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Accounting Policies and Basis of Presentation Accounting Policies and Basis of Presentation (Recently Adopted Accounting Standards) (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Oct. 31, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Oct. 29, 2019 | Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Stock repurchased during period (in shares) |  | 295,900 | 125,000 | 744,400 | 125,000 |  |
Stock repurchased during period |  | $ 135,400 | $ 58,086 | $ 325,900 | $ 58,086 |  |
Stock repurchased during period (in USD per share) |  | $ 457.50 | $ 464.68 | $ 437.84 | $ 464.68 |  |
Operating lease assets |  | $ 79,857 |  | $ 79,857 |  |  |
Present value of lease liabilities |  | 79,234 |  | 79,234 |  |  |
Accounting Standards Update 2016-02 |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Operating lease assets |  |  |  |  |  |  | $ 70,700
Present value of lease liabilities |  |  |  |  |  |  | 71,800
Right-of-use asset previously classified as capital lease |  |  |  |  |  |  | 9,100
Liability previously classified as capital lease |  |  |  |  |  |  | 8,300
Accounting Standards Update 2016-02 | HomeBancorp Inc. |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Present value of lease liabilities |  |  |  |  |  |  | $ 1,100
Subsequent Event |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Number of shares authorized to be repurchased (in shares) |  |  |  |  |  | 500,000 |
Stock repurchased during period (in shares) | 146,100 |  |  |  |  |  |
Stock repurchased during period | $ 69,100 |  |  |  |  |  |
Stock repurchased during period (in USD per share) | $ 472.94 |  |  |  |  |  |
Cloud Computing Arrangement [Member] |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Deferred costs |  | $ 3,700 |  | $ 3,700 |  |  |
Repurchases From Ella Ann Holding |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Number of shares authorized to be repurchased (in shares) |  | 250,000 |  | 250,000 |  |  |
Stock repurchased during period (in shares) |  | 50,000 |  |  |  |  |
Repurchases From Ella Ann Holding | Subsequent Event |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Stock repurchased during period (in shares) | 50,000 |  |  |  |  |  |

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