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Mortgage Servicing Rights (Tables) | 6 Months Ended
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Jun. 30, 2019
Schedule of estimated future amortization expense for mortgage servicing assets | ​
​ | ​ | ​ | ​
​ | ​ | Estimated
(dollars in thousands) |  | Amortization
Under one year | ​ | $ | 2,254
One to two years | ​ | ​ | 1,950
Two to three years | ​ | ​ | 1,687
Three to four years | ​ | ​ | 1,463
Four to five years | ​ | ​ | 1,269
Schedule of gross carrying values, accumulated amortization, and net carrying values of mortgage servicing assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, | ​ | December 31,
(dollars in thousands) |  | 2019 |  | 2018
Gross carrying amount | ​ | $ | 63,366 | ​ | $ | 63,342
Less: accumulated amortization | ​ | ​ | 48,793 | ​ | ​ | 47,187
Net carrying value | ​ | $ | 14,573 | ​ | $ | 16,155
Schedule of changes in amortized mortgage servicing assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended June 30, | ​ | Six Months Ended June 30,
(dollars in thousands) |  | 2019 |  | 2018 |  | 2019 |  | 2018
Balance at beginning of period | ​ | $ | 15,399 | ​ | $ | 18,659 | ​ | $ | 16,155 | ​ | $ | 13,196
Originations | ​ | ​ | 16 | ​ | ​ | 21 | ​ | ​ | 24 | ​ | ​ | 28
Purchases | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 6,444
Amortization | ​ | ​ | (842) | ​ | ​ | (1,020) | ​ | ​ | (1,606) | ​ | ​ | (2,008)
Balance at end of period | ​ | $ | 14,573 | ​ | $ | 17,660 | ​ | $ | 14,573 | ​ | $ | 17,660
Fair value of amortized MSRs at beginning of period | ​ | $ | 26,383 | ​ | $ | 29,048 | ​ | $ | 27,662 | ​ | $ | 21,697
Fair value of amortized MSRs at end of period | ​ | $ | 23,398 | ​ | $ | 28,344 | ​ | $ | 23,398 | ​ | $ | 28,344
Schedule of quantitative assumptions used in determining lower of cost or fair value of MSRs | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2019 | ​ | December 31, 2018 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | Weighted | ​ | ​ | ​ | ​ | ​ | ​ | Weighted | ​
​ |  | Range | ​ | Average | ​ | Range | ​ | Average | ​
Conditional prepayment rate | ​ | 9.57 | % | - | 22.35 | % | 10.01 | % | 7.86 | % | - | 19.26 | % | 8.31 | %
Life in years (of the MSR) | ​ | 2.16 | ​ | - | 6.85 | ​ | 6.44 | ​ | 3.43 | ​ | - | 7.68 | ​ | 7.19 | ​
Weighted-average coupon rate | ​ | 3.96 | % | - | 7.38 | % | 4.02 | % | 3.97 | % | - | 6.70 | % | 4.02 | %
Discount rate | ​ | 10.00 | % | - | 10.01 | % | 10.00 | % | 10.00 | % | - | 10.02 | % | 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=118948506&loc=d3e107207-111719 + Details
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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -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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- Definition Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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