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Debt - Narrative (Details) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Maturity of federal funds purchased from correspondent banks	one business day
Real estate secured loans	$ 2,100,000,000
Current borrowing available	1,200,000,000
Maximum borrowing capacity	1,500,000,000
Long-term debt outstanding	4,501,000	$ 81,270,000
FHLB
Debt Instrument [Line Items]
Letter of credit outstanding, amount	$ 265,300,000	450,900,000
Paycheck Protection Program Liquidity Facility
Debt Instrument [Line Items]
Short-term borrowings, term	five years
Short-term borrowings, interest Rate	0.35%
Other Correspondent Banks
Debt Instrument [Line Items]
Outstanding drawings	$ 0	0
Line of credit facility, remaining borrowing capacity	35,000,000
Short term borrowings	0	0
FHLB Short-Term Borrowings
Debt Instrument [Line Items]
Outstanding drawings	$ 0	$ 0

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Amount of drawings outstanding on short-term borrowings.

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Maturity Of Federal Funds Purchased From Correspondent Banks

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Amount of advances or credit lines available from the Federal Home Loan Bank (FHLB).

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Amount of maximum advances or credit lines available from the Federal Home Loan Bank (FHLB).

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Including both current and noncurrent portions, Federal Home Loan Bank borrowings initially due beyond one year or beyond the normal operating cycle if longer.

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Description of the short-term debt arrangement, and disclosures pertaining to the underlying arrangements, including repayment terms, interest rates, restrictions on assets and activities, debt covenants, and other matters important to users of the financial statements.

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