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Goodwill, Core Deposit Intangible and Other Intangible Assets - Summary of Changes in Goodwill, Core Deposit Intangible Assets and Customer Relationship Intangible Assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Schedule Of Goodwill And Intangible Assets [Line Items] |  |  |  |
Beginning balance, Goodwill | $ 148,353 | $ 145,638 | $ 148,353 | $ 128,177
Additions |  |  |  | 17,461
Ending balance, Goodwill | 148,353 | 145,638 | 148,353 | 145,638
Amortization | (1,947) | (2,003) | (5,732) | (5,735)
Core Deposits |  |  |  |
Schedule Of Goodwill And Intangible Assets [Line Items] |  |  |  |
Beginning balance | 25,459 | 32,982 | 29,111 | 30,360
Additions |  |  |  | 6,220
Amortization | (1,825) | (1,936) | (5,477) | (5,534)
Ending balance | 23,634 | 31,046 | 23,634 | 31,046
Accumulated amortization | $ 31,832 | $ 24,420 | $ 31,832 | $ 24,420
Weighted average remaining amortization period | 5 years 9 months 18 days | 6 years 8 months 12 days | 5 years 9 months 18 days | 6 years 8 months 12 days
Customer Relationships |  |  |  |
Schedule Of Goodwill And Intangible Assets [Line Items] |  |  |  |
Beginning balance | $ 2,658 | $ 2,926 | $ 2,791 | $ 3,059
Amortization | (122) | (67) | (255) | (200)
Ending balance | 2,536 | 2,859 | 2,536 | 2,859
Accumulated amortization | $ 680 | $ 358 | $ 680 | $ 358
Weighted average remaining amortization period | 9 years 8 months 12 days | 10 years 8 months 12 days | 9 years 8 months 12 days | 10 years 8 months 12 days

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- Definition Schedule of Goodwill and Intangible Assets [Line Items], + References No definition available. + Details
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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=118932676&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 Accumulated amount of 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 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 Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + 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)(1),(b)) -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 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 + Details
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