Mortgage Servicing Rights - Summary of Carrying Value Under the Fair Value Measurement Method (Details) - Mortgage Servicing Rights - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Servicing Assets At Fair Value [Line Items]
Balance at Beginning of Period	$ 1,068	$ 1,212	$ 1,126	$ 1,290
Due to Payoffs	(50)	(38)	(108)	(116)
Total Changes in Fair Value of Mortgage Servicing Rights	(50)	(38)	(108)	(116)
Balance at End of Period	$ 1,018	$ 1,174	$ 1,018	$ 1,174