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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 |  | 3 Months Ended |  |
--- | --- | --- | --- | ---
Apr. 30, 2019 | Mar. 31, 2019 | Jan. 01, 2019 | Oct. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Number of shares authorized to be repurchased (in shares) |  |  |  | 800,000
Stock repurchased during period (in shares) |  | 243,000 |  |
Stock repurchased during period |  | $ 100,700 |  |
Stock repurchased during period (in USD per share) |  | $ 414.58 |  |
Total number of shares repurchase (in shares) |  | 425,000 |  |
Operating lease assets |  | $ 70,815 |  |
Present value of lease liabilities |  | $ 72,315 |  |
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] |  |  |  |
Stock repurchased during period (in shares) | 63,400 |  |  |
Stock repurchased during period | $ 27,400 |  |  |
Stock repurchased during period (in USD per share) | $ 432.78 |  |  |

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