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Fair Value - Level 3 Fair Value Measurement Activity (Details) - Level 3 $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($) investment | Dec. 31, 2019 USD ($)
Collateralized Mortgage Obligations |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Number of investment transfers | investment | 2 |
Municipal Bond |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Number of investment transfers | investment | 1 |
Investment securities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance, beginning of year | $ 24,279 | $ 7,209
Unrealized gain (loss) included in OCI | (668) | (17)
Purchases | 0 | 17,619
Net discount accretion | 571 | 7
Principal payments | (10,571) | (539)
Transfers into Level 3 | 17,892 | 0
Balance, end of year | 31,503 | 24,279
Interest Rate lock commitments with customers |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance, beginning of year | 103 | 0
Total gain included in earnings | 570 | 103
Balance, end of year | $ 673 | $ 103

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- Definition Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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