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Fair Value (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Other Repossessed Assets | $ 4,200,000 | $ 4,000,000.0 |  |
Discount percentage applied to real estate appraised values | 15.00% |  |  |
Discount percentage applied to lot development appraised values | 6.00% |  |  |
Mortgage loan servicing rights | $ 10,070,000 | 10,178,000 | $ 9,688,000 | $ 9,266,000
Servicing Asset at Fair Value, Amount | 5,800,000 | 1,200,000 |  |
Valuation Allowance for Impairment of Recognized Servicing Assets, Balance | 825,000 | 232,000 | 630,000 | $ 735,000
MSRs recorded at cost | 4,300,000 | 9,000,000.0 |  |
Valuation Allowance for Impairment of Recognized Servicing Assets, Additions (Deductions) for Expenses (Recoveries) | 593,000 | (398,000) | (105,000) |
Other real estate owned | $ 4,029,000 | $ 4,303,000 |  |
Percent of OREO held at fair value | 75.00% | 85.00% |  |
Estimated fair value of other real estate owned (OREO) | $ 3,000,000.0 | $ 3,700,000 |  |
OREO devaluations | 225,000 | 491,000 | 458,000 |
expense related to other repossessed assets | 0 | 269,000 | $ 0 |
Alternative Investment | 20,411,000 | 17,065,000 |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments | 8,500,000 | 6,100,000 |  |
Alternative Investment, income recognized | 4,800,000 | 1,400,000 |  |
Nonrecurring basis |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Other Repossessed Assets | 3,599,000 | 3,464,000 |  |
Servicing Asset at Fair Value, Amount | 5,797,000 | 1,169,000 |  |
Fair Value, Inputs, Level 3 [Member] | Nonrecurring basis |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Other Repossessed Assets | 3,599,000 | 3,464,000 |  |
Fair Value Measured at Net Asset Value Per Share [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Alternative Investment | $ 11,900,000 | $ 11,000,000.0 |  |

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- Definition Fair value of investment other than investment in equity security, investment in debt security and equity method investment. Includes, but is not limited to, investment in certain entities that calculate net asset value per share. Example includes, but is not limited to, investment in hedge fund, venture capital fund, private equity fund, and real estate partnership or fund. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 6A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=SL6742756-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 35 -Paragraph 54B -URI http://asc.fasb.org/extlink&oid=117332851&loc=SL7495116-110257 + Details
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