Fair Value Measurements - Fair Value of Assets Measured on Nonrecurring Basis (Details) - Nonrecurring - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Individually evaluated loans, net of allowance for credit losses	$ 7,928	$ 24,145
OREO	2,540	2,736
Mortgage servicing rights	89,018	62,994
Total financial assets	99,486	89,875
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Individually evaluated loans, net of allowance for credit losses	0	0
OREO	0	0
Mortgage servicing rights	0	0
Total financial assets	0	0
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Individually evaluated loans, net of allowance for credit losses	0	0
OREO	0	0
Mortgage servicing rights	0	0
Total financial assets	0	0
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Individually evaluated loans, net of allowance for credit losses	7,928	24,145
OREO	2,540	2,736
Mortgage servicing rights	89,018	62,994
Total financial assets	$ 99,486	$ 89,875