Fair Value Measurements - Fair Value Nonrecurring Basis (Details) - Nonrecurring - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans and leases	$ 261,885	$ 141,199
Loan servicing rights	38,253	56,298
Other real estate owned	15,730	17,577
Repossessed and returned assets	10,077	6,968
Total assets at fair value	325,945	222,042
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans and leases	0	0
Loan servicing rights	0	0
Other real estate owned	0	0
Repossessed and returned assets	0	0
Total assets at fair value	0	0
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans and leases	0	0
Loan servicing rights	0	0
Other real estate owned	0	0
Repossessed and returned assets	10,077	6,968
Total assets at fair value	10,077	6,968
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans and leases	261,885	141,199
Loan servicing rights	38,253	56,298
Other real estate owned	15,730	17,577
Repossessed and returned assets	0	0
Total assets at fair value	$ 315,868	$ 215,074