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Goodwill and Other Intangible Assets - Changes in Goodwill and Other Intangibles (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Finite-lived Intangible Assets [Roll Forward] |  |  |  |  |
Core deposit premiums, beginning of period |  |  | $ 111,110 |  |
Amortization of intangibles | $ (3,332) | $ (3,362) | (10,008) | $ (10,144) |
Total | 100,428 |  | 100,428 |  | $ 111,110
Core deposit premiums, end of period | 100,428 |  | 100,428 |  | 111,110
Core Deposit Premium |  |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |  |
Core deposit premiums, beginning of period |  |  | 97,363 | 111,808 | 111,808
Disposition of intangible asset |  |  | (674) |  | (2,324)
Amortization of intangibles |  |  | (8,978) |  | (12,121)
Total | 87,711 |  | 87,711 |  | 97,363
Core deposit premiums, end of period | 87,711 |  | 87,711 |  | 97,363
Books of Business Intangible |  |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |  |
Core deposit premiums, beginning of period |  |  | 13,747 | $ 15,532 | 15,532
Disposition of intangible asset |  |  | 0 |  | (413)
Amortization of intangibles |  |  | (1,030) |  | (1,372)
Total | 12,717 |  | 12,717 |  | 13,747
Core deposit premiums, end of period | $ 12,717 |  | $ 12,717 |  | $ 13,747

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 926 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=120154696&loc=d3e54445-107959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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