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Mortgage Servicing Rights (Tables) | 9 Months Ended
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Sep. 30, 2023
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, with adjustments to the carrying value included in mortgage banking income on the consolidated statements of income:
| Three months ended September 30 |  | Nine months ended September 30
| 2023 |  | 2022 |  | 2023 |  | 2022
| (dollars in thousands)
Amortized cost: |  |  |  |  |  |  |
Balance at beginning of period | $ | 32,458 |  |  | $ | 35,249 |  |  | $ | 34,217 |  |  | $ | 35,993 |
Originations of MSRs | 1,083 |  |  | 1,051 |  |  | 1,967 |  |  | 3,459 |
Amortization | (1,193) |  |  | (1,360) |  |  | (3,836) |  |  | (4,512) |
Balance at end of period | $ | 32,348 |  |  | $ | 34,940 |  |  | $ | 32,348 |  |  | $ | 34,940 |
Valuation allowance: |  |  |  |  |  |  |
Balance at beginning of period | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | (600) |
Reduction (addition) to valuation allowance | — |  |  | — |  |  | — |  |  | 600 |
Balance at end of period | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Net MSRs at end of period | $ | 32,348 |  |  | $ | 34,940 |  |  | $ | 32,348 |  |  | $ | 34,940 |
Estimated fair value of MSRs at end of period | $ | 51,523 |  |  | $ | 51,072 |  |  | $ | 51,523 |  |  | $ | 51,072 |

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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 -Topic 860 -SubTopic 50 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481229/860-50-50-4 + Details
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Balance Type: | na
Period Type: | duration

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