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Investment Securities Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2021 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Schedule of Investments [Line Items] |  |  |  |
Amortized cost |  | $ 3,009,064 |  |
Available-for-sale Securities, Fair Value Disclosure |  | 3,097,375 |  | $ 3,062,143
HTM, at amortized cost |  | 824,283 |  | 278,281
HTM securities |  | 826,932 |  |
Proceeds from sales of AFS securities |  | 125,811 | $ 187,819 |
Debt extinguishment costs | $ 32,200 |  |  |
Debt extinguishment costs | 841 |  |  |
Marketable Securities, Unrealized Gain (Loss) | (400) |  |  |
Visa |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Gain on sale of shares | 34,000 | 34,000 |  |
Residential Mortgage Backed Securities [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized cost |  | 201,654 |  | 373,779
Available-for-sale Securities, Fair Value Disclosure |  | 201,547 |  | 377,998
HTM, at amortized cost |  | 439,220 |  | 278,281
HTM securities |  | 449,671 |  | 296,857
US States and Political Subdivisions Debt Securities [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized cost |  | 1,002,146 |  | 891,327
Available-for-sale Securities, Fair Value Disclosure |  | 1,055,462 |  | 952,613
Auction Rate Securities [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized cost |  | 76,350 |  | 101,510
Available-for-sale Securities, Fair Value Disclosure |  | 74,834 |  | 98,206
Proceeds from sales of AFS securities | $ 24,600 |  |  |
Collateral Pledged [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Securities pledged as collateral |  | $ 2,000,000 |  | $ 520,500

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