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Share-Based Compensation - Weighted average assumptions used in valuing options (Details) - USD ($) |  | 1 Months Ended | 12 Months Ended | 90 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 07, 2020 | Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jun. 30, 2009 | Oct. 29, 2020
Employee Stock Purchase Plan |  |  |  |  |  |  |
Additional disclosures |  |  |  |  |  |  |
Compensation expense |  |  | $ 81,000 | $ 75,000 | $ 82,000 |  |
Employee Stock Purchase Plan |  |  |  |  |  |  |
Number of shares of common stock registered in connection with the establishment of an Employee Stock Purchase Plan |  |  | 363,825 |  |  |  | 1,400,000
Requisite age of employees to be eligible to participate in the plan |  |  | 21 years |  |  |  |
Requisite service period to be eligible to participate in the plan |  |  | 6 months |  |  |  |
Discount rate for eligible employees to purchase company stock (as a percent) |  |  | 5.00% |  |  | 15.00% |
Minimum | Employee Stock Purchase Plan |  |  |  |  |  |  |
Employee Stock Purchase Plan |  |  |  |  |  |  |
Shares available for issuance under the plan |  |  | 1,400,000 |  |  |  |
Maximum | Employee Stock Purchase Plan |  |  |  |  |  |  |
Employee Stock Purchase Plan |  |  |  |  |  |  |
Estimated subscription date fair value (as a percent) |  |  | 95.00% |  |  |  |
Stock Options |  |  |  |  |  |  |
Weighted-average assumptions |  |  |  |  |  |  |
Dividend yield (as a percent) |  |  |  |  | 1.46% |  |
Expected life |  |  |  |  | 8 years 6 months |  |
Expected volatility (as a percent) |  |  |  |  | 28.00% |  |
Risk-free interest rate (as a percent) |  |  |  |  | 2.54% |  |
Additional disclosures |  |  |  |  |  |  |
Total unrecognized compensation cost related to non vested stock option grants |  |  | $ 0 |  |  |  |
Total fair value of shares vested during the period |  |  | 1,400,000 | 799,000 | $ 700,000 |  |
Compensation expense |  |  | $ 720,000 | 641,000 | 751,000 |  |
Restricted Stock Activity and RSUs |  |  |  |  |  |  |
Assumed restricted stock shares from CSFL merger (in shares) |  |  | 136,831 |  |  |  |
Weighted-Average Grant-Date Fair Value |  |  |  |  |  |  |
Assumed restricted stock shares from CSFL merger (in dollars per share) |  |  | $ 37.85 |  |  |  |
Stock Options | CSFL |  |  |  |  |  |  |
Additional disclosures |  |  |  |  |  |  |
Vesting of stock options |  | $ 481,000 |  |  |  |  |
Restricted Stock |  |  |  |  |  |  |
Share-Based Compensation |  |  |  |  |  |  |
Options vested (in shares) |  |  | 61,123 |  |  |  |
Additional disclosures |  |  |  |  |  |  |
Weighted-average period over which unrecognized compensation cost is expected to be recognized |  |  | 1 year 7 months 9 days |  |  |  |
Compensation expense |  |  | $ 1,500,000 | $ 1,700,000 | $ 2,500,000 |  |
Options vested (in shares) |  |  | 61,123 |  |  |  |
Vesting period hold |  |  | 2 years |  |  |  |
Restricted Stock Activity and RSUs |  |  |  |  |  |  |
Nonvested at the beginning of the period (in shares) |  |  | 69,450 |  |  |  |
Assumed restricted stock shares from CSFL merger (in shares) |  |  | 9,755 |  |  |  |
Granted (in shares) |  |  | 9,145 | 8,934 | 7,836 |  |
Vested (in shares) |  |  | (77,029) |  |  |  |
Forfeited (in shares) |  |  | (317) |  |  |  |
Nonvested at the end of the period (in shares) |  |  | 11,004 | 69,450 |  |  |
Weighted-Average Grant-Date Fair Value |  |  |  |  |  |  |
Nonvested at the beginning of the period (in dollars per share) |  |  | $ 58.96 |  |  |  |
Assumed restricted stock shares from CSFL merger (in dollars per share) |  |  | 60.27 |  |  |  |
Granted (in dollars per share) |  |  | 55.96 | $ 73.34 | $ 87.37 |  |
Vested (in dollars per share) |  |  | 58.67 |  |  |  |
Forfeited (in dollars per share) |  |  | 65.86 |  |  |  |
Nonvested at the end of the period (in dollars per share) |  |  | $ 59.42 | $ 58.96 |  |  |
Additional disclosures |  |  |  |  |  |  |
Total unrecognized compensation cost related to nonvested restricted stock and RSUs granted |  |  | $ 537,000,000 |  |  |  |
Total fair value of shares vested during the period |  |  | 4,600,000 | $ 3,000,000.0 | $ 2,500,000 |  |
Employee Stock Purchase Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value |  |  | $ 4,600,000 | 3,000,000.0 | 2,500,000 |  |
Restricted Stock | Maximum |  |  |  |  |  |  |
Additional disclosures |  |  |  |  |  |  |
Vesting period |  |  | 12 months |  |  |  |
Restricted Stock | Employees | Minimum |  |  |  |  |  |  |
Additional disclosures |  |  |  |  |  |  |
Vesting period |  |  | 4 years |  |  |  |
Restricted Stock | CSFL |  |  |  |  |  |  |
Additional disclosures |  |  |  |  |  |  |
Vesting of stock options |  | 704,000 |  |  |  |  |
Restricted Stock Activity and RSUs |  |  |  |  |  |  |
Vested (in shares) | (29,303) |  |  |  |  |  |
Restricted Stock Units |  |  |  |  |  |  |
Additional disclosures |  |  |  |  |  |  |
Weighted-average period over which unrecognized compensation cost is expected to be recognized |  |  | 2 years 9 months 18 days |  |  |  |
Compensation expense |  |  | $ 21,000,000.0 | $ 6,400,000 | $ 5,500,000 |  |
Vesting period |  |  | 3 years |  |  |  |
Restricted Stock Activity and RSUs |  |  |  |  |  |  |
Nonvested at the beginning of the period (in shares) |  |  | 324,601 |  |  |  |
Assumed restricted stock shares from CSFL merger (in shares) |  |  | 388,381 |  |  |  |
Granted (in shares) |  |  | 382,205 | 159,521 | 113,270 |  |
Vested (in shares) |  |  | (275,661) |  |  |  |
Forfeited (in shares) |  |  | (68,705) |  |  |  |
Nonvested at the end of the period (in shares) |  |  | 750,821 | 324,601 |  |  |
Weighted-Average Grant-Date Fair Value |  |  |  |  |  |  |
Nonvested at the beginning of the period (in dollars per share) |  |  | $ 76.44 |  |  |  |
Assumed restricted stock shares from CSFL merger (in dollars per share) |  |  | 60.27 |  |  |  |
Granted (in dollars per share) |  |  | 61.27 |  |  |  |
Vested (in dollars per share) |  |  | 75.63 |  |  |  |
Forfeited (in dollars per share) |  |  | 74.09 |  |  |  |
Nonvested at the end of the period (in dollars per share) |  |  | $ 60.88 | $ 76.44 |  |  |
Additional disclosures |  |  |  |  |  |  |
Total unrecognized compensation cost related to nonvested restricted stock and RSUs granted |  |  | $ 27,700,000 |  |  |  |
Total fair value of shares vested during the period |  |  | $ 23,600,000 | $ 5,800,000 | $ 5,700,000 |  |
Target RSU award level (as a percent) |  |  | 1.00% |  |  |  |
Employee Stock Purchase Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value |  |  | $ 23,600,000 | $ 5,800,000 | $ 5,700,000 |  |
Restricted Stock Units | CSFL |  |  |  |  |  |  |
Additional disclosures |  |  |  |  |  |  |
Vesting of stock options |  | $ 7,500,000 |  |  |  |  |
Restricted Stock Activity and RSUs |  |  |  |  |  |  |
Vested (in shares) | (242,018) |  |  |  |  |  |
Performance based restricted stock units |  |  |  |  |  |  |
Additional disclosures |  |  |  |  |  |  |
Performance period |  |  | 3 years |  |  |  |
Other Performance based restricted stock units |  |  |  |  |  |  |
Additional disclosures |  |  |  |  |  |  |
Performance period |  |  | 1 year |  |  |  |
Timed based restricted stock units |  |  |  |  |  |  |
Additional disclosures |  |  |  |  |  |  |
Performance period |  |  | 4 years |  |  |  |

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- Definition Represents the period over which performance is measured, from grant date to maturity date, to determine the amount of the share based award. + References No definition available. + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options. + 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 (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Amount of cost to be recognized for option under share-based payment 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 (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Amount of additional cost recognized for award under share-based payment arrangement from occurrence of event accelerating recognition of cost. + References No definition available. + Details
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- Definition Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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=120381028&loc=d3e5070-113901 + Details
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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=120381028&loc=d3e5070-113901 + Details
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- Definition Discount rate from fair value on offering date that participants pay for 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 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited 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)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + 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)(3) -URI http://asc.fasb.org/extlink&oid=120381028&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=120381028&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=120381028&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=120381028&loc=d3e5070-113901 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + 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=120381028&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=120381028&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=120381028&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=120381028&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=120381028&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=120381028&loc=d3e5070-113901 + Details
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- Definition Number of shares authorized for issuance under share-based payment 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 (a)(3) -URI http://asc.fasb.org/extlink&oid=120381028&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + 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)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.D.2) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 + Details
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- Definition Weighted average remaining contractual term for fully vested and expected to vest exercisable or convertible options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + 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 (e)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock. + 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) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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