Allowance for Loan Losses - Recorded Investment of Loan Sales (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Financing Receivable, Impaired [Line Items]
Amount of loan sales	$ 117,014	$ 71,639	$ 267,765
Real estate loans
Financing Receivable, Impaired [Line Items]
Amount of loan sales	11,243	0	23,475
Commercial loans
Financing Receivable, Impaired [Line Items]
Amount of loan sales	102,247	65,386	236,373
Loans to financial institutions and acceptances
Financing Receivable, Impaired [Line Items]
Amount of loan sales	0	0	0
Consumer loans and overdrafts
Financing Receivable, Impaired [Line Items]
Amount of loan sales	$ 3,524	$ 6,253	$ 7,917