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Employee Benefit Plans (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Retirement Benefits [Abstract] |  |  |
Outstanding stock options and warrants | 599,902 | 611,518 |
Possible future share issuance authorized under equity incentive plans | 2,016,659 | 2,188,696 |
Total shares reserved for future issuance | 2,616,561 | 2,800,214 |
Possible future share issuance authorized under equity incentive plan restricted stock | 400,000 |  |
Stock-based compensation expense | $ 7,180 | $ 7,466 | $ 6,692
Total unrecognized stock-based compensation costs | $ 5,200 |  |
Weighted average remaining term of vesting periods (in years) | 2 years 1 month 6 days |  |
401(k) Savings Plan [Abstract] |  |  |
401(k) employer match percentage | 75.00% |  |
401(k) employer match salary limit percentage | 6.00% |  |
401(k) employer contribution | $ 1,500 | 1,400 | 1,400
Retirement Plan [Abstract] |  |  |
Retirement plan qualification years of service (in years) | 30 years |  |
Retirement plan qualification age | 55 years |  |
Retirement plan qualification minimum years of service (in years) | 10 years |  |
Retirement plan immediate vesting percentage | 100.00% |  |
Deferred Compensation [Abstract] |  |  |
Marketable securities of non-qualified deferred compensation plan fair value disclosure | $ 2,345 | 1,849 |
Non Qualified Deferred Compensation Obligation Fair Value Disclosure [Roll Forward] |  |  |
Beginning deferred compensation liability | 1,849 | 2,388 | 2,451
Mark to market adjustment to deferred compensation (in general and administrative expenses) | 496 | (182) | 492
Distributions from deferred compensation plans | 0 | (357) | (555)
Ending deferred compensation liability | $ 2,345 | $ 1,849 | $ 2,388
Employee Stock Purchase Plan [Abstract] |  |  |
Employee stock purchase plan salary limit percentage | 25.00% |  |
Employee stock purchase plan market percentage | 85.00% |  |
Number of days at end of quarter used to calculate ESPP discount | 5 days |  |
Shares of Common Stock issued under the employee stock purchase plans | 38,618 | 38,951 | 33,278
Discount percentage on newly issues shares | 15.00% |  |
Discount on newly issued shares expensed as additional compensation | $ 300 | $ 300 | $ 200
Minimum [Member] |  |  |
Retirement Benefits [Abstract] |  |  |
Officer cash bonus target | 35.00% |  |
Officer cash bonus performance factor | 0.00% |  |
Non officer management cash bonus target | 6.00% |  |
Maximum [Member] |  |  |
Retirement Benefits [Abstract] |  |  |
Officer cash bonus target | 135.00% |  |
Officer cash bonus performance factor | 200.00% |  |
Non officer management cash bonus target | 30.00% |  |
2016 Plan [Member] |  |  |
Restricted Stock Activity Rollforward [Abstract] |  |  |
Forfeited (in shares) | (9,521) |  |
2015 Plan [Member] |  |  |
Restricted Stock Activity Rollforward [Abstract] |  |  |
Forfeited (in shares) |  | (13,707) |
2014 Plan [Member] |  |  |
Restricted Stock Activity Rollforward [Abstract] |  |  |
Awarded and issued (in shares) |  |  | 34,669
Stock Options [Member] |  |  |
Retirement Benefits [Abstract] |  |  |
Grant date fair value of each stock option granted (in dollars per option) |  |  | $ 6.72
Assumptions Used in Determining Fair Values of Options/Restricted Stock Granted: |  |  |
Risk free interest rate |  |  | 2.00%
Common stock dividend yield |  |  | 3.40%
Expected volatility rate |  |  | 19.50%
Average expected option life (in years) |  |  | 5 years 9 months
Dividends paid for previous year |  |  | 1 year
Stock Option Activity Rollforward [Abstract] |  |  |
Balance of options outstanding (in shares) | 596,518 | 640,822 | 587,115
Options granted (in shares) |  |  | 168,748
Options exercised (in shares) | (9,026) | (44,304) | (115,041)
Options forfeited (in shares) | (2,590) |  |
Balance of options outstanding (in shares) | 584,902 | 596,518 | 640,822
Stock Option Activity, Weighted Average Exercise Price Rollforward [Abstract] |  |  |
Options outstanding, weighted average exercise price (in dollars per share) | $ 45.67 | $ 45.29 | $ 42.26
Options granted, weighted average exercise price (in dollars per share) |  |  | 52.49
Options exercised, weighted average exercise price (in dollars per share) | 39.53 | 40.15 | 40.41
Options forfeited, weighted average exercise price (in dollars per share) | 48.79 |  |
Options outstanding, weighted average exercise price (in dollars per share) | $ 45.75 | $ 45.67 | $ 45.29
Weighted average remaining life of outstanding options (in years) | 5 years 9 months 18 days |  |
Options exercisable (in shares) | 443,783 |  |
Weighted average exercise price (in dollars per share) | $ 44.78 |  |
Weighted average remaining life (in years) | 5 years 7 months 6 days |  |
Intrinsic value | $ 2,100 |  |
Amount of exercisable options with prices higher than the market price of Company Common Stock | 84,374 |  |
Cash received or receivable from options exercised | $ 400 | $ 1,900 | $ 5,200
Total instrinsic value of options exercised | 100 | 400 | 1,300
Total intrinsic value of options outstanding | $ 2,400 | $ 100 | $ 3,900
2014 to 2017 Stock Options [Member] |  |  |
Retirement Benefits [Abstract] |  |  |
Vesting term of stock options issued/Period for absolute total return of restricted stock issued (in years) | 4 years |  |
Option expiration period (in years) | 10 years |  |
2013 Stock Options [Member] |  |  |
Retirement Benefits [Abstract] |  |  |
Vesting term of stock options issued/Period for absolute total return of restricted stock issued (in years) | 4 years |  |
Option expiration period (in years) | 7 years |  |
Time-Based Restricted Stock [Member] |  |  |
Retirement Benefits [Abstract] |  |  |
Vesting term of stock options issued/Period for absolute total return of restricted stock issued (in years) | 4 years |  |
Restricted Stock Activity Rollforward [Abstract] |  |  |
Balance of restricted stock outstanding (in shares) | 191,239 | 172,246 | 188,981
Awarded and issued (in shares) | 103,590 | 94,984 | 61,404
Vested (in shares) | (73,036) | (73,307) | (78,139)
Forfeited (in shares) | (3,642) | (2,684) |
Balance of restricted stock outstanding (in shares) | 218,151 | 191,239 | 172,246
Restricted Stock Activity, Weighted Average Grant Date Fair Value Rollforward [Abstract] |  |  |
Restricted stock outstanding, weighted average grant date fair value (in dollars per share) | $ 45.62 | $ 46.46 | $ 42.06
Awarded and issued, weighted average grant date fair value (in dollars per share) | 45.98 | 43.01 | 52.49
Vested, weighted average grant date fair value (in dollars per share) | 45.79 | 44.19 | 40.55
Forfeited, weighted average grant date fair value (in dollars per share) | 46.07 | 45.89 |
Restricted stock outstanding, weighted average grant date fair value (in dollars per share) | 45.73 | 45.62 | 46.46
Grant date fair value of restricted stock (in dollars per share) | $ 45.98 | $ 43.01 | $ 52.49
Fair value at grant date of restricted stock issued | $ 4,800 | $ 4,100 | $ 3,200
Vesting date fair value of restricted stock | $ 3,300 | $ 3,200 | $ 4,100
Total Return-Based Restricted Stock [Member] |  |  |
Retirement Benefits [Abstract] |  |  |
Vesting term of stock options issued/Period for absolute total return of restricted stock issued (in years) | 3 years |  |
Assumptions Used in Determining Fair Values of Options/Restricted Stock Granted: |  |  |
Risk free interest rate | 2.40% | 2.30% | 1.60%
Common stock dividend yield | 4.40% | 3.90% | 3.50%
Expected volatility rate | 27.30% | 41.10% | 42.80%
Dividends paid for previous year | 1 year |  |
Restricted Stock Activity Rollforward [Abstract] |  |  |
Balance of restricted stock outstanding (in shares) | 180,094 | 160,724 | 183,724
Awarded and issued (in shares) | 87,344 | 77,456 | 84,013
Vested (in shares) | (45,901) | (41,160) | (107,013)
Forfeited (in shares) | (12,689) | (16,926) |
Balance of restricted stock outstanding (in shares) | 208,848 | 180,094 | 160,724
Restricted Stock Activity, Weighted Average Grant Date Fair Value Rollforward [Abstract] |  |  |
Restricted stock outstanding, weighted average grant date fair value (in dollars per share) | $ 43.34 | $ 44.72 | $ 39.82
Awarded and issued, weighted average grant date fair value (in dollars per share) | 39.42 | 40.81 | 44.76
Vested, weighted average grant date fair value (in dollars per share) | 43.68 | 45.61 | 37.88
Forfeited, weighted average grant date fair value (in dollars per share) | 43.58 | 45.24 |
Restricted stock outstanding, weighted average grant date fair value (in dollars per share) | $ 42.22 | 43.34 | 44.72
Company total return, total return-based restricted stock | 100.00% |  |
Vesting percentage, total return-based restricted stock | 75.00% |  |
Grant date fair value of restricted stock (in dollars per share) | $ 39.42 | $ 40.81 | $ 44.76
Fair value at grant date of restricted stock issued | $ 3,400 | $ 3,200 | $ 2,400
Vesting date fair value of restricted stock | $ 2,100 | $ 1,800 | $ 5,600
Period preceding date of grant | 3 months |  |
Total Return-Based Restricted Stock [Member] | Minimum [Member] |  |  |
Restricted Stock Activity, Weighted Average Grant Date Fair Value Rollforward [Abstract] |  |  |
Percentage of return-based restricted stock issued to officers that will vest | 0.00% |  |
Total Return-Based Restricted Stock [Member] | Maximum [Member] |  |  |
Restricted Stock Activity, Weighted Average Grant Date Fair Value Rollforward [Abstract] |  |  |
Percentage of return-based restricted stock issued to officers that will vest | 150.00% |  |
Total Return-Based Restricted Stock Current Year Issuance [Member] |  |  |
Restricted Stock Activity, Weighted Average Grant Date Fair Value Rollforward [Abstract] |  |  |
Awarded and issued, weighted average grant date fair value (in dollars per share) | $ 39.42 | $ 40.81 | $ 49.59
Grant date fair value of restricted stock (in dollars per share) | $ 39.42 | $ 40.81 | $ 49.59

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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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=116856206&loc=d3e5070-113901 + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -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=116856206&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://fasb.org/us-gaap/role/ref/legacyRef -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=116856206&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://fasb.org/us-gaap/role/ref/legacyRef -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=116856206&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://fasb.org/us-gaap/role/ref/legacyRef -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=116856206&loc=d3e5070-113901 + Details
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