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Fair Value Schedule of qualitative information on Level 3 measurements (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Impaired loans carried at fair value | $ 2,090 | $ 6,399
Other Assets, Fair Value Disclosure | 6,426,869 | 5,570,136
Nonrecurring basis |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Other Assets, Fair Value Disclosure | 3,033 | 3,674
Nonrecurring basis | Residential real estate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Other Assets, Fair Value Disclosure | 738 | 650
Loans | Nonrecurring basis | Commercial Real Estate Portfolio Segment [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Impaired loans carried at fair value | 1,873 | 4,059
Loans | Nonrecurring basis | Residential real estate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Impaired loans carried at fair value | 217 | 705
Loans | Nonrecurring basis | Construction Real Estate Remaining Commercial [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Impaired loans carried at fair value |  | 1,635
Other real estate owned | Nonrecurring basis | Other Real Estate Owned, Commercial [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Other Assets, Fair Value Disclosure | 2,295 | 2,295
Other real estate owned | Nonrecurring basis | Other Real Estate Owned, Residential [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Other Assets, Fair Value Disclosure | $ 738 | 650
Other real estate owned | Nonrecurring basis | Other Real Estate Owned, Construction [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Other Assets, Fair Value Disclosure |  | $ 729

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