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Fair Value Measurements - Mortgage Servicing Rights - Level 3 (Details) - Recurring - Significant Unobservable Inputs (Level 3) - Mortgage servicing rights (MSRs) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Fair value of assets |  |  |  |
Balance at beginning of period | $ 2,875 | $ 2,781 | $ 2,931 | $ 2,713
Total (losses) or gains (realized/unrealized): Included in earnings | (279) | (49) | (373) | (31)
Total (losses) or gains (realized/unrealized): Included in other comprehensive income | 0 | 0 |  |
Purchases | 0 | 0 |  |
Sales | 0 | 0 |  |
Issues | 61 | 81 | 99 | 131
Settlements | 0 | 0 |  |
Balance at end of period | $ 2,657 | $ 2,813 | $ 2,657 | $ 2,813

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