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Goodwill and Other Intangible Assets (Tables) | 6 Months Ended
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Jun. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Summary of core deposit intangibles and other intangibles | For core deposit intangibles and other intangibles, changes in the gross carrying amount, accumulated amortization, and net book value were as follows.
| Six Months Ended June 30, 2018 |  | Year Ended December 31, 2017
| ($ in Thousands)
Core deposit intangibles |  |  |
Gross carrying amount | $ | 58,100 |  |  | $ | 4,385 |
Accumulated amortization | (2,421 | ) |  | (4,385 | )
Net book value | $ | 55,679 |  |  | $ | — |
Additions during the periods | $ | 58,100 |  |  | $ | — |
Amortization during the year | $ | 2,421 |  |  | $ | 112 |
Other intangibles |  |  |
Gross carrying amount | $ | 44,931 |  |  | $ | 34,572 |
Accumulated amortization | (20,262 | ) |  | (18,992 | )
Net book value | $ | 24,668 |  |  | $ | 15,580 |
Additions during the period | $ | 10,359 |  |  | $ | 2,162 |
Amortization during the year | $ | 1,270 |  |  | $ | 1,847 |
Summary of changes in balance of mortgage servicing rights asset and mortgage servicing rights valuation allowance | A summary of changes in the balance of the mortgage servicing rights asset and the mortgage servicing rights valuation allowance was as follows.
| Six Months Ended June 30, 2018 |  | Year Ended December 31, 2017
| ($ in Thousands)
Mortgage servicing rights
Mortgage servicing rights at beginning of period | $ | 59,168 |  |  | $ | 62,085 |
Additions from acquisition | 8,136 |  |  | — |
Additions | 4,502 |  |  | 7,167 |
Amortization | (4,649 | ) |  | (10,084 | )
Mortgage servicing rights at end of period | $ | 67,157 |  |  | $ | 59,168 |
Valuation allowance at beginning of period | (784 | ) |  | (609 | )
(Additions) recoveries, net | 607 |  |  | (175 | )
Valuation allowance at end of period | (177 | ) |  | (784 | )
Mortgage servicing rights, net | $ | 66,980 |  |  | $ | 58,384 |
Fair value of mortgage servicing rights | $ | 84,585 |  |  | $ | 64,387 |
Portfolio of residential mortgage loans serviced for others (“servicing portfolio”) | $ | 8,500,578 |  |  | $ | 7,646,846 |
Mortgage servicing rights, net to servicing portfolio | 0.79 | % |  | 0.76 | %
Mortgage servicing rights expense (a) | $ | 4,042 |  |  | $ | 10,259 |
(a) Includes the amortization of mortgage servicing rights and additions / recoveries to the valuation allowance of mortgage servicing rights, and is a component of mortgage banking, net in the consolidated statements of income
Summary of estimated future amortization expense | The following table shows the estimated future amortization expense for amortizing intangible assets. The projections of amortization expense are based on existing asset balances, the current interest rate environment, and prepayment speeds as of June 30, 2018. The actual amortization expense the Corporation recognizes in any given period may be significantly different depending upon acquisition or sale activities, changes in interest rates, prepayment speeds, market conditions, regulatory requirements, and events or circumstances that indicate the carrying amount of an asset may not be recoverable.
Estimated Amortization Expense | Core Deposit Intangibles |  | Other Intangibles |  | Mortgage Servicing Rights
| ($ in Thousands)
Six Months Ending December 31, 2018 | $ | 2,905 |  |  | $ | 1,563 |  |  | $ | 4,725 |
2019 | 5,810 |  |  | 2,828 |  |  | 9,150 |
2020 | 5,810 |  |  | 2,711 |  |  | 7,963 |
2021 | 5,810 |  |  | 2,687 |  |  | 6,906 |
2022 | 5,810 |  |  | 2,663 |  |  | 6,000 |
2023 | 5,810 |  |  | 2,644 |  |  | 5,228 |
Beyond 2023 | 23,724 |  |  | 9,571 |  |  | 27,185 |
Total Estimated Amortization Expense | $ | 55,679 |  |  | $ | 24,668 |  |  | $ | 67,157 |

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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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