Fair Value Measurements - Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans not covered under loss-share agreements	$ 6,466,000		$ 12,939,000
Specific reserve included in allowance for loan losses	166,468,000	$ 173,106,000	164,171,000	$ 176,144,000
Valuation adjustment	0	(13,561,000)
Changes in fair value, gain (loss)	(13,021,000)	$ 12,231,000
Impaired Loans, not covered
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Specific reserve included in allowance for loan losses	$ 3,355,000		$ 5,011,000