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Shareholders' Equity, Dividends Restrictions and Other Regulatory Matters (Details) $ / shares in Units, $ in Thousands | 2 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Feb. 14, 2020 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) votes / shares $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) | Jan. 28, 2020 shares | Jan. 01, 2018 | Jan. 01, 2016
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |  |  |
Capital required for common equity Tier 1 capital to risk-weighted assets |  | 4.50% |  |  |  |  |
Dividends from subsidiaries |  | $ 149,819 |  |  |  |  |
Tier 1 Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets |  | 6.00% |  |  |  |  |
Capital Required for Capital Adequacy to Risk Weighted Assets |  | 8.00% |  |  |  |  |
Leverage Capital Required Ratio To Tangible Assets |  | 4.00% |  |  |  |  |
Tier 2 capital |  | $ 32,500 | $ 20,000 |  |  |  |
Stock repurchases during period |  | $ 450,800 | $ 165,300 |  |  |  |
Price of repurchased shares (usd per share) | $ / shares |  | $ 451.33 | $ 432.78 |  |  |  |
Outstanding Shares Repurchased, Percent |  |  | 9.40% | 3.50% |  |  |
Maximum Undivided Profits Elgible For Dividend Payment Without Changing Well Capitalized Status |  | $ 651,700 |  |  |  |  |
Average Required Maintence Of Non Interst Bearing Reserve Balance |  | $ 730,700 |  |  |  |  |
Capital Conservation Buffer, Annual Percentage Increase |  |  |  |  |  |  | 0.625%
Capital Conservation Buffer |  | 2.50% |  |  |  | 1.875% | 0.625%
Fully Phased In 2019 Capital Conservation Buffer |  | 2.50% |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |  |  |
Stock repurchases during period | $ 63,800 |  |  |  |  |  |
Price of repurchased shares (usd per share) | $ / shares | $ 527.27 |  |  |  |  |  |
Common Class A [Member] |  |  |  |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |  |  |
Votes per share of common stock | votes / shares |  | 1 |  |  |  |  |
Stock repurchases (shares) | shares |  | 998,910 | 382,000 |  |  |  |
Stock repurchases during period |  | $ 450,880 | $ 165,338 |  |  |  |
Stock Repurchased and Retired During Period, Shares | shares |  | 998,910 | 382,000 |  |  |  |
Common Class A [Member] | Subsequent Event |  |  |  |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased | shares |  |  |  |  | 500,000 |  |
Stock repurchases (shares) | shares | 120,990 |  |  |  |  |  |
Class B Common Stock |  |  |  |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |  |  |
Votes per share of common stock | votes / shares |  | 16 |  |  |  |  |
Parent |  |  |  |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |  |  |
Dividends from subsidiaries |  |  | $ 242,910 | $ 50,400 |  |  |
BancShares [Member] |  |  |  |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |  |  |
Tier 1 Capital for Capital Adequacy |  | $ 3,344,305 | 3,463,307 |  |  |  |
Capital Required for Capital Adequacy |  | 3,731,501 | 3,826,626 |  |  |  |
Leverage Capital Required for Capital Adequacy |  | $ 3,344,305 | $ 3,463,307 |  |  |  |
Tier 1 Risk Based Capital to Risk Weighted Assets |  | 10.86% | 12.67% |  |  |  |
Capital to Risk Weighted Assets |  | 12.12% | 13.99% |  |  |  |
Leverage Capital to Average Assets |  | 8.81% | 9.77% |  |  |  |
Tier 1 Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets |  | 8.00% |  |  |  |  |
Common equity Tier 1 |  | $ 3,344,305 | $ 3,463,307 |  |  |  |
Common equity Tier 1 to risk-weighted assets |  | 10.86% | 12.67% |  |  |  |
Common equity Tier 1 required to be well capitalized to risk-weighted assets |  | 6.50% |  |  |  |  |
Capital Required to be Well Capitalized |  | 10.00% |  |  |  |  |
Leverage Capital Required to be Well Capitalized to Average Assets |  | 5.00% |  |  |  |  |
Capital Conservation Buffer |  |  | 4.12% |  |  |  |
FCB [Member] |  |  |  |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |  |  |
Tier 1 Capital for Capital Adequacy |  | $ 3,554,974 | $ 3,315,742 |  |  |  |
Capital Required for Capital Adequacy |  | 3,837,670 | 3,574,561 |  |  |  |
Leverage Capital Required for Capital Adequacy |  | $ 3,554,974 | $ 3,315,742 |  |  |  |
Tier 1 Risk Based Capital to Risk Weighted Assets |  | 11.54% | 12.17% |  |  |  |
Capital to Risk Weighted Assets |  | 12.46% | 13.12% |  |  |  |
Leverage Capital to Average Assets |  | 9.38% | 9.39% |  |  |  |
Tier 1 Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets |  | 8.00% |  |  |  |  |
Common equity Tier 1 |  | $ 3,554,974 | $ 3,315,742 |  |  |  |
Common equity Tier 1 to risk-weighted assets |  | 11.54% | 12.17% |  |  |  |
Common equity Tier 1 required to be well capitalized to risk-weighted assets |  | 6.50% |  |  |  |  |
Capital Required to be Well Capitalized |  | 10.00% |  |  |  |  |
Leverage Capital Required to be Well Capitalized to Average Assets |  | 5.00% |  |  |  |  |
Capital Conservation Buffer |  |  | 4.46% |  |  |  |

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