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Share-Based Compensation (Narrative) (Details) $ / shares in Units, $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
May 22, 2019 | Feb. 26, 2019 | Dec. 31, 2019 USD ($) Director $ / shares shares | Dec. 31, 2018 USD ($) Director $ / shares shares | Dec. 31, 2017 USD ($) Director $ / shares shares | Dec. 31, 2016 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Expiration period |  |  | 10 years |  |  |
Stock options awarded |  |  | 0 | 0 | 0 |
Unrecognized compensation expense | $ |  |  | $ 0 |  |  |
Aggregate intrinsic value | $ |  |  |  | $ 236 | $ 297 |
Proceeds from stock options exercised | $ |  |  |  | $ 320 | $ 413 |
Director [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Grant date fair value | $ / shares |  |  | $ 29.78 | $ 29.03 | $ 30.88 |
Shares issued in lieu of cash |  |  | 4,192 | 6,363 | 7,841 |
Number of non-employee directors | Director |  |  | 3 | 5 | 6 |
Restricted Stock Awards [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Unrecognized compensation expense | $ |  |  | $ 2,000 |  |  |
Expected recognition expense period, weighted average period in years |  |  | 2 years |  |  |
TSR Performance Requirement [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Expected term | 2 years 7 months 9 days | 2 years 10 months 2 days |  | 2 years 10 months 2 days | 2 years 10 months 6 days |
Risk free interest rate | 2.18% | 2.43% |  | 2.39% | 1.45% |
Expected dividend yield | 3.60% | 3.20% |  | 2.83% | 2.41% |
Expected stock price volatility | 22.00% | 21.30% |  | 21.20% | 21.90% |
2015 Long-Term Incentive Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of shares available for grant |  |  | 216,000 |  |  |
Non-employee Directors Stock Incentive Plan [Member] | Restricted Stock Awards [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Restricted shares of common stock awarded |  |  | 8,226 | 7,370 | 8,898 |
Required service period |  |  | 1 year | 1 year | 1 year |
Grant date fair value | $ / shares |  |  | $ 27.33 | $ 33.90 | $ 29.47 |
Non-employee Directors Stock Incentive Plan [Member] | Restricted Stock Awards [Member] | Vested Immediately [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share based compensation, vesting percentage |  |  | 50.00% |  |  |
Restricted shares of common stock awarded |  |  | 4,113 | 3,690 | 4,454 |
Non-employee Directors Stock Incentive Plan [Member] | Restricted Stock Awards [Member] | Vested After Completion of One-Year Service Requirement [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share based compensation, vesting percentage |  |  | 50.00% |  |  |
Restricted shares of common stock awarded |  |  | 4,113 | 3,680 | 4,444 |
Management Stock Incentive Plan [Member] | Restricted Stock Awards [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Restricted shares of common stock awarded |  |  |  |  |  | 12,531
Required service period |  |  | 3 years | 3 years | 3 years |
Grant date fair value | $ / shares |  |  | $ 25.60 | $ 27.76 | $ 31.88 |
Share-based vesting date |  |  |  |  | Feb. 22, 2020 |
Management Stock Incentive Plan [Member] | Restricted Stock Awards [Member] | TSR Performance Requirement [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Required service period |  |  | 3 years | 1 year | 3 years |
Management Stock Incentive Plan [Member] | PSUs [Member] | TSR Performance Requirement [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share based compensation, vesting percentage |  |  | 50.00% |  |  |
Management Stock Incentive Plan [Member] | PSUs [Member] | ROAA Performance Requirement [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share based compensation, vesting percentage |  |  | 50.00% |  |  |
Maximum [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting period |  |  | 5 years |  |  |
Maximum [Member] | Restricted Stock Awards [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting period |  |  | 3 years |  |  |
Maximum [Member] | 2015 Long-Term Incentive Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Maximum number of grants authorized |  |  | 438,076 |  |  |
Maximum [Member] | Management Stock Incentive Plan [Member] | Restricted Stock Awards [Member] | TSR Performance Requirement [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Restricted shares of common stock awarded |  |  | 21,970 | 14,877 |  |
Maximum [Member] | Management Stock Incentive Plan [Member] | Restricted Stock Awards [Member] | Vested After Completion of Three-Year Service Requirement [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Restricted shares of common stock awarded |  |  | 54,476 | 37,676 | 27,831 |
Minimum [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting period |  |  | 3 years |  |  |
Minimum [Member] | Restricted Stock Awards [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting period |  |  | 2 years |  |  |

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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The number of grants made 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 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 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 risk-free interest rate assumption that is used in valuing an option on its own shares. + 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)(iv) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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