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Employee Benefits, Stock-Based Compensation (Details) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2016 $ / shares shares | Dec. 31, 2015 USD ($) Plan $ / shares shares | Dec. 31, 2014 USD ($) $ / shares shares | Dec. 31, 2013 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of active incentive stock option plan | Plan |  |  | 1 |  |
Number of inactive incentive stock option plan | Plan |  |  | 2 |  |
Number of shares to be issued upon exercise of outstanding stock-based awards and remaining shares available for future issuance [Abstract] |  |  |  |  |
Shares available for future issuance (in shares) |  |  | 568,000 |  |
Shares available for future issuance [Abstract] |  |  |  |  |
Shares available, beginning of period (in shares) |  |  | 1,563,702 |  |
Shares available for future issuance (in shares) |  |  |  | 1,563,702 |
Black-Scholes option pricing model, weighted average assumptions [Abstract] |  |  |  |  |
Stock-based compensation expense | $ |  |  | $ 800,000 | $ 900,000 | $ 700,000
Dividends paid on restricted stock shares | $ |  |  | 80,000 | 121,000 | 124,000
Unrecognized compensation cost, grant date fair value of vested shares, cash received from option exercises, and actual tax benefit realized [Abstract] |  |  |  |  |
Unrecognized compensation cost of unvested share-based compensation arrangements granted under the plan at year-end | $ |  |  | 495,000 | 861,000 | 1,366,000
Grant date fair value of shares vested for the year | $ |  |  | 1,111,000 | 343,000 | 521,000
Cash received from option exercises under all share-based payment arrangements for the year | $ |  |  | 1,212,000 | 1,163,000 | 5,306,000
Tax benefit realized for the tax deductions from option exercises of the share-based payment arrangements for the year | $ |  |  | $ 82,000 | $ 93,000 | $ 303,000
Expected period for recognition of unrecognized compensation cost |  |  | 2 years 6 months |  |
Stock Options [Member] |  |  |  |  |
Number of shares to be issued upon exercise of outstanding stock-based awards and remaining shares available for future issuance [Abstract] |  |  |  |  |
Number of shares to be issued upon exercise (in shares) |  |  | 122,000 |  |
Weighted average price (in dollars per share) | $ / shares |  |  | $ 32.29 |  |
Shares available for future issuance (in shares) | [1] |  | 568,000 |  |
Black-Scholes option pricing model, weighted average assumptions [Abstract] |  |  |  |  |
Expected option life |  |  | 7 years | 7 years | 7 years 6 months
Expected volatility |  |  | 30.77% | 30.77% | 39.11%
Expected dividend yield |  |  | 3.72% | 3.40% | 3.74%
Risk-free interest rate |  |  | 1.54% | 2.01% | 1.33%
Restricted Stock [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares authorized (in shares) |  |  | 550,000 |  |
Number of shares to be issued upon exercise of outstanding stock-based awards and remaining shares available for future issuance [Abstract] |  |  |  |  |
Number of shares to be issued upon exercise (in shares) | [2] |  |  |  |
Weighted average price (in dollars per share) | $ / shares | [3] |  |  |  |
Shares available for future issuance (in shares) | [1] |  |  |  |
Maximum number of shares to be grant to a participant (in shares) |  |  | 75,000 |  |
Restricted stock activity, grants [Roll Forward] |  |  |  |  |
Outstanding, beginning of period (in shares) |  | 64,735 | 101,309 | 107,511 | 106,561
Granted (in shares) |  |  | 10,582 | 4,561 | 11,904
Vested (in shares) |  |  | (46,482) | (8,949) | (10,954)
Forfeited (in shares) |  |  | (674) | (1,814) | 0
Outstanding, end of period (in shares) |  |  | 64,735 | 101,309 | 107,511
Restricted stock activity, weighted average fair value at grant [Roll Forward] |  |  |  |  |
Outstanding, beginning of period (in dollars per share) | $ / shares |  | $ 28.92 | $ 26.19 | $ 25.91 | $ 25.38
Granted (in dollars per share) | $ / shares |  |  | 32.27 | 37.85 | 30.64
Vested (in dollars per share) | $ / shares |  |  | 23.66 | 28.35 | 25.87
Forfeited (in dollars per share) | $ / shares |  |  | 33.31 | 28.38 | 0
Outstanding, end of period (in dollars per share) | $ / shares |  |  | $ 28.92 | $ 26.19 | $ 25.91
Performance Shares [Member] |  |  |  |  |
Number of shares to be issued upon exercise of outstanding stock-based awards and remaining shares available for future issuance [Abstract] |  |  |  |  |
Number of shares to be issued upon exercise (in shares) | [4] |  |  |  |
Weighted average price (in dollars per share) | $ / shares | [3] |  |  |  |
Shares available for future issuance (in shares) | [1] |  |  |  |
Maximum amount of shares to be grant to a participant | $ |  |  | $ 1,000,000 |  |
Stock Appreciation Rights (SARs) [Member] |  |  |  |  |
Number of shares to be issued upon exercise of outstanding stock-based awards and remaining shares available for future issuance [Abstract] |  |  |  |  |
Number of shares to be issued upon exercise (in shares) | [5] |  |  |  |
Weighted average price (in dollars per share) | $ / shares | [3] |  |  |  |
Shares available for future issuance (in shares) | [1] |  |  |  |
Maximum number of shares to be grant to a participant (in shares) |  |  | 100,000 |  |
1998 Plan [Member] |  |  |  |  |
Shares available for future issuance [Abstract] |  |  |  |  |
Forfeitures (in shares) |  |  | 0 |  |
1998 Plan [Member] | Stock Options [Member] |  |  |  |  |
Options, number of shares [Roll Forward] |  |  |  |  |
Outstanding, beginning of period (in shares) |  | 2,980 | 43,960 | 78,066 | 195,279
Granted (in shares) |  |  | 0 | 0 | 0
Exercised (in shares) |  |  | (40,980) | (34,106) | (117,213)
Forfeited/expired (in shares) |  |  | 0 | 0 | 0
Outstanding, end of period (in shares) |  |  | 2,980 | 43,960 | 78,066
Exercisable, end of period (in shares) |  |  | 2,980 | 43,960 | 78,066
Options, weighted average exercise price [Abstract] |  |  |  |  |
Outstanding, beginning of period (in dollars per share) | $ / shares |  | $ 29.49 | $ 29.43 | $ 28.91 | $ 28.08
Granted (in dollars per share) | $ / shares |  |  | 0 | 0 | 0
Exercised (in dollars per share) | $ / shares |  |  | 29.42 | 28.25 | 27.54
Forfeited/expired (in dollars per share) | $ / shares |  |  | 0 | 0 | 0
Outstanding, end of period (in dollars per share) | $ / shares |  |  | 29.49 | 29.43 | 28.91
Exercisable, end of period (in dollars per share) | $ / shares |  |  | $ 29.49 | $ 29.43 | $ 28.91
Nonvested options, number of shares [Roll Forward] |  |  |  |  |
Granted (in shares) |  |  | 0 | 0 | 0
Nonvested options, weighted average grant date fair value [Abstract] |  |  |  |  |
Intrinsic value of options exercised | $ |  |  | $ 241,000 | $ 270,000 | $ 1,175,000
Intrinsic value of options exercisable | $ |  |  | 16,000 | 316,000 | 948,000
Intrinsic value of outstanding options | $ |  |  | $ 16,000 | $ 316,000 | $ 948,000
Restricted stock activity, grants [Roll Forward] |  |  |  |  |
Outstanding, beginning of period (in shares) |  | 0 | 0 |  |
Outstanding, end of period (in shares) |  |  | 0 | 0 |
Restricted stock activity, weighted average fair value at grant [Roll Forward] |  |  |  |  |
Weighted average remaining contractual term |  |  | 25 days |  |
2006 Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares authorized (in shares) |  |  | 1,650,000 |  |
Number of shares to be issued upon exercise of outstanding stock-based awards and remaining shares available for future issuance [Abstract] |  |  |  |  |
Shares available for future issuance (in shares) |  |  | 1,533,794 |  |
Shares available for future issuance [Abstract] |  |  |  |  |
Shares available, beginning of period (in shares) |  | 18,069 |  |  |
Forfeitures (in shares) |  |  | 674 |  |
Canceled at plan termination (in shares) |  |  | (1,515,725) |  |
Shares available for future issuance (in shares) |  |  | 18,069 |  |
2006 Plan [Member] | Stock Options [Member] |  |  |  |  |
Shares available for future issuance [Abstract] |  |  |  |  |
Issuances (in shares) |  |  | (20,000) |  |
Options, number of shares [Roll Forward] |  |  |  |  |
Outstanding, beginning of period (in shares) |  | 118,574 | 98,821 | 97,047 | 163,524
Granted (in shares) |  |  | 20,000 | 10,000 | 1,650
Exercised (in shares) |  |  | (247) | (5,757) | (68,127)
Forfeited/expired (in shares) |  |  | 0 | (2,469) | 0
Outstanding, end of period (in shares) |  |  | 118,574 | 98,821 | 97,047
Exercisable, end of period (in shares) |  |  | 87,749 | 86,264 | 92,997
Options, weighted average exercise price [Abstract] |  |  |  |  |
Outstanding, beginning of period (in dollars per share) | $ / shares |  | $ 32.36 | $ 32.35 | $ 32.29 | $ 31.56
Granted (in dollars per share) | $ / shares |  |  | 32.27 | 34.75 | 30.64
Exercised (in dollars per share) | $ / shares |  |  | 24.12 | 34.62 | 30.52
Forfeited/expired (in dollars per share) | $ / shares |  |  | 0 | 34.29 | 0
Outstanding, end of period (in dollars per share) | $ / shares |  |  | 32.36 | 32.35 | 32.29
Exercisable, end of period (in dollars per share) | $ / shares |  |  | $ 32.12 | $ 32.25 | $ 32.56
Nonvested options, number of shares [Roll Forward] |  |  |  |  |
Nonvested, beginning of period (in shares) |  | 30,825 | 12,557 |  |
Granted (in shares) |  |  | 20,000 | 10,000 | 1,650
Vested (in shares) |  |  | (1,732) |  |
Forfeited (in shares) |  |  | 0 |  |
Nonvested, end of period (in shares) |  |  | 30,825 | 12,557 |
Nonvested options, weighted average grant date fair value [Abstract] |  |  |  |  |
Nonvested, beginning of period (in dollars per share) | $ / shares |  | $ 7.02 | $ 7.61 |  |
Granted (in dollars per share) | $ / shares |  |  | 6.60 | $ 7.76 | $ 8.23
Vested (in dollars per share) | $ / shares |  |  | 6.48 |  |
Forfeited (in dollars per share) | $ / shares |  |  | 0 |  |
Nonvested, end of period (in dollars per share) | $ / shares |  |  | $ 7.02 | $ 7.61 |
Weighted average fair value of options granted | $ |  |  | $ 130,000 | $ 80,000 | $ 10,000
Intrinsic value of options exercised | $ |  |  | 3,000 | 11,000 | 477,000
Intrinsic value of options exercisable | $ |  |  | 275,000 | 376,000 | 790,000
Intrinsic value of outstanding options | $ |  |  | $ 334,000 | $ 421,000 | $ 849,000
Restricted stock activity, weighted average fair value at grant [Roll Forward] |  |  |  |  |
Weighted average remaining contractual term |  |  | 3 years 6 months |  |
2006 Plan [Member] | Restricted Stock [Member] |  |  |  |  |
Shares available for future issuance [Abstract] |  |  |  |  |
Issuances (in shares) |  |  | (10,582) |  |
2006 Plan [Member] | Restricted Stock [Member] | Subsequent Event [Member] |  |  |  |  |
Number of shares to be issued upon exercise of outstanding stock-based awards and remaining shares available for future issuance [Abstract] |  |  |  |  |
Shares issued (in shares) |  | 18,069 |  |  |
2015 Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares authorized (in shares) |  |  | 550,000 |  |
Number of shares to be issued upon exercise of outstanding stock-based awards and remaining shares available for future issuance [Abstract] |  |  |  |  |
Shares available for future issuance (in shares) |  |  | 550,000 |  |
[1] | Under the 2015 Plan, 550,000 shares are authorized for issuance, none have been issued. Under the 2006 Plan, 1.65 million shares (plus any shares reserved for issuance under the 1998 Stock Option Plan) were authorized for issuance as nonqualified and incentive stock options, SARS, restricted stock and performance units. As of December 31, 2015, 1.5 million shares were available for issuance pursuant to awards granted prior to the termination of the plan on April 28, 2015. In January of 2016, 18,069 restricted stock shares were issued pursuant to these awards. Additional shares will not be issued pursuant to awards granted from prior plans.
[2] | The maximum number of shares of restricted stock that may be granted is 550,000 shares, and the maximum that may be granted to a participant during any calendar year is 75,000 shares.
[3] | Not applicable
[4] | No performance units payable in stock had been issued as of December 31, 2015. The maximum payment that can be made pursuant to performance units granted to any one participant in any calendar year shall be $1,000,000.
[5] | No SARS have been issued. The maximum number of shares with respect to which SARs may be granted to a participant during any calendar year shall be 100,000 shares.

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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + 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 (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + 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 (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + 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 (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + 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 (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The highest quantity of shares an employee can purchase under the plan per period. + 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=6415400&loc=d3e5070-113901 + Details
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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=6415400&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=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + 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 (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. + 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 (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price of options that were either forfeited or expired. + 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 (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + 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=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + 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 (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of exercisable share options (fully vested and expected to vest) that may be converted as of the balance sheet date. + 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 (e)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of share instruments newly issued under a share-based compensation plan. + 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=6415400&loc=d3e5070-113901 + Details
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