Fair Value Measurements - Narrative (Details) - USD ($)	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 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	$ 14,774,000			$ 12,939,000
Specific reserve included in allowance for loan losses	174,356,000	$ 170,038,000	$ 166,131,000	164,171,000	$ 172,354,000	$ 176,144,000
Valuation adjustment	0	(13,561,000)
Changes in fair value, gain (loss)	14,537,000	$ 10,425,000
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	$ 2,667,000			$ 5,011,000