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Goodwill and Other Intangible Assets, Summary of Core Deposit and Other Intangibles (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Summary of core deposit intangibles and other intangibles |  |  |  |  |
Amortization of other intangible assets | $ 2,168 | $ 496 | $ 3,693 | $ 1,009 |
Core Deposit Intangibles |  |  |  |  |
Summary of core deposit intangibles and other intangibles |  |  |  |  |
Gross carrying amount | 58,100 |  | 58,100 |  | $ 4,385
Accumulated amortization | (2,421) |  | (2,421) |  | (4,385)
Net Book Value | 55,679 |  | 55,679 |  | 0
Amortization of other intangible assets |  |  | 2,421 |  | 112
Adjustments to Core Deposits [Member] |  |  |  |  |
Summary of core deposit intangibles and other intangibles |  |  |  |  |
Additions during the period |  |  | 58,100 |  | 0
Other Intangible Assets |  |  |  |  |
Summary of core deposit intangibles and other intangibles |  |  |  |  |
Gross carrying amount | 44,931 |  | 44,931 |  | 34,572
Accumulated amortization | (20,262) |  | (20,262) |  | (18,992)
Net Book Value | $ 24,668 |  | 24,668 |  | 15,580
Additions during the period |  |  | 10,359 |  | 2,162
Amortization of other intangible assets |  |  | $ 1,270 |  | $ 1,847

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