Fair Value Measurement of Assets and Liabilities - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Collateral dependent loans charge offs	$ 4,500	$ 2,100
Collateral dependent impaired loans, recorded investment	104,400	74,600
Specific valuation allowance allocations	$ 69,100	$ 35,500
Valuation of loan servicing rights, discount rate	9.60%
Discount adjustment of the appraisals of foreclosed assets		0.00%
Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Valuation of loan servicing rights, prepayment rate	19.80%
Discount adjustment of the appraisals of foreclosed assets	1.50%
Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Discount adjustment of the appraisals of foreclosed assets	22.00%
Non-recurring fair value measurements: | Fair Value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Reported net carrying amount of impaired loans	$ 35,200	$ 39,100
Loan servicing rights	$ 15,603	$ 1,591