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Intangible Assets - Mortgage Servicing Rights (Details) - Mortgage servicing rights (MSRs) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Mortgage Servicing Rights |  |  |  |  |
Mortgage loans serviced for others | $ 286,600,000 | $ 273,800,000 | $ 286,600,000 | $ 273,800,000 | $ 292,700,000
Mortgage loan servicing fees reported as non-interest income | $ 193,000 | $ 234,000 | $ 386,000 | $ 422,000 |

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- Definition Represents the carrying amount of loans serviced for others by the reporting entity. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of contractually specified servicing fee, late fee, and ancillary fee recognized as income for servicing asset and servicing liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=116651436&loc=d3e122596-111746 + Details
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Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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