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Stockholders' Equity (Details) - USD ($) |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 121 Months Ended | 164 Months Ended | 180 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 15, 2020 | Nov. 06, 2019 | May 20, 2019 | Aug. 04, 2020 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2020 | Jun. 30, 2020 | Mar. 13, 2020 | Mar. 05, 2019 | May 16, 2018 | May 19, 2015
Schedule of Shareholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  |  |  |  |  |  |  | $ 20,000,000 | $ 20,000,000 | $ 15,000,000 |
Stock repurchased during period (in shares) |  |  |  |  |  |  | 334,440 | 256,572 |  |  | 13,885,674 |  |  |  |
Aggregate price of shares repurchased since inception |  |  |  |  |  |  | $ 17,046,000 | $ 11,171,000 |  |  |  |  |  |  |
Average price of shares repurchased since inception (per share) |  |  |  |  |  |  | $ 50.97 | $ 43.54 |  |  | $ 16.30 |  |  |  |
Cash dividends declared per common share (in dollars per share) |  |  |  |  | $ 0.19 | $ 0.16 | $ 0.19 | $ 0.16 |  |  |  |  |  |  |
Dividend Declared |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Shareholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared per common share (in dollars per share) | $ 0.19 | $ 0.16 | $ 0.16 |  |  |  |  |  |  |  |  |  |  |  |
Open market |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Shareholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program amount authorized (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,700,000
Stock repurchased during period (in shares) |  |  |  |  |  |  | 103,689 | 5,799 | 4,205,255 |  |  |  |  |  |
Aggregate price of shares repurchased since inception |  |  |  |  |  |  | $ 4,987,000 | $ 200,000 | $ 74,793,000 |  |  |  |  |  |
Average price of shares repurchased since inception (per share) |  |  |  |  |  |  | $ 48.10 | $ 34.46 | $ 17.79 |  |  |  |  |  |
401(k) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Shareholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased during period (in shares) |  |  |  |  |  |  | 208,604 | 226,708 |  |  | 7,676,343 |  |  |  |
Aggregate price of shares repurchased since inception |  |  |  |  |  |  | $ 10,957,000 | $ 9,991,000 |  |  | $ 130,883,000 |  |  |  |
Average price of shares repurchased since inception (per share) |  |  |  |  |  |  | $ 52.53 | $ 44.07 |  |  | $ 17.05 |  |  |  |
401(k) | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Shareholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased during period (in shares) |  |  |  | 45,615 |  |  |  |  |  |  |  |  |  |  |
Aggregate price of shares repurchased since inception |  |  |  | $ 2,600,000 |  |  |  |  |  |  |  |  |  |  |
Directors and employees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Shareholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased during period (in shares) |  |  |  |  |  |  | 22,147 | 24,065 |  | 2,004,076 |  |  |  |  |
Aggregate price of shares repurchased since inception |  |  |  |  |  |  | $ 1,102,000 | $ 980,000 |  | $ 20,684,000 |  |  |  |  |
Average price of shares repurchased since inception (per share) |  |  |  |  |  |  | $ 49.76 | $ 40.73 |  | $ 10.32 |  |  |  |  |

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