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Pay vs Performance Disclosure
 12 Months Ended
Dec. 31, 2022
USD ($)
$ / shares
Dec. 31, 2021
USD ($)
$ / shares
Dec. 31, 2020
USD ($)
$ / shares
Pay vs Performance Disclosure [Table]      
Pay vs Performance [Table Text Block]
PAY VERSUS PERFORMANCE TABLE
Value of Initial Fixed $100
Investment Based on:
Year
Summary
Compensation
Table Total
for PEO(1)
Compensation
Actually Paid
to PEO(2)
Average
Summary
Compensation
Table Total
for Non-PEO
NEOs(1)
Average
Compensation
Actually Paid
to Non-PEO
NEOs(2)
Total
Shareholder
Return(3)
Peer Group Total
Shareholder
Return(4)
Net
Income
(in millions)(5)
Earnings Per
Share(6)
2022$2,768,416$1,744,451$938,039$646,504$130$105$89.8$5.07
2021$2,836,970$6,130,154$953,892$1,914,113$157$95$83.5$4.75
2020$2,588,107$4,274,658$994,090$1,515,588$115$83$71.5$4.28
ADJUSTMENTS TO TOTAL COMPENSATION TO DETERMINE CAP TO PEO
YearReported Summary Compensation
Table Total
Subtract: Value in
Stock Awards
Column of the Summary
Compensation Table(a)
Add: Reconciled Value of
Equity Awards to PEO(b)
CAP to PEO(c)
2022$2,768,416$1,209,353$185,388$1,744,451
2021$2,836,970$1,122,109$4,415,293$6,130,154
2020$2,588,107$1,053,668$2,740,219$4,274,658
ADJUSTMENTS TO TOTAL COMPENSATION TO DETERMINE CAP TO NON-PEO NEOs
YearAverage Reported
Summary Compensation
Table Total
Subtract: Average Value
in Stock Awards
Column of the Summary
Compensation Table(a)
Subtract: Average Value in
Change in Pension Value and
NQDC Earnings Column of
Summary Compensation Table(b)
Add: Average
Reconciled Value of
Equity Awards to
Non-PEO NEOs(c)
Average CAP to
Non-PEO NEOs(d)
2022$938,039$345,812$— $54,277$646,504
2021$953,892$325,291$— $1,285,512$1,914,113
2020$994,090$298,510$11,046 $831,054$1,515,588
EQUITY RECONCILIATION FOR CAP TO PEO AND NON-PEO NEOs
PEONon-PEO NEOs
YearYear End
Fair Value of
Equity Awards
Granted in
the Year		Year Over
Year Change in
Fair Value of
Outstanding
Unvested Equity
Awards Granted
in Prior Years		Year Over Year
Change in Fair
Value of Equity Awards
Granted in Prior Years
that Vested in the Year		Total
Equity Award
Adjustments		Year End
Fair Value of
Equity Awards
Granted in
the Year		Year Over
Year Change in
Fair Value of
Outstanding
Unvested Equity
Awards Granted
in Prior Years		Year Over Year
Change in Fair
Value of Equity Awards
Granted in Prior Years
that Vested in the Year		Total
Equity Award
Adjustments
2022$908,038$(97,810)$(624,840)$185,388$259,652$(28,354)$(177,021)$54,277
2021$1,868,236$1,685,102$861,955$4,415,293$541,588$477,399$266,525$1,285,512
2020$1,524,020$579,606$636,593$2,740,219$431,763$179,219$220,072$831,054
    
PEO Total Compensation Amount $ 2,768,416 $ 2,836,970 $ 2,588,107
PEO Actually Paid Compensation Amount 1,744,451 6,130,154 4,274,658
Non-PEO NEO Average Total Compensation Amount 938,039 953,892 994,090
Non-PEO NEO Average Compensation Actually Paid Amount $ 646,504 1,914,113 1,515,588
Compensation Actually Paid vs. Total Shareholder Return [Text Block]
The following graphs demonstrate the relationship between CAP and TSR, CAP and Net Income, and CAP and EPS, in each case, to our CEO and to the average of the Non-PEO NEOs.
Relationship Between CAP vs. TSR
cpk-20230317_g37.jpg
    
Compensation Actually Paid vs. Net Income [Text Block] cpk-20230317_g38.jpg    
Tabular List [Table Text Block]
Tabular List of the Most Important Financial Performance Measures Used to Link CAP to NEOs for the Most Recently Completed Fiscal Year to Company Performance
•
Earnings Per Share
•
Growth in Long-Term Earnings (calculated as total expenditures as a percent of total capitalization)
•
Average Return on Equity (ROE)
    
Total Shareholder Return Amount $ 130 157 115
Peer Group Total Shareholder Return Amount 105 95 83
Net Income (Loss) $ 89,800,000 $ 83,500,000 $ 71,500,000
PEO Name Mr. Householder    
Additional 402(v) Disclosure [Text Block] Total compensation for Mr. Householder and, on average, the four other NEOs as reported in the Summary Compensation Table for 2022, 2021, and 2020, as applicable. Mr. Householder has served as President and Chief Executive Officer of the Company since 2019. The four other NEOs are as follows: Ms. Cooper and Messrs. Moriarty, Sylvester and Webber.Compensation Actually Paid reflects the total compensation as reported in the Summary Compensation Table for the NEOs adjusted in accordance with Item 402(v) of Regulation S-K. In accordance with the requirements of Item 402(v) of Regulation S-K, the following adjustments were made to Mr. Householder's total compensation for 2022, 2021, and 2020, as applicable, to determine Compensation Actually Paid: Represents the grant date fair value of equity awards reported in the “Stock Awards” column in the Summary Compensation Table for the applicable year. The amounts deducted or added (as applicable) in calculating the equity award adjustments for each applicable year are provided in the Equity Reconciliation for CAP to NEOs Table below. There is no compensation that needs to be included for equity awards granted and vested in the same year, equity awards that failed to meet vesting conditions in the year ended, or dividends or other earnings paid on equity awards not otherwise reflected in total compensation for Mr. Householder. No values are shown for pension benefit adjustments because (i) there are no service costs for services rendered during the applicable years because the Pension Plan was frozen prior to the applicable years and formally terminated in 2021, and (ii) there are no prior service costs because no additional benefits were granted in a plan amendment during the applicable years. Mr. Householder did not participate in the Pension Plan. None of the NEOs participate in the Company’s non-qualified Pension SERP Plan.Represents the grant date fair value of equity awards, on average, reported in the “Stock Awards” column for Ms. Cooper and Messrs. Moriarty, Sylvester and Webber in the Summary Compensation Table for the applicable year. None of the NEOs participated in the Pension Plan except for Ms. Cooper, who received a lump sum payout at termination of the Pension Plan in 2021 which was actuarially equivalent to Ms. Cooper's full vested accrued benefit in the Pension Plan. Ms. Cooper’s change in accumulated benefits under the Pension Plan for 2020 is reported in the applicable row of the Summary Compensation Table and is included in the average adjustments to total compensation for calculating CAP to the non-PEO NEOs. None of the NEOs participate in the Company’s non-qualified Pension SERP Plan. The amounts deducted or added (as applicable) in calculating the equity award adjustments for each applicable year are provided in the Equity Reconciliation for CAP to Non-PEO NEOs Table below. There is no compensation that needs to be included for equity awards granted and vested in the same year, equity awards that failed to meet vesting conditions in the year ended, or dividends or other earnings paid on equity awards not otherwise reflected in total compensation for the NEOs. No values are shown for pension benefit adjustments because (i) there are no service costs for services rendered during the applicable years because the Pension Plan was frozen prior to the applicable years and formally terminated in 2021, and (ii) there are no prior service costs because no additional benefits were granted in a plan amendment during the applicable years.    
Measure [Axis]: 1      
Pay vs Performance Disclosure [Table]      
Compensation Actually Paid vs. Other Measure [Text Block]
Relationship Between CAP vs. Earnings Per Share (Basic)
cpk-20230317_g39.jpg
    
Other Performance Measure Amount | $ / shares 5.07 4.75 4.28
PEO [Member] | Measure [Axis]: 1      
Pay vs Performance Disclosure [Table]      
Measure Name Earnings Per Share    
PEO [Member] | Measure [Axis]: 2      
Pay vs Performance Disclosure [Table]      
Measure Name Growth in Long-Term Earnings (calculated as total expenditures as a percent of total capitalization)    
PEO [Member] | Measure [Axis]: 3      
Pay vs Performance Disclosure [Table]      
Measure Name Average Return on Equity (ROE)    
PEO [Member] | Value In Stock Awards [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount $ 1,209,353 $ 1,122,109 $ 1,053,668
PEO [Member] | Reconciled value of equity awards [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 185,388 4,415,293 2,740,219
Non-PEO NEO [Member] | Subtract: Average Value in Stock Awards Column of the Summary Compensation Table [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 345,812 325,291 298,510
Non-PEO NEO [Member] | Subtract: Average Value in Change in Pension Value and NQDC Earnings Column of Summary Compensation Table [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 0 0 11,046
Non-PEO NEO [Member] | Add: Average Reconciled Value of Equity Awards to Non-PEO NEOs [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount $ 54,277 $ 1,285,512 $ 831,054