Fair Value Measurements - Fair Value Nonrecurring Basis (Details) - Nonrecurring - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Loans and leases	$ 592,133	$ 141,199
Loan servicing rights	38,303	56,298
Other real estate owned	14,575	17,577
Repossessed and returned assets	7,332	6,968
Total non-recurring fair value measurements	652,343	222,042
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Loans and leases	0	0
Loan servicing rights	0	0
Other real estate owned	0	0
Repossessed and returned assets	0	0
Total non-recurring fair value measurements	0	0
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Loans and leases	0	0
Loan servicing rights	0	0
Other real estate owned	0	0
Repossessed and returned assets	7,332	6,968
Total non-recurring fair value measurements	7,332	6,968
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Loans and leases	592,133	141,199
Loan servicing rights	38,303	56,298
Other real estate owned	14,575	17,577
Repossessed and returned assets	0	0
Total non-recurring fair value measurements	$ 645,011	$ 215,074