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Mortgage Servicing Rights (Tables) | 9 Months Ended
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Sep. 30, 2021
Mortgage Servicing Rights |
Schedule of estimated future amortization expense for MSRs | ​
​ | ​ | ​ | ​
​ | ​ | Estimated
(dollars in thousands) |  | Amortization
Under one year | ​ | $ | 1,860
One to two years | ​ | ​ | 1,434
Two to three years | ​ | ​ | 1,142
Three to four years | ​ | ​ | 926
Four to five years | ​ | ​ | 763
Schedule of details of the Company's MSRs | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, | ​ | December 31,
(dollars in thousands) |  | 2021 |  | 2020
Gross carrying amount | ​ | $ | 69,062 | ​ | $ | 67,856
Less: accumulated amortization | ​ | ​ | 59,955 | ​ | ​ | 57,125
Net carrying value | ​ | $ | 9,107 | ​ | $ | 10,731
Schedule of changes in amortized MSRs | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended September 30, | ​ | Nine Months Ended September 30,
(dollars in thousands) |  | 2021 |  | 2020 |  | 2021 |  | 2020
Balance at beginning of period | ​ | $ | 10,007 | ​ | $ | 11,595 | ​ | $ | 10,731 | ​ | $ | 12,668
Originations | ​ | ​ | 101 | ​ | ​ | 729 | ​ | ​ | 1,206 | ​ | ​ | 2,935
Amortization | ​ | ​ | (1,001) | ​ | ​ | (1,402) | ​ | ​ | (2,830) | ​ | ​ | (4,681)
Balance at end of period | ​ | $ | 9,107 | ​ | $ | 10,922 | ​ | $ | 9,107 | ​ | $ | 10,922
Fair value of amortized MSRs at beginning of period | ​ | $ | 13,480 | ​ | $ | 15,159 | ​ | $ | 14,029 | ​ | $ | 20,329
Fair value of amortized MSRs at end of period | ​ | $ | 12,080 | ​ | $ | 14,282 | ​ | $ | 12,080 | ​ | $ | 14,282
Schedule of quantitative assumptions used in determining lower of cost or fair value of MSRs | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 2021 | ​ | December 31, 2020 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | Weighted | ​ | ​ | ​ | ​ | ​ | ​ | Weighted | ​
​ |  | Range | ​ | Average | ​ | Range | ​ | Average | ​
Conditional prepayment rate | ​ | 15.12 | % | - | 25.14 | % | 16.13 | % | 11.86 | % | - | 26.52 | % | 16.90 | %
Life in years (of the MSR) | ​ | 1.95 | ​ | - | 5.02 | ​ | 4.70 | ​ | 1.83 | ​ | - | 6.68 | ​ | 4.45 | ​
Weighted-average coupon rate | ​ | 3.60 | % | - | 6.65 | % | 3.73 | % | 3.24 | % | - | 6.98 | % | 3.84 | %
Discount rate | ​ | 10.00 | % | - | 10.01 | % | 10.00 | % | 10.00 | % | - | 10.00 | % | 10.00 | %

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- Definition Tabular disclosure of all information related to the key inputs and assumptions used in measuring the fair value of assets obtained or liabilities incurred, as the result of a sale of financial assets, relating to the transferor's continuing involvement, if any, at the time of securitization, asset-backed financing arrangement, or similar transfer (including at a minimum, but not limited to, and if applicable, quantitative information about discount rates, expected prepayments including the expected weighted-average life of prepayable financial assets, and anticipated credit losses, including expected static pool losses). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121570589&loc=d3e107207-111719 + Details
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