Borrowed Funds - Additional Information (Details) - USD ($)			1 Months Ended			12 Months Ended
	May 28, 2021	Apr. 01, 2021	Jun. 30, 2021	Sep. 30, 2020	Aug. 31, 2016	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Weighted average interest rate for short-term borrowings						0.37%	0.38%
Payments of FHLB borrowings			$ 247,500,000
Prepaid long-term FHLB advances							$ 534,300,000
Callable FHLB advances interest rate							2.48%
Loss on extinguishment of debt						$ 8,406,000	$ 12,036,000	$ 31,995,000
FHLB advances callable for early redemption						0
Subordinated notes, interest rate	3.00%
Fair value of securities						$ 1,700,000,000	2,100,000,000
Derivative—interest rate swaps:
Debt Instrument [Line Items]
Notional amount of terminated derivative					$ 125,000,000
Derivative—interest rate swaps: | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Instrument [Line Items]
Subordinated debt basis points			2.187%
USAmeriBancorp, Inc.
Debt Instrument [Line Items]
Subordinated notes		$ 60,000,000
Subordinated notes, interest rate		6.25%
FHLB
Debt Instrument [Line Items]
Loss on extinguishment of debt							$ 9,700,000
Subordinated Debt
Debt Instrument [Line Items]
Subordinated debt initial term						5 years
Subordinated debt SOFR term						3 months
Subordinated Debt | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Instrument [Line Items]
Subordinated debt basis points						5.14%
Securities sold under agreements to repurchase
Debt Instrument [Line Items]
Weighted average interest rate for long-term borrowings							3.37%
FHLB
Debt Instrument [Line Items]
Weighted average interest rate for long-term borrowings						1.88%	2.02%
Effective interest rate			1.82%
Loss on extinguishment of debt						$ 8,400,000
Subordinated Notes Due September 2023
Debt Instrument [Line Items]
Effective interest rate					3.32%
Subordinated notes						$ 125,000,000
Subordinated notes, interest rate						5.125%
Net carrying value of subordinated debentures						$ 125,200,000	$ 130,500,000
Subordinated Notes Due June 2025
Debt Instrument [Line Items]
Subordinated notes						$ 100,000,000
Subordinated notes, interest rate						4.55%
Net carrying value of subordinated debentures						$ 99,600,000	99,500,000
Subordinated Notes Due June 2030
Debt Instrument [Line Items]
Subordinated notes						$ 115,000,000
Subordinated notes, interest rate						5.25%
Net carrying value of subordinated debentures						$ 113,400,000	113,300,000
Subordinated Notes Due June 2031
Debt Instrument [Line Items]
Subordinated notes			$ 300,000,000			$ 300,000,000
Subordinated notes, interest rate						3.00%
Net carrying value of subordinated debentures						$ 296,400,000
Subordinated Notes Due January 2022
Debt Instrument [Line Items]
Loss on extinguishment of debt							$ 2,400,000
Prepayment of long-term borrowings				$ 50,000,000
Long-term borrowing interest rate				3.70%
FHLB
Debt Instrument [Line Items]
Amount of hedged debt						$ 500,000,000