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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
	Mar. 31, 2021	Mar. 31, 2020
Fair value of assets
Balance at beginning of period	$ 2,445	$ 2,482
Total (losses) or gains (realized/unrealized): Included in earnings	121	275
Total (losses) or gains (realized/unrealized): Included in other comprehensive income	0	0
Purchases	0	0
Sales	0	0
Issues	170	67
Settlements	0	0
Balance at end of period	$ 2,494	$ 2,274

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Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3).

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Amount of issuances of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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