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Mortgage Servicing Rights | 3 Months Ended
--- | ---
Mar. 31, 2021
Transfers and Servicing [Abstract] |
Mortgage Servicing Rights | 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 March 31 |  |
| 2021 |  | 2020 |  |  |  |
| (in thousands)
Amortized cost: |  |  |  |  |  |  |
Balance at beginning of period | $ | 38,745 |  |  | $ | 39,267 |  |  |  |  |
Originations of MSRs | 2,811 |  |  | 1,478 |  |  |  |  |
Amortization | (3,753) |  |  | (1,891) |  |  |  |  |
Balance at end of period | $ | 37,803 |  |  | $ | 38,854 |  |  |  |  |
Valuation allowance: |  |  |  |  |  |  |
Balance at beginning of period | $ | (10,500) |  |  | $ | — |  |  |  |  |
Reduction (addition) to valuation allowance | 6,100 |  |  | (1,100) |  |  |  |  |
Balance at end of period | $ | (4,400) |  |  | $ | (1,100) |  |  |  |  |
Net MSRs at end of period | $ | 33,403 |  |  | $ | 37,754 |  |  |  |  |
MSRs represent the economic value of contractual rights to service mortgage loans that have been sold. The total portfolio of mortgage loans serviced by the Corporation for unrelated third parties was $4.6 billion and $4.7 billion as of March 31, 2021 and December 31, 2020, respectively. Actual and expected prepayments of the underlying mortgage loans can impact the fair values of the MSRs. The Corporation accounts for MSRs at the lower of amortized cost or fair value. The fair value of MSRs is estimated by discounting the estimated cash flows from servicing income, net of expense, over the expected life of the underlying loans at a discount rate commensurate with the risk associated with these assets. Expected life is based on the contractual terms of the loans, as adjusted for prepayment projections. The fair values of MSRs were $33.4 million and $28.2 million at March 31, 2021 and December 31, 2020, respectively. Based on its fair value analysis as of March 31, 2021, the Corporation determined that a $6.1 million reduction to the valuation allowance was required for the three months ended March 31, 2021, resulting in a total valuation allowance of $4.4 million as of March 31, 2021. The decrease to the valuation allowance was recorded as an increase to mortgage banking income on the consolidated statements of income for the three months ended March 31, 2021.

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- Definition The entire disclosure for a transferor's continuing involvement in financial assets that it has transferred in a securitization or asset-backed financing arrangement, the nature of any restrictions on assets reported by an entity in its statement of financial position that relate to a transferred financial asset (including the carrying amounts of such assets), how servicing assets and servicing liabilities are reported, and (for securitization or asset-backed financing arrangements accounted for as sales) when a transferor has continuing involvement with the transferred financial assets and transfers of financial assets accounted for as secured borrowings, how the transfer of financial assets affects an entity's financial position, financial performance, and cash flows. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (c)(3) -URI 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