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Investment Securities Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Mar. 31, 2021	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Schedule of Investments [Line Items]
Amortized cost		$ 3,024,001
Available-for-sale Securities, Fair Value Disclosure		3,084,337		$ 3,062,143
HTM, at amortized cost		916,423		278,281
HTM securities		910,156
Proceeds from sales of AFS securities		125,811	$ 215,150
Marketable Securities, Unrealized Gain (Loss)	$ (400)
Visa
Schedule of Investments [Line Items]
Gain on sale of shares	34,000
Residential Mortgage Backed Securities [Member]
Schedule of Investments [Line Items]
Amortized cost		191,623		373,779
Available-for-sale Securities, Fair Value Disclosure		190,123		377,998
HTM, at amortized cost		410,189		278,281
HTM securities		417,478		296,857
US States and Political Subdivisions Debt Securities [Member]
Schedule of Investments [Line Items]
Amortized cost		1,111,024		891,327
Available-for-sale Securities, Fair Value Disclosure		1,150,394		952,613
Auction Rate Securities [Member]
Schedule of Investments [Line Items]
Amortized cost		76,350		101,510
Available-for-sale Securities, Fair Value Disclosure		75,133		98,206
Proceeds from sales of AFS securities	$ 24,600
Collateral Pledged [Member]
Schedule of Investments [Line Items]
Securities pledged as collateral		$ 2,600,000		$ 520,500

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