Borrowings - Narrative (Details) $ in Thousands	Jun. 30, 2023 USD ($) securities	Dec. 31, 2022 USD ($)
Debt Instrument [Line Items]
FHLB and FRB borrowings	$ 2,260,000	$ 865,000
Percent of assets	25.00%
Percent outstanding advances	100.00%
Unsecured Federal Funds lines
Debt Instrument [Line Items]
FHLB and FRB borrowings	$ 0	0
Qualifying Loans
Debt Instrument [Line Items]
Asset balance used to determine maximum borrowing capacity from federal reserve bank	$ 732,400
FRB Discount Window
Debt Instrument [Line Items]
Percent of qualifying assets (up to)	99.00%
Securities pledged as collateral	$ 220,700
Investment securities, pledged	$ 1,710,000
Number of securities pledged as collateral \| securities	87
Mortgage Loans on Real Estate
Debt Instrument [Line Items]
Pledged as collateral, FHLB	$ 8,120,000	$ 8,080,000

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