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Goodwill and Intangible Assets (Tables) | 3 Months Ended
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Mar. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | The carrying amount of goodwill and other intangible assets as of the dates indicated is summarized below (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | March 31, |  | December 31,
​ | ​ | 2021 | ​ | 2020
Goodwill: |  | ​ |  |  | ​ |
Balance, beginning of period | ​ | $ | 74,135 | ​ | $ | 65,614
Acquisition of PFG | ​ |  | 323 | ​ |  | 8,521
Balance, end of the period | ​ | $ | 74,458 | ​ | $ | 74,135
Finite-lived Intangible Assets Amortization Expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Core Deposit |  | Insurance Agency |  | Insurance Agency | ​ | ​ |
Amortized other intangible assets: | ​ | Intangibles | ​ | Customer Relationships | ​ | Tradename | ​ | Total | ​
Beginning balance January 1, 2021, gross | ​ | $ | 15,920 | ​ | $ | 1,064 | ​ | $ | 63 | ​ | $ | 17,047 | ​
Less: accumulated amortization | ​ | ​ | (4,935) | ​ | ​ | (206) | ​ | ​ | (14) | ​ | ​ | (5,155) | ​
Balance, March 31, 2021, other intangible assets, net | ​ | $ | 10,985 | ​ | $ | 858 | ​ | $ | 49 | ​ | $ | 11,892 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Beginning balance January 1, 2020 | ​ | $ | 14,550 | ​ | $ | - | ​ | $ | - | ​ | $ | 14,550 | ​
Acquisition of PFG | ​ | ​ | 1,370 | ​ | ​ | 1,064 | ​ | ​ | 63 | ​ | ​ | 2,497 | ​
Balance, December 31, 2020, other intangible assets, gross | ​ | ​ | 15,920 | ​ | ​ | 1,064 | ​ | ​ | 63 | ​ | ​ | 17,047 | ​
Less: accumulated amortization | ​ | ​ | (4,540) | ​ | ​ | (161) | ​ | ​ | (10) | ​ | ​ | (4,711) | ​
Balance, December 31, 2020, other intangible assets, net | ​ | $ | 11,380 | ​ | $ | 903 | ​ | $ | 53 | ​ | $ | 12,336 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense | The estimated aggregate amortization expense for future periods for core deposit intangibles is as follows (in thousands): ​
​ | ​ | ​ | ​
Remainder of 2021 |  | $ | 1,316
2022 | ​ |  | 1,697
2023 | ​ |  | 1,636
2024 | ​ |  | 1,588
2025 | ​ | ​ | 1,531
Thereafter | ​ |  | 4,124
Total | ​ | $ | 11,892

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