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Stock Based Compensation [Line Items]

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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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.

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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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Amount of tax benefit from exercise of option under share-based payment arrangement.

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Amount of cash inflow from exercise of option under share-based payment arrangement.

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Number of additional shares authorized for issuance under share-based payment arrangement.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Share-Based Compensation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
	May 10, 2010	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jun. 18, 2013	Jan. 21, 2003
Stock Based Compensation [Line Items]
Total assets		$ 5,886,614	$ 5,246,829
Total compensation cost		132	215	$ 251
Tax benefit associated with compensation expense		0	45	53
Total compensation cost		1,300	920	626
Cash received from option exercise		255	236	493
Actual tax benefit realized for the tax deductions		59	104	213
Unrecognized compensation cost		$ 3,000
Weighted-average period cost over which cost is expected to be recognized		1 year 5 months 15 days
Performance Based Share Awards \| Minimum
Stock Based Compensation [Line Items]
Total assets		$ 1,000,000
Performance Based Share Awards \| Maximum
Stock Based Compensation [Line Items]
Total assets		5,000,000
Restricted and Performance Shares
Stock Based Compensation [Line Items]
Total compensation cost		0	215
Tax benefit associated with compensation expense		253	148	79
Total compensation cost		$ 1,200	$ 705	$ 376
Option Activity Under the 2003 Plan
Stock Based Compensation [Line Items]
Maximum common shares issued under the plan						759,375
Number of shares available incentive stock options						759,375
Non-option awards granted (in shares)						379,687
Additional common shares available for issuance (in shares)	885,937
Option Activity Under the 2013 Plan
Stock Based Compensation [Line Items]
Maximum common shares issued under the plan					1,556,325
Number of shares available incentive stock options					225,000
Non-option awards granted (in shares)					900,000
Weighted average grant-date fair value of options granted		$ 0.00	$ 4.44	$ 5.54