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Goodwill Goodwill (Tables) | 9 Months Ended
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Sep. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Intangible Assets and Goodwill [Table Text Block] | The following table sets forth the carrying value of goodwill and other intangible assets, net of accumulated amortization, at the dates indicated below:
| September 30, 2020 |  | December 31, 2019
| (Dollars in thousands)
Balances not subject to amortization |  |  |
Goodwill | $ | 506,206 |  |  | $ | 506,206 |
Balances subject to amortization |  |  |
Core deposit intangibles | 23,625 |  |  | 28,016 |
Other intangible assets | 918 |  |  | 1,270 |
Total other intangible assets | 24,543 |  |  | 29,286 |
Total goodwill and other intangible assets | $ | 530,749 |  |  | $ | 535,492 |

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- Definition Tabular disclosure of goodwill and intangible assets, which may be broken down by segment or major class. + 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 + Details
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