Servicing Assets and Liabilities - Changes in residential mortgage loans servicing rights (Details) - Residential mortgage servicing rights - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Servicing rights roll forward
Beginning of period	$ 16,216	$ 13,565	$ 11,877
Originated servicing rights capitalized upon sale of loans	12,510	11,911	5,783
Disposals	(4,275)	(2,868)	(1,098)
Changes in fair value due to change in inputs or assumptions used in the valuation	710	(6,392)	(2,997)
End of period	$ 25,161	$ 16,216	$ 13,565