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Investment Securities - Additional Information (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($) security shares	Jun. 30, 2020 USD ($) shares	Jun. 30, 2021 USD ($) security shares	Jun. 30, 2020 USD ($) shares	Dec. 31, 2020 USD ($)
Other Than Temporary Impairment Credit Losses Recognized In Earnings [Line Items]
Accrued interest receivable	$ 47,046		$ 47,046		$ 49,303
Carrying Value Of Investment Securities Pledged	$ 3,500,000		$ 3,500,000		3,600,000
Number of available for sale debt securities in unrealized loss positions | security	174		174
Gross Gains on Sales of Investment Securities	$ 3,675	$ 14,180	$ 3,675	$ 14,257
Visa Class B Restricted Securities
Other Than Temporary Impairment Credit Losses Recognized In Earnings [Line Items]
Conversion ratio			0.016228
Gross Gains on Sales of Investment Securities		$ 14,200
Equity securities remaining, shares | shares	0	80,214	0	80,214
Available-for-sale Securities
Other Than Temporary Impairment Credit Losses Recognized In Earnings [Line Items]
Accrued interest receivable	$ 8,500		$ 8,500		6,600
Held-to-maturity Securities
Other Than Temporary Impairment Credit Losses Recognized In Earnings [Line Items]
Accrued interest receivable	$ 7,300		$ 7,300		$ 6,800

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The carrying value, as of the date of each statement of financial position presented, of investment securities, classified as available for sale or held to maturity, which are owned but transferred to serve as collateral to secure deposits of government entities and securities sold under agreements to repurchase, and payment of the related debt obligation, primarily a secured borrowing or repurchase agreement.

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Equity Securities, Shares

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The difference between the carrying value and the sale price of an investment. A gain would be recognized when the sale price of the investment is greater than the carrying value of the investment. This element refers to the Gain included in earnings and not to the cash proceeds of the sale.

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