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Mortgage Servicing Rights (Tables) | 6 Months Ended
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Jun. 30, 2016
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 June 30 |  | Six months ended June 30
| 2016 |  | 2015 |  | 2016 |  | 2015
| (in thousands)
Amortized cost: |  |  |  |  |  |  |
Balance at beginning of period | $ | 40,195 |  |  | $ | 41,803 |  |  | $ | 40,944 |  |  | $ | 42,148 |
Originations of mortgage servicing rights | 1,508 |  |  | 1,956 |  |  | 2,428 |  |  | 3,513 |
Amortization | (1,829 | ) |  | (2,161 | ) |  | (3,498 | ) |  | (4,063 | )
Balance at end of period | $ | 39,874 |  |  | $ | 41,598 |  |  | $ | 39,874 |  |  | $ | 41,598 |
Valuation allowance: |  |  |  |  |  |  |
Balance at beginning of period | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Additions | (1,721 | ) |  | — |  |  | (1,721 | ) |  | — |
Balance at end of period | $ | (1,721 | ) |  | $ | — |  |  | $ | (1,721 | ) |  | $ | — |
Net MSRs at end of period | $ | 38,153 |  |  | $ | 41,598 |  |  | $ | 38,153 |  |  | $ | 41,598 |

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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=56950315&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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Period Type: | duration