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Benefit Plans | 6 Months Ended
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Jun. 30, 2019
Benefit Plans | ​ 17. Benefit Plans ​ The Company sponsors an unfunded supplemental executive retirement plan (“SERP”) for certain key executives. On March 11, 2019, the Company’s board of directors approved an amendment to the SERP to freeze the SERP. As a result of such amendment, effective July 1, 2019, there will be no new accruals of benefits, including service accruals. Existing benefits under the SERP, as of the effective date of the amendment described above, will otherwise continue in accordance with the terms of the SERP. ​ The following table sets forth the components of net periodic benefit cost for the Company’s pension and postretirement benefit plans for the three and six months ended June 30, 2019 and 2018: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Income line item where recognized in | ​ | Pension Benefits | ​ | Other Benefits
(dollars in thousands) | ​ | the consolidated statements of income |  | 2019 |  | 2018 |  | 2019 |  | 2018
Three Months Ended June 30, | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Service cost | ​ | Salaries and employee benefits | ​ | $ | 17 | ​ | $ | 174 | ​ | $ | 159 | ​ | $ | 213
Interest cost | ​ | Other noninterest expense | ​ | ​ | 2,044 | ​ | ​ | 1,795 | ​ | ​ | 206 | ​ | ​ | 184
Expected return on plan assets | ​ | Other noninterest expense | ​ | ​ | (1,195) | ​ | ​ | (1,239) | ​ | ​ | — | ​ | ​ | —
Prior service credit | ​ | Other noninterest expense | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (107) | ​ | ​ | (107)
Recognized net actuarial loss | ​ | Other noninterest expense | ​ | ​ | 1,564 | ​ | ​ | 1,609 | ​ | ​ | (76) | ​ | ​ | —
Total net periodic benefit cost | ​ | ​ | ​ | $ | 2,430 | ​ | $ | 2,339 | ​ | $ | 182 | ​ | $ | 290
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Six Months Ended June 30, | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Service cost | ​ | Salaries and employee benefits | ​ | $ | 34 | ​ | $ | 348 | ​ | $ | 318 | ​ | $ | 425
Interest cost | ​ | Other noninterest expense | ​ | ​ | 4,088 | ​ | ​ | 3,589 | ​ | ​ | 412 | ​ | ​ | 369
Expected return on plan assets | ​ | Other noninterest expense | ​ | ​ | (2,390) | ​ | ​ | (2,479) | ​ | ​ | — | ​ | ​ | —
Prior service credit | ​ | Other noninterest expense | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (214) | ​ | ​ | (214)
Recognized net actuarial loss | ​ | Other noninterest expense | ​ | ​ | 3,128 | ​ | ​ | 3,220 | ​ | ​ | (152) | ​ | ​ | —
Total net periodic benefit cost | ​ | ​ | ​ | $ | 4,860 | ​ | $ | 4,678 | ​ | $ | 364 | ​ | $ | 580
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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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