Mortgage Servicing Rights - Estimated Future Amortization Expenses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Other Intangible Assets
Unpaid principal amount of consumer loans serviced for others	$ 1,500,000		$ 1,500,000		$ 1,700,000
Contractually specified fees, late charges, and ancillary fees	1,000	$ 1,200	2,000	$ 2,500
Amortization of mortgage servicing rights	518	$ 1,283	1,255	$ 1,829
Details of MSRs
Gross carrying amount	69,207		69,207		69,103
Less: accumulated amortization	62,055		62,055		60,801
Net carrying value	7,152		7,152		$ 8,302
Mortgage servicing assets
Estimated future amortization expenses for MSRs over the next five years
Under one year	1,075		1,075
One to two years	942		942
Two to three years	826		826
Three to four years	722		722
Four to five years	$ 632		$ 632