Mortgage Servicing Rights - Summary of Change in Balance of Mortgage Servicing Assets (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Servicing Asset at Fair Value, Amount [Roll Forward]
Beginning balance, at fair value	$ 3,113	$ 3,205	$ 3,239	$ 3,414
Servicing rights that result from transfers and sale of financial assets	849	111	1,523	388
Changes in fair value:
Due to changes in model inputs or assumptions and other	(623)	(90)	(1,423)	(576)
Ending balance, at fair value	$ 3,339	$ 3,226	$ 3,339	$ 3,226