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Mortgage Servicing Rights (Tables) | 9 Months Ended
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Sep. 30, 2017
Transfers and Servicing [Abstract] |
Summary of Changes in Mortgage Servicing Rights | The following table summarizes the changes in mortgage servicing rights ("MSRs"), which are included in other assets on the consolidated balance sheets:
| Three months ended September 30 |  | Nine months ended September 30
| 2017 |  | 2016 |  | 2017 |  | 2016
| (in thousands)
Amortized cost: |  |  |  |  |  |  |
Balance at beginning of period | $ | 38,180 |  |  | $ | 39,874 |  |  | $ | 38,822 |  |  | $ | 40,944 |
Originations of mortgage servicing rights | 1,333 |  |  | 1,499 |  |  | 3,719 |  |  | 3,927 |
Amortization | (1,639 | ) |  | (2,064 | ) |  | (4,667 | ) |  | (5,562 | )
Balance at end of period | $ | 37,874 |  |  | $ | 39,309 |  |  | $ | 37,874 |  |  | $ | 39,309 |
Valuation allowance: |  |  |  |  |  |  |
Balance at beginning of period | $ | — |  |  | $ | (1,721 | ) |  | $ | (1,291 | ) |  | $ | — |
(Additions) reductions to valuation allowance | — |  |  | (1,280 | ) |  | 1,291 |  |  | (3,001 | )
Balance at end of period | $ | — |  |  | $ | (3,001 | ) |  | $ | — |  |  | $ | (3,001 | )
Net MSRs at end of period | $ | 37,874 |  |  | $ | 36,308 |  |  | $ | 37,874 |  |  | $ | 36,308 |

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- Definition Tabular disclosure of activity in the balance of servicing assets subsequently measured at amortized cost. Includes, but is not limited to, beginning and ending balances, additions, disposals, and amortization. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=68078379&loc=d3e122739-111746 + Details
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Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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