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Regulatory Capital Requirements and Dividends From Subsidiaries - Narrative (Details) $ / shares in Units, shares in Thousands, $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Mar. 26, 2020 USD ($) | Mar. 12, 2020 USD ($) $ / shares shares | Dec. 31, 2021 USD ($) vote $ / shares | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |
Trust Preferred Securities |  |  | $ 128,100 | $ 128,500 |
Net proceeds from preferred stock issuance |  |  | 0 | 339,937 | $ 0
Dividends from subsidiaries |  |  | $ 173,091 | 229,700 | $ 149,800
Average Required Maintence Of Non Interst Bearing Reserve Balance | $ 75,000 |  |  |  |
Non-Cumulative Perpetual Preferred Stock, Series A [Member] |  |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |
Preferred Stock, dividend rate, percentage |  | 5.375% |  |  |
Preferred stock, par value (in dollars per share) | $ / shares |  | $ 0.01 |  |  |
Fixed-to-Floating Rate Subordinated Notes Due 2030 [Member] |  |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |
Preferred stock, Liquidation Preference Per Share | $ / shares |  | $ 25 | $ 25 |  |
Qualifying Subordinated Debentures [Member] |  |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |
Tier 2 capital |  |  | $ 350,000 | $ 377,500 |
Common Class A [Member] |  |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |
Votes per share of common stock | vote |  |  | 1 |  |
Class B Common Stock |  |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |
Votes per share of common stock | vote |  |  | 16 |  |
Depositary Shares, Each Representing a 1/40th Interest in a Share of 5.375% Non-Cumulative Perpetual Preferred Stock, Series A |  |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |
Stock Issued During Period, Shares, New Issues | shares |  | 13,800 |  |  |
Net proceeds from preferred stock issuance |  | $ 345,000 |  |  |
BancShares |  |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |
Capital Conservation Buffer |  |  |  | 6.35% |
FCB |  |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |
Capital Conservation Buffer |  |  |  | 5.85% |
Maintain Well-capitalized Banks, Additional Dividends Can Be Paid |  |  | $ 1,350,000 |  |

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