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Goodwill and Intangible Assets (Tables) | 6 Months Ended
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Jun. 30, 2020
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): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | June 30, |  | December 31,
​ | ​ | 2020 | ​ | 2019
Goodwill: |  | ​ |  |  | ​ |
Balance, beginning of period | ​ | $ | 65,614 | ​ | $ | 66,087
Adjustment to values initially recorded for Acquisition of Foothills Bancorp, Inc. | ​ |  | — | ​ |  | (473)
Acquisition of PFG | ​ |  | 8,302 | ​ |  | —
Adjustment to values initially recorded for Acquisition of PFG | ​ | ​ | 229 | ​ | ​ | —
Balance, end of the period | ​ | $ | 74,145 | ​ | $ | 65,614
Schedule of Intangible Assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | June 30, |  | December 31,
​ | ​ | 2020 | ​ | 2019
Core deposit intangible: |  | ​ |  |  | ​ |
Balance, beginning of period | ​ | $ | 14,550 | ​ | $ | 14,550
Acquisition of PFG | ​ |  | 1,370 | ​ |  | —
Balance, gross core deposit intangible | ​ |  | 15,920 | ​ |  | 14,550
Less: accumulated amortization | ​ |  | (3,738) | ​ |  | (2,971)
Net core deposit intangible, net | ​ | $ | 12,182 | ​ | $ | 11,579
Schedule of Future Amortization Expense | The estimated aggregate amortization expense for future periods for core deposit intangibles is as follows (in thousands): ​
​ | ​ | ​ | ​
Remainder of 2020 |  | $ | 802
2021 | ​ |  | 1,570
2022 | ​ |  | 1,526
2023 | ​ |  | 1,485
2024 | ​ |  | 1,456
Thereafter | ​ |  | 5,343
Total | ​ | $ | 12,182

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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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