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Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2016
Gross Carrying and Accumulated Amortization Amounts of Core Deposit Intangibles and Mortgage Servicing Rights | The following table summarizes the gross carrying and accumulated amortization amounts of the Company’s CDI as of December 31, 2016:
(in thousands) |  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net Carrying Amount |
Core deposit intangibles |  | $ | 234,364 |  |  | $ | (234,156 | ) |  | $ | 208 |
Changes in Residential and Participation Mortgage Servicing Rights | The following table presents the changes in the balances of residential MSRs and participation MSRs for the years ended December 31, 2016 and 2015:
|  | For the Years Ended December 31, |
|  | 2016 |  |  | 2015(1) |
(in thousands) |  | Residential |  |  | Participation |  |  | Residential |  |  | Participation |
Carrying value, beginning of year |  | $ | 243,389 |  |  | $ | 4,345 |  |  | $ | 227,297 |  |  | $ | — |
Additions |  |  | 45,588 |  |  |  | 3,774 |  |  |  | 48,990 |  |  |  | 5,063 |
Increase (decrease) in fair value: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Due to changes in interest rates |  |  | 3,341 |  |  |  | — |  |  |  | 11,981 |  |  |  | — |
Due to model assumption changes (2) |  |  | (13,088 | ) |  |  | — |  |  |  | (1,506 | ) |  |  | — |
Due to loan payoffs |  |  | (33,425 | ) |  |  | — |  |  |  | (27,288 | ) |  |  | — |
Due to passage of time and other changes |  |  | (17,706 | ) |  |  | — |  |  |  | (16,085 | ) |  |  | — |
Amortization |  |  | — |  |  |  | (2,257 | ) |  |  | — |  |  |  | (718 | )
Carrying value, end of period |  | $ | 228,099 |  |  | $ | 5,862 |  |  | $ | 243,389 |  |  | $ | 4,345 |
(1) | The presentation of the 2015 amounts has been modified to conform with the 2016 presentation.
(2) | Represents changes in fair value driven by changes to the inputs to the valuation model related to assumed prepayment speeds.
Key Assumptions Used in Calculation of Fair Value of Residential Mortgage Servicing Rights | The following table presents the key assumptions used in calculating the fair value of the Company’s residential MSRs at the dates indicated:
|  | December 31, |
|  | 2016 |  |  | 2015 |
Expected weighted average life |  |  | 82 months |  |  |  | 92 months |
Constant prepayment speed |  |  | 8.70 | % |  |  | 7.35 | %
Discount rate |  |  | 10.05 |  |  |  | 10.01 |
Primary mortgage rate to refinance |  |  | 4.11 |  |  |  | 4.03 |
Cost to service (per loan per year): |  |  |  |  |  |  |  |
Current |  | $ | 64 |  |  | $ | 63 |
30-59 days or less delinquent |  |  | 214 |  |  |  | 213 |
60-89 days delinquent |  |  | 364 |  |  |  | 313 |
90-119 days delinquent |  |  | 464 |  |  |  | 413 |
120 days or more delinquent |  |  | 864 |  |  |  | 563 |

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- Definition Tabular disclosure of the characteristics, including initial carrying value, residual amount, weighted average useful life, of finite-lived intangible assets acquired during the period by major class. A major class is composed of intangible assets that can be grouped together because they are similar, either by nature or by their use in the operations of the company. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 the activity in the balance of servicing assets (including a description of where changes in fair value are reported in the statement of income for each period for which results of operations are presented), including but not limited to, the following: beginning and ending balances, additions (for instance, through purchases of servicing assets), disposals, changes in fair value during the period resulting from changes in inputs or assumptions used in the valuation model, other changes in fair value along with a description of those changes, and other changes that affect the balance along with a description of those changes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=68078379&loc=d3e122625-111746 + Details
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