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Industry Segment Information (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Fee revenue and other income: |  |  |  |  |  |  |  |  |  |  |
Income from customers |  |  |  |  |  |  |  |  | $ 79,907 cass_FeeRevenueAndOtherIncomeRevenueFromCustomers | $ 76,572 cass_FeeRevenueAndOtherIncomeRevenueFromCustomers | $ 71,138 cass_FeeRevenueAndOtherIncomeRevenueFromCustomers
Intersegment income (expense) |  |  |  |  |  |  |  |  |  |  |
Net interest income (expense) after provision for loan losses: |  |  |  |  |  |  |  |  |  |  |
Income from customers |  |  |  |  |  |  |  |  | 37,299 cass_IncomeFromCustomersAfterProvisionForLoanLoss | 38,245 cass_IncomeFromCustomersAfterProvisionForLoanLoss | 40,385 cass_IncomeFromCustomersAfterProvisionForLoanLoss
Intersegment income (expense) |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 3,096 us-gaap_DepreciationAndAmortization | 2,896 us-gaap_DepreciationAndAmortization | 2,532 us-gaap_DepreciationAndAmortization
Income tax expense | 1,902 us-gaap_IncomeTaxExpenseBenefit | 2,013 us-gaap_IncomeTaxExpenseBenefit | 1,958 us-gaap_IncomeTaxExpenseBenefit | 1,886 us-gaap_IncomeTaxExpenseBenefit | 1,582 us-gaap_IncomeTaxExpenseBenefit | 1,533 us-gaap_IncomeTaxExpenseBenefit | 2,106 us-gaap_IncomeTaxExpenseBenefit | 2,013 us-gaap_IncomeTaxExpenseBenefit | 7,759 us-gaap_IncomeTaxExpenseBenefit | 7,234 us-gaap_IncomeTaxExpenseBenefit | 7,887 us-gaap_IncomeTaxExpenseBenefit
Net income | 5,786 us-gaap_NetIncomeLoss | 6,401 us-gaap_NetIncomeLoss | 6,035 us-gaap_NetIncomeLoss | 5,811 us-gaap_NetIncomeLoss | 5,254 us-gaap_NetIncomeLoss | 6,138 us-gaap_NetIncomeLoss | 6,073 us-gaap_NetIncomeLoss | 6,032 us-gaap_NetIncomeLoss | 24,033 us-gaap_NetIncomeLoss | 23,497 us-gaap_NetIncomeLoss | 23,303 us-gaap_NetIncomeLoss
Goodwill | 11,590 us-gaap_Goodwill |  |  |  | 11,590 us-gaap_Goodwill |  |  |  | 11,590 us-gaap_Goodwill | 11,590 us-gaap_Goodwill | 11,590 us-gaap_Goodwill
Other intangible assets, net | 2,762 us-gaap_OtherIntangibleAssetsNet |  |  |  | 3,222 us-gaap_OtherIntangibleAssetsNet |  |  |  | 2,762 us-gaap_OtherIntangibleAssetsNet | 3,222 us-gaap_OtherIntangibleAssetsNet | 3,757 us-gaap_OtherIntangibleAssetsNet
Total assets | 1,500,731 us-gaap_Assets |  |  |  | 1,326,020 us-gaap_Assets |  |  |  | 1,500,731 us-gaap_Assets | 1,326,020 us-gaap_Assets | 1,287,387 us-gaap_Assets
Information Services [Member] |  |  |  |  |  |  |  |  |  |  |
Fee revenue and other income: |  |  |  |  |  |  |  |  |  |  |
Income from customers |  |  |  |  |  |  |  |  | 78,773 cass_FeeRevenueAndOtherIncomeRevenueFromCustomers / us-gaap_StatementBusinessSegmentsAxis = cass_InformationServicesMember | 75,010 cass_FeeRevenueAndOtherIncomeRevenueFromCustomers / us-gaap_StatementBusinessSegmentsAxis = cass_InformationServicesMember | 70,376 cass_FeeRevenueAndOtherIncomeRevenueFromCustomers / us-gaap_StatementBusinessSegmentsAxis = cass_InformationServicesMember
Intersegment income (expense) |  |  |  |  |  |  |  |  | 9,210 cass_FeeRevenueAndOtherIncomeIntersegmentIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = cass_InformationServicesMember | 9,637 cass_FeeRevenueAndOtherIncomeIntersegmentIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = cass_InformationServicesMember | 9,478 cass_FeeRevenueAndOtherIncomeIntersegmentIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = cass_InformationServicesMember
Net interest income (expense) after provision for loan losses: |  |  |  |  |  |  |  |  |  |  |
Income from customers |  |  |  |  |  |  |  |  | 15,678 cass_IncomeFromCustomersAfterProvisionForLoanLoss / us-gaap_StatementBusinessSegmentsAxis = cass_InformationServicesMember | 15,986 cass_IncomeFromCustomersAfterProvisionForLoanLoss / us-gaap_StatementBusinessSegmentsAxis = cass_InformationServicesMember | 18,547 cass_IncomeFromCustomersAfterProvisionForLoanLoss / us-gaap_StatementBusinessSegmentsAxis = cass_InformationServicesMember
Intersegment income (expense) |  |  |  |  |  |  |  |  | 12 cass_IntersegmentIncomeExpenseAfterProvisionForLoanLoss / us-gaap_StatementBusinessSegmentsAxis = cass_InformationServicesMember | 11 cass_IntersegmentIncomeExpenseAfterProvisionForLoanLoss / us-gaap_StatementBusinessSegmentsAxis = cass_InformationServicesMember | 24 cass_IntersegmentIncomeExpenseAfterProvisionForLoanLoss / us-gaap_StatementBusinessSegmentsAxis = cass_InformationServicesMember
Depreciation and amortization |  |  |  |  |  |  |  |  | 2,795 us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = cass_InformationServicesMember | 2,638 us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = cass_InformationServicesMember | 2,392 us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = cass_InformationServicesMember
Income tax expense |  |  |  |  |  |  |  |  | 3,006 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = cass_InformationServicesMember | 2,232 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = cass_InformationServicesMember | 2,802 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = cass_InformationServicesMember
Net income |  |  |  |  |  |  |  |  | 16,379 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = cass_InformationServicesMember | 15,237 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = cass_InformationServicesMember | 15,761 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = cass_InformationServicesMember
Goodwill | 11,454 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cass_InformationServicesMember |  |  |  | 11,454 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cass_InformationServicesMember |  |  |  | 11,454 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cass_InformationServicesMember | 11,454 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cass_InformationServicesMember | 11,454 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cass_InformationServicesMember
Other intangible assets, net | 2,762 us-gaap_OtherIntangibleAssetsNet / us-gaap_StatementBusinessSegmentsAxis = cass_InformationServicesMember |  |  |  | 3,222 us-gaap_OtherIntangibleAssetsNet / us-gaap_StatementBusinessSegmentsAxis = cass_InformationServicesMember |  |  |  | 2,762 us-gaap_OtherIntangibleAssetsNet / us-gaap_StatementBusinessSegmentsAxis = cass_InformationServicesMember | 3,222 us-gaap_OtherIntangibleAssetsNet / us-gaap_StatementBusinessSegmentsAxis = cass_InformationServicesMember | 3,757 us-gaap_OtherIntangibleAssetsNet / us-gaap_StatementBusinessSegmentsAxis = cass_InformationServicesMember
Total assets | 782,844 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = cass_InformationServicesMember |  |  |  | 657,604 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = cass_InformationServicesMember |  |  |  | 782,844 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = cass_InformationServicesMember | 657,604 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = cass_InformationServicesMember | 642,623 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = cass_InformationServicesMember
Banking Services [Member] |  |  |  |  |  |  |  |  |  |  |
Fee revenue and other income: |  |  |  |  |  |  |  |  |  |  |
Income from customers |  |  |  |  |  |  |  |  | 1,134 cass_FeeRevenueAndOtherIncomeRevenueFromCustomers / us-gaap_StatementBusinessSegmentsAxis = cass_BankingServicesMember | 1,216 cass_FeeRevenueAndOtherIncomeRevenueFromCustomers / us-gaap_StatementBusinessSegmentsAxis = cass_BankingServicesMember | 1,272 cass_FeeRevenueAndOtherIncomeRevenueFromCustomers / us-gaap_StatementBusinessSegmentsAxis = cass_BankingServicesMember
Intersegment income (expense) |  |  |  |  |  |  |  |  | 1,504 cass_FeeRevenueAndOtherIncomeIntersegmentIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = cass_BankingServicesMember | 1,479 cass_FeeRevenueAndOtherIncomeIntersegmentIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = cass_BankingServicesMember | 1,663 cass_FeeRevenueAndOtherIncomeIntersegmentIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = cass_BankingServicesMember
Net interest income (expense) after provision for loan losses: |  |  |  |  |  |  |  |  |  |  |
Income from customers |  |  |  |  |  |  |  |  | 21,621 cass_IncomeFromCustomersAfterProvisionForLoanLoss / us-gaap_StatementBusinessSegmentsAxis = cass_BankingServicesMember | 22,259 cass_IncomeFromCustomersAfterProvisionForLoanLoss / us-gaap_StatementBusinessSegmentsAxis = cass_BankingServicesMember | 21,838 cass_IncomeFromCustomersAfterProvisionForLoanLoss / us-gaap_StatementBusinessSegmentsAxis = cass_BankingServicesMember
Intersegment income (expense) |  |  |  |  |  |  |  |  | (12)cass_IntersegmentIncomeExpenseAfterProvisionForLoanLoss / us-gaap_StatementBusinessSegmentsAxis = cass_BankingServicesMember | (11)cass_IntersegmentIncomeExpenseAfterProvisionForLoanLoss / us-gaap_StatementBusinessSegmentsAxis = cass_BankingServicesMember | (24)cass_IntersegmentIncomeExpenseAfterProvisionForLoanLoss / us-gaap_StatementBusinessSegmentsAxis = cass_BankingServicesMember
Depreciation and amortization |  |  |  |  |  |  |  |  | 182 us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = cass_BankingServicesMember | 143 us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = cass_BankingServicesMember | 101 us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = cass_BankingServicesMember
Income tax expense |  |  |  |  |  |  |  |  | 4,753 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = cass_BankingServicesMember | 5,002 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = cass_BankingServicesMember | 5,085 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = cass_BankingServicesMember
Net income |  |  |  |  |  |  |  |  | 7,654 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = cass_BankingServicesMember | 8,133 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = cass_BankingServicesMember | 8,014 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = cass_BankingServicesMember
Goodwill | 136 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cass_BankingServicesMember |  |  |  | 136 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cass_BankingServicesMember |  |  |  | 136 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cass_BankingServicesMember | 136 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cass_BankingServicesMember | 136 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cass_BankingServicesMember
Other intangible assets, net |  |  |  |  |  |  |  |  |  |  |
Total assets | 755,400 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = cass_BankingServicesMember |  |  |  | 679,357 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = cass_BankingServicesMember |  |  |  | 755,400 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = cass_BankingServicesMember | 679,357 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = cass_BankingServicesMember | 668,648 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = cass_BankingServicesMember
Corporate Eliminations and Other [Member] |  |  |  |  |  |  |  |  |  |  |
Fee revenue and other income: |  |  |  |  |  |  |  |  |  |  |
Income from customers |  |  |  |  |  |  |  |  |  | 346 cass_FeeRevenueAndOtherIncomeRevenueFromCustomers / us-gaap_StatementBusinessSegmentsAxis = cass_CorporateEliminationsAndOtherMember | (510)cass_FeeRevenueAndOtherIncomeRevenueFromCustomers / us-gaap_StatementBusinessSegmentsAxis = cass_CorporateEliminationsAndOtherMember
Intersegment income (expense) |  |  |  |  |  |  |  |  | (10,714)cass_FeeRevenueAndOtherIncomeIntersegmentIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = cass_CorporateEliminationsAndOtherMember | (11,116)cass_FeeRevenueAndOtherIncomeIntersegmentIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = cass_CorporateEliminationsAndOtherMember | (11,141)cass_FeeRevenueAndOtherIncomeIntersegmentIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = cass_CorporateEliminationsAndOtherMember
Net interest income (expense) after provision for loan losses: |  |  |  |  |  |  |  |  |  |  |
Income from customers |  |  |  |  |  |  |  |  |  |  |
Intersegment income (expense) |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 119 us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = cass_CorporateEliminationsAndOtherMember | 115 us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = cass_CorporateEliminationsAndOtherMember | 39 us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = cass_CorporateEliminationsAndOtherMember
Income tax expense |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  | 127 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = cass_CorporateEliminationsAndOtherMember | (472)us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = cass_CorporateEliminationsAndOtherMember
Goodwill |  |  |  |  |  |  |  |  |  |  |
Other intangible assets, net |  |  |  |  |  |  |  |  |  |  |
Total assets | $ (37,513)us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = cass_CorporateEliminationsAndOtherMember |  |  |  | $ (10,941)us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = cass_CorporateEliminationsAndOtherMember |  |  |  | $ (37,513)us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = cass_CorporateEliminationsAndOtherMember | $ (10,941)us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = cass_CorporateEliminationsAndOtherMember | $ (23,884)us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = cass_CorporateEliminationsAndOtherMember

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