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Shareholders' Equity (Details) - USD ($) |  |  |  |  |  |  |  |  |  |  | 1 Months Ended | 2 Months Ended | 12 Months Ended |
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Dec. 22, 2017 | Jun. 30, 2017 | Dec. 22, 2016 | Jun. 30, 2016 | May 06, 2016 | Dec. 28, 2015 | Jun. 29, 2015 | Dec. 10, 2014 | Dec. 10, 2013 | Dec. 20, 2012 | May 05, 2016 | Dec. 31, 2013 | Dec. 31, 2012 | Mar. 09, 2018 | Dec. 29, 2017 | Dec. 30, 2016 | Jan. 01, 2016 | Jan. 02, 2015 | Jul. 30, 2002
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares available for future issuance |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,229,558 |  |  |  |
Stock repurchase authorized |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 137,200,000 |  |  |  | $ 5,000,000
Additional stock repurchase authorized |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 132,200,000 |  |  |  |
Amount available under repurchase plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,100,000 |  |  |  |
Repurchase of common stock |  |  |  |  | 1,500,000 |  |  |  |  |  |  |  |  |  | 748,000 | 2,100,000 |  |  |
Purchase price per share |  |  |  |  | $ 14.77 |  |  |  |  |  |  |  |  |  | $ 15.11 | $ 14.60 |  |  |
Total cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 11,298,000 | $ 30,065,000 | $ 1,356,000 |  |
Cumulative purchases |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 134,100,000 |  |  |  |
Weighted average shares outstanding |  |  |  |  | 4.00% |  |  |  |  |  | 11.00% |  |  |  |  |  |  |  |
Weighted average shares outstanding accretive on an annualized basis |  |  |  |  | $ 0.04 |  |  |  |  |  | $ 0.03 |  |  |  |  |  |  |  |
Dividend declared |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.10 |  | $ 0.30 | $ 0.26 | $ 0.20 | $ 0.12 |
Annual cash dividend per share |  |  |  |  |  |  |  |  |  |  |  | $ 0.10 | $ 0.10 |  |  | $ 0.23 |  |  |
Dividend payment | $ 4,700,000 | $ 4,600,000 | $ 4,000,000 | $ 4,000,000 |  | $ 3,200,000 | $ 3,100,000 | $ 3,500,000 | $ 3,100,000 | $ 3,100,000 |  |  |  |  | $ 9,288,000 | $ 7,988,000 | $ 6,266,000 |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount available under repurchase plan |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,200,000 |  |  |  |  |
Dividend declared |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.34 |  |  |  |  |
Executive Team [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  | 53,000 |  |  |  |  |
Purchase price per share |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 18.33 |  |  |  |  |
Total cost |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000 |  |  |  |  |
Chief Executive Officer [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of common stock |  |  |  |  | 697,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beneficial owners |  |  |  |  | 11.80% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Chief Operating Officer [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of common stock |  |  |  |  | 732,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beneficial owners |  |  |  |  | 4.90% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Chief Financial Officer [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of common stock |  |  |  |  | 73,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beneficial owners |  |  |  |  | 0.90% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 26,900,000 | 26,200,000 |  |  |
Purchase price per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4.97 | $ 4.69 |  |  |
Share Repurchase Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 11,300,000 | $ 30,100,000 |  |  |
Share Repurchase Plan [Member] | Director [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  | 53,000 |  |  |  |  |
Purchase price per share |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 18.33 |  |  |  |  |
Total cost |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000 |  |  |  |  |
Share Repurchase Plan [Member] | Executive Team [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  | 53,000 |  |  |  |  |
Purchase price per share |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 18.33 |  |  |  |  |
Total cost |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000 |  |  |  |  |
Tax Withholding [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
shares withheld and not issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 268,000 | 294,000 |  |  |
Cost of shares withheld and not issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,400,000 | $ 4,000,000 |  |  |
Tax Withholding [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
shares withheld and not issued |  |  |  |  |  |  |  |  |  |  |  |  |  | 177,000 |  |  |  |  |
Cost of shares withheld and not issued |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,100,000 |  |  |  |  |
Stock Option [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of eligible compensation allowed, per grant purchase |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% |  |  |  |
Interval between employee stock purchases |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 months |  |  |  |
Employee purchase price as percentage of trading value |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 95.00% |  |  |  |
Aggregate fair market value of shares purchased by an employee |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25,000 |  |  |  |
Employee stock purchase plan, expiration date |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Jul. 01, 2023 |  |  |  |
Total number of shares available for purchase under the plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 211,845 |  |  |  |
Shares issued under ESPP |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 67,761 | 67,111 | 48,356 |  |
Proceeds from ESPP |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000 | $ 1,000,000 | $ 700,000 |  |
Additional shares authorized |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 250,000 |  |  |  |
Shares available for future issuance |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 279,606 |  |  |  |

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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Number of shares of capital stock issued (purchased by employees) in connection with an employee stock ownership plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 25 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=65888597&loc=d3e16649-113920 + Details
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- Definition Aggregate value of stock issued during the period as a result of employee stock ownership plan (ESOP). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 25 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=65888597&loc=d3e16649-113920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 + Details
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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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- Definition Number of shares that have been repurchased during the period and are being held in treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 + Details
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