Non Purchased Loans - Narrative (Details)	6 Months Ended
	Jun. 30, 2022 USD ($) loan	Jun. 30, 2021 USD ($) loan	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Loans and Allowance for Loan Losses (Additional Textual) [Abstract]
Outstanding balance of restructured loans	$ 10,437,613,000			$ 9,856,743,000
Troubled debt restructured that has subsequently defaulted	0	$ 0
Allowance for loan losses attributable to restructured loans	$ 166,131,000	$ 172,354,000	$ 166,468,000	$ 164,171,000	$ 173,106,000	$ 176,144,000
Non purchased loans and leases
Loans and Allowance for Loan Losses (Additional Textual) [Abstract]
Mortgage and commercial loans discontinued past due period	90 days
Consumer and other retail loans charged-off past due period	120 days
Nonperforming loans charged-off past due period	90 days
Number of restructured loans | loan	0	0
Restructured loans discontinued past due period	90 days	90 days
Troubled debt restructured that has subsequently defaulted	$ 258,000	$ 0
Remaining availability under commitments to lend additional funds on restructured loans	0	305,000
Non purchased loans and leases | Restructured loans
Loans and Allowance for Loan Losses (Additional Textual) [Abstract]
Outstanding balance of restructured loans	14,731,000	11,241,000
Allowance for loan losses attributable to restructured loans	$ 926,000	$ 612,000