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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		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Fair value of assets
Balance at beginning of period	$ 2,775	$ 2,145	$ 2,445	$ 2,482
Total gains or (losses) (realized/unrealized): Included in earnings	123	161	86	686
Total gains or (losses) (realized/unrealized): Included in other comprehensive income	0	0
Purchases	0	0
Sales	0	0
Issues	66	343	359	531
Settlements	0	0
Balance at end of period	$ 2,718	$ 2,327	$ 2,718	$ 2,327

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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 gain (loss) recognized in other comprehensive income (OCI) 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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Amount of sale 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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