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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Cash Flows From Operating Activities: |  |  |
Net income | $ 24,033 us-gaap_NetIncomeLoss | $ 23,497 us-gaap_NetIncomeLoss | $ 23,303 us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 8,181 us-gaap_DepreciationAmortizationAndAccretionNet | 7,346 us-gaap_DepreciationAmortizationAndAccretionNet | 6,916 us-gaap_DepreciationAmortizationAndAccretionNet
Net gains on sales of securities | (23)us-gaap_GainLossOnSaleOfSecuritiesNet | (4,024)us-gaap_GainLossOnSaleOfSecuritiesNet | (2,635)us-gaap_GainLossOnSaleOfSecuritiesNet
Stock-based compensation expense | 2,041 us-gaap_ShareBasedCompensation | 1,975 us-gaap_ShareBasedCompensation | 1,399 us-gaap_ShareBasedCompensation
Provisions for loan losses |  | 500 us-gaap_ProvisionForLoanLossesExpensed | 2,400 us-gaap_ProvisionForLoanLossesExpensed
Deferred income tax (benefit) expense | (679)us-gaap_DeferredIncomeTaxExpenseBenefit | 57 us-gaap_DeferredIncomeTaxExpenseBenefit | 974 us-gaap_DeferredIncomeTaxExpenseBenefit
Increase (decrease) in income tax liability | 34 us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable | (964)us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable | 1,073 us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable
Increase (decrease) in pension liability | 2,282 us-gaap_IncreaseDecreaseInPensionPlanObligations | 2,822 us-gaap_IncreaseDecreaseInPensionPlanObligations | (2,158)us-gaap_IncreaseDecreaseInPensionPlanObligations
Other operating activities, net | (1,026)us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities | (2,323)us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities | 4,056 us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities
Net cash provided by operating activities | 34,843 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations | 28,886 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations | 35,328 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Cash Flows From Investing Activities: |  |  |
Proceeds from sales of securities available-for-sale | 587 us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities | 95,742 us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities | 69,747 us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
Proceeds from maturities of securities available-for-sale | 18,340 us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities | 18,117 us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities | 11,898 us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities
Purchase of securities available-for-sale | (54,054)us-gaap_PaymentsToAcquireAvailableForSaleSecurities | (104,351)us-gaap_PaymentsToAcquireAvailableForSaleSecurities | (114,646)us-gaap_PaymentsToAcquireAvailableForSaleSecurities
Net (increase) decrease in loans | (16,954)us-gaap_PaymentsForProceedsFromLoansAndLeases | 34,378 us-gaap_PaymentsForProceedsFromLoansAndLeases | (19,165)us-gaap_PaymentsForProceedsFromLoansAndLeases
Increase in payments in excess of funding | (42,577)cass_IncreaseDecreaseInPaymentsInExcessOfFunding | (14,128)cass_IncreaseDecreaseInPaymentsInExcessOfFunding | (2,144)cass_IncreaseDecreaseInPaymentsInExcessOfFunding
Purchases of premises and equipment, net | (6,291)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | (4,857)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | (3,099)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Environmental management acquisition |  |  | (7,798)us-gaap_PaymentsToAcquireBusinessesGross
Net cash (used in) provided by investing activities | (100,949)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations | 24,901 us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations | (65,207)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Cash Flows From Financing Activities: |  |  |
Net increase (decrease) in noninterest-bearing demand deposits | 15,158 cass_IncreaseDecreaseInNonInterestBearingDemandDeposits | (302)cass_IncreaseDecreaseInNonInterestBearingDemandDeposits | 12,187 cass_IncreaseDecreaseInNonInterestBearingDemandDeposits
Net increase in interest-bearing demand and savings deposits | 39,766 us-gaap_IncreaseDecreaseInDemandDeposits | 32,645 us-gaap_IncreaseDecreaseInDemandDeposits | 21,683 us-gaap_IncreaseDecreaseInDemandDeposits
Net decrease in time deposits | (19,221)us-gaap_IncreaseDecreaseInTimeDeposits | (13,555)us-gaap_IncreaseDecreaseInTimeDeposits | (18,530)us-gaap_IncreaseDecreaseInTimeDeposits
Net increase (decrease) in accounts and drafts payable | 111,475 us-gaap_IncreaseDecreaseInAccountsPayableAndOtherOperatingLiabilities | 21,192 us-gaap_IncreaseDecreaseInAccountsPayableAndOtherOperatingLiabilities | (72,440)us-gaap_IncreaseDecreaseInAccountsPayableAndOtherOperatingLiabilities
Cash dividends paid | (9,337)us-gaap_PaymentsOfDividendsCommonStock | (8,510)us-gaap_PaymentsOfDividendsCommonStock | (7,361)us-gaap_PaymentsOfDividendsCommonStock
Purchase of common shares for treasury | (1,848)us-gaap_PaymentsForRepurchaseOfCommonStock |  |
Other financing activities, net | (814)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities | (1,083)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities | (534)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
Net cash (used in) provided by financing activities | 135,179 us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations | 30,387 us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations | (64,995)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Net increase (decrease) in cash and cash equivalents | 69,073 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | 84,174 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | (94,874)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of year | 225,262 us-gaap_CashAndCashEquivalentsAtCarryingValue | 141,088 us-gaap_CashAndCashEquivalentsAtCarryingValue | 235,962 us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of year | 294,335 us-gaap_CashAndCashEquivalentsAtCarryingValue | 225,262 us-gaap_CashAndCashEquivalentsAtCarryingValue | 141,088 us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental information: |  |  |
Cash paid for interest | 2,491 us-gaap_InterestPaidNet | 2,855 us-gaap_InterestPaidNet | 3,196 us-gaap_InterestPaidNet
Cash paid for income taxes | $ 8,476 us-gaap_IncomeTaxesPaidNet | $ 8,265 us-gaap_IncomeTaxesPaidNet | $ 6,407 us-gaap_IncomeTaxesPaidNet

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- Definition The net cash outflow or inflow for the increase (decrease) in the beginning and end of period of loan and lease balances which are not originated or purchased specifically for resale. Includes cash payments and proceeds associated with (a) loans held-for-investment, (b) leases held-for-investment, and (c) both. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition The cash outflow to acquire debt and equity securities not classified as either held-to-maturity securities or trading securities which would be classified as available-for-sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition The cash inflow associated with maturities (principal being due), prepayments and calls (requests of early payments) on securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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- Definition The net cash inflow or outflow from other financing activities. This element is used when there is not a more specific and appropriate element in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3095-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3098-108585 + Details
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- Definition The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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- Definition Amount of expense related to loss from loan transactions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 9 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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