  |  | 0 |
Balance at end of period |  |  |  |  |  | $ | 999,959 |  |  | $ | 937,771 |
Finite-Lived Intangible Assets [Line Items] |
Schedule of Finite-Lived Intangible Assets [Table Text Block] |
(Dollars in thousands) |  | March 31, 2022 |  | December 31, 2021
|  | Gross carrying amount |  | Accumulated amortization |  | Gross carrying amount |  | Accumulated amortization
Amortized intangible assets |  |  |  |  |  |  |  |
Core deposit intangibles |  | $ | 45,256 |  |  | $ | (27,710) |  |  | $ | 45,256 |  |  | $ | (26,911) |
Customer list |  | 69,563 |  |  | (9,886) |  |  | 69,563 |  |  | (8,362) |
Other |  | 14,589 |  |  | (5,921) |  |  | 14,589 |  |  | (5,237) |
Total |  | $ | 129,408 |  |  | $ | (43,517) |  |  | $ | 129,408 |  |  | $ | (40,510) |

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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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