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Mortgage Servicing Rights (Tables) | 6 Months Ended
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Jun. 30, 2021
Transfers and Servicing [Abstract] |
Summary of Changes in Mortgage Servicing Rights | The following table summarizes the changes in MSRs, which are included in other assets on the consolidated balance sheets:
| Three months ended June 30 |  | Six months ended June 30
| 2021 |  | 2020 |  | 2021 |  | 2020
| (in thousands)
Amortized cost: |  |  |  |  |  |  |
Balance at beginning of period | $ | 37,803 |  |  | $ | 38,854 |  |  | $ | 38,745 |  |  | $ | 39,267 |
Originations of MSRs | 1,457 |  |  | 2,772 |  |  | 4,268 |  |  | 4,250 |
Amortization | (3,198) |  |  | (2,934) |  |  | (6,951) |  |  | (4,825) |
Balance at end of period | $ | 36,062 |  |  | $ | 38,692 |  |  | $ | 36,062 |  |  | $ | 38,692 |
Valuation allowance: |  |  |  |  |  |  |
Balance at beginning of period | $ | (4,400) |  |  | $ | (1,100) |  |  | $ | (10,500) |  |  | $ | — |
Reduction (addition) to valuation allowance | (2,200) |  |  | (6,600) |  |  | 3,900 |  |  | (7,700) |
Balance at end of period | $ | (6,600) |  |  | $ | (7,700) |  |  | $ | (6,600) |  |  | $ | (7,700) |
Net MSRs at end of period | $ | 29,462 |  |  | $ | 30,992 |  |  | $ | 29,462 |  |  | $ | 30,992 |

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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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=116651436&loc=d3e122739-111746 + Details
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Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_TransfersAndServicingAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration