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Parent Company Financial Statements (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Assets:      
Cash on deposit $ 56,299us-gaap_CashAndDueFromBanks $ 64,828us-gaap_CashAndDueFromBanks  
Goodwill 65,490us-gaap_Goodwill 65,490us-gaap_Goodwill  
Premises and equipment, net 49,980us-gaap_PropertyPlantAndEquipmentNet 52,000us-gaap_PropertyPlantAndEquipmentNet  
Other assets 27,378us-gaap_OtherAssets 27,228us-gaap_OtherAssets  
Total assets 3,723,765us-gaap_Assets 3,581,716us-gaap_Assets  
Liabilities and shareholders' equity:      
Other liabilities 32,893us-gaap_OtherLiabilities 30,991us-gaap_OtherLiabilities  
Total liabilities 3,275,888us-gaap_Liabilities 3,169,224us-gaap_Liabilities  
Shareholders' equity 447,877us-gaap_StockholdersEquity 412,492us-gaap_StockholdersEquity  
Total liabilities and shareholders' equity 3,723,765us-gaap_LiabilitiesAndStockholdersEquity 3,581,716us-gaap_LiabilitiesAndStockholdersEquity  
Expenses:      
Interest expense 11,797us-gaap_InterestExpense 13,440us-gaap_InterestExpense 21,588us-gaap_InterestExpense
Other expenses 15,260us-gaap_OtherNoninterestExpense 20,638us-gaap_OtherNoninterestExpense 16,053us-gaap_OtherNoninterestExpense
Income before income taxes and equity in undistributed income of subsidiaries 62,397us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 65,172us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 65,087us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax benefit 19,146us-gaap_IncomeTaxExpenseBenefit 20,000us-gaap_IncomeTaxExpenseBenefit 20,225us-gaap_IncomeTaxExpenseBenefit
Net income 43,251us-gaap_NetIncomeLoss 45,172us-gaap_NetIncomeLoss 44,862us-gaap_NetIncomeLoss
Unrealized holding gains (losses) on securities available-for-sale      
Unrealized holding gains (losses) arising during the period 13,928us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax (31,878)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax 4,973us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax
Less: Reclassification adjustments for realized (gains) losses included in net income 211us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax 45us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax (1,155)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax
Other comprehensive income (loss), net of tax 9,190us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent (20,691)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent 2,482us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Comprehensive income 52,441us-gaap_ComprehensiveIncomeNetOfTax 24,481us-gaap_ComprehensiveIncomeNetOfTax 47,344us-gaap_ComprehensiveIncomeNetOfTax
Cash flows from operating activities:      
Net income 43,251us-gaap_NetIncomeLoss 45,172us-gaap_NetIncomeLoss 44,862us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation 4,314us-gaap_DepreciationAmortizationAndAccretionNet 4,562us-gaap_DepreciationAmortizationAndAccretionNet 4,324us-gaap_DepreciationAmortizationAndAccretionNet
Stock-based compensation 852us-gaap_ShareBasedCompensation 698us-gaap_ShareBasedCompensation 592us-gaap_ShareBasedCompensation
Excess tax benefits of stock-based compensation 760us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities 572us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities 496us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
Changes in:      
Other assets (60)us-gaap_IncreaseDecreaseInOtherOperatingAssets 4,647us-gaap_IncreaseDecreaseInOtherOperatingAssets 1,792us-gaap_IncreaseDecreaseInOtherOperatingAssets
Other liabilities (1,339)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities 323us-gaap_IncreaseDecreaseInOtherOperatingLiabilities 7,130us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
Net cash provided by operating activities 57,528us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 90,716us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 57,896us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Cash flows from investing activities:      
Purchase of premises and equipment (2,081)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (2,105)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (4,301)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Net cash used in investing activities (144,076)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (122,046)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (70,963)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Cash flows from financing activities:      
Issuance of common stock 1,992us-gaap_ProceedsFromIssuanceOfCommonStock 6,348us-gaap_ProceedsFromIssuanceOfCommonStock 4,395us-gaap_ProceedsFromIssuanceOfCommonStock
Excess tax benefits of stock-based compensation (760)us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities (572)us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities (496)us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Dividends paid (20,570)us-gaap_PaymentsOfDividends (24,546)us-gaap_PaymentsOfDividends (19,215)us-gaap_PaymentsOfDividends
Net cash provided by (used in) financing activities 85,424us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations (69,589)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations (17,854)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Net decrease in cash and cash equivalents (1,124)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (100,919)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (30,921)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of year 106,641us-gaap_CashAndCashEquivalentsAtCarryingValue 207,560us-gaap_CashAndCashEquivalentsAtCarryingValue 238,481us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of year 105,517us-gaap_CashAndCashEquivalentsAtCarryingValue 106,641us-gaap_CashAndCashEquivalentsAtCarryingValue 207,560us-gaap_CashAndCashEquivalentsAtCarryingValue
Parent Company [Member]      
Assets:      
Cash on deposit 995us-gaap_CashAndDueFromBanks
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
1,272us-gaap_CashAndDueFromBanks
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Investment in and advances to subsidiaries 503,252us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
468,240us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Goodwill 4,973us-gaap_Goodwill
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
4,973us-gaap_Goodwill
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Premises and equipment, net 207us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
235us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Other assets 1,173us-gaap_OtherAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
617us-gaap_OtherAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Total assets 510,600us-gaap_Assets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
475,337us-gaap_Assets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Liabilities and shareholders' equity:      
Long-term debt 61,341us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
61,341us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Other liabilities 1,382us-gaap_OtherLiabilities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
1,504us-gaap_OtherLiabilities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Total liabilities 62,723us-gaap_Liabilities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
62,845us-gaap_Liabilities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Shareholders' equity 447,877us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
412,492us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Total liabilities and shareholders' equity 510,600us-gaap_LiabilitiesAndStockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
475,337us-gaap_LiabilitiesAndStockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Income:      
Dividends from subsidiary banks 19,534us-gaap_InvestmentIncomeDividend
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
13,035us-gaap_InvestmentIncomeDividend
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
16,572us-gaap_InvestmentIncomeDividend
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Other income 196us-gaap_OtherIncome
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
545us-gaap_OtherIncome
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
238us-gaap_OtherIncome
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Total income 19,730us-gaap_Revenues
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
13,580us-gaap_Revenues
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
16,810us-gaap_Revenues
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Expenses:      
Interest expense 1,131us-gaap_InterestExpense
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
1,161us-gaap_InterestExpense
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
2,403us-gaap_InterestExpense
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Depreciation expense 153us-gaap_Depreciation
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
163us-gaap_Depreciation
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
127us-gaap_Depreciation
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Other expenses 2,550us-gaap_OtherNoninterestExpense
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
2,442us-gaap_OtherNoninterestExpense
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
1,990us-gaap_OtherNoninterestExpense
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Total expenses 3,834ctbi_Expenses
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
3,766ctbi_Expenses
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
4,520ctbi_Expenses
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Income before income taxes and equity in undistributed income of subsidiaries 15,896us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
9,814us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
12,290us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Income tax benefit (1,548)us-gaap_IncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(1,416)us-gaap_IncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(1,750)us-gaap_IncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Income before equity in undistributed income of subsidiaries 17,444ctbi_IncomeBeforeEquityInUndistributedIncomeOfSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
11,230ctbi_IncomeBeforeEquityInUndistributedIncomeOfSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
14,040ctbi_IncomeBeforeEquityInUndistributedIncomeOfSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Equity in undistributed income of subsidiaries 25,807ctbi_EquityInUndistributedIncomeOfSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
33,942ctbi_EquityInUndistributedIncomeOfSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
30,822ctbi_EquityInUndistributedIncomeOfSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Net income 43,251us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
45,172us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
44,862us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Unrealized holding gains (losses) on securities available-for-sale      
Unrealized holding gains (losses) arising during the period 13,928us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(31,878)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
4,973us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Less: Reclassification adjustments for realized (gains) losses included in net income 211us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
45us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(1,155)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Tax expense (benefit) 4,949us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(11,142)us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
1,336us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Other comprehensive income (loss), net of tax 9,190us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(20,691)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
2,482us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Comprehensive income 52,441us-gaap_ComprehensiveIncomeNetOfTax
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
24,481us-gaap_ComprehensiveIncomeNetOfTax
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
47,344us-gaap_ComprehensiveIncomeNetOfTax
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Cash flows from operating activities:      
Net income 43,251us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
45,172us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
44,862us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation 153us-gaap_DepreciationAmortizationAndAccretionNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
163us-gaap_DepreciationAmortizationAndAccretionNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
127us-gaap_DepreciationAmortizationAndAccretionNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Equity in undistributed earnings of subsidiaries (25,807)ctbi_EquityInUndistributedIncomeOfSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(33,942)ctbi_EquityInUndistributedIncomeOfSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(30,822)ctbi_EquityInUndistributedIncomeOfSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Stock-based compensation 838us-gaap_ShareBasedCompensation
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
658us-gaap_ShareBasedCompensation
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
512us-gaap_ShareBasedCompensation
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Excess tax benefits of stock-based compensation 760us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
572us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
496us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Changes in:      
Other assets (558)us-gaap_IncreaseDecreaseInOtherOperatingAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
660us-gaap_IncreaseDecreaseInOtherOperatingAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(771)us-gaap_IncreaseDecreaseInOtherOperatingAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Other liabilities 563us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
1,505us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
495us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Net cash provided by operating activities 19,200us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
14,788us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
14,899us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Cash flows from investing activities:      
Purchase of premises and equipment (125)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(148)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(166)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Repayment of investments in and advances to subsidiaries (14)us-gaap_PaymentsToAcquireBusinessesAndInterestInAffiliates
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(40)us-gaap_PaymentsToAcquireBusinessesAndInterestInAffiliates
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(80)us-gaap_PaymentsToAcquireBusinessesAndInterestInAffiliates
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Net cash used in investing activities (139)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(188)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(246)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Cash flows from financing activities:      
Issuance of common stock 1,992us-gaap_ProceedsFromIssuanceOfCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
6,348us-gaap_ProceedsFromIssuanceOfCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
4,395us-gaap_ProceedsFromIssuanceOfCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Excess tax benefits of stock-based compensation (760)us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(572)us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(496)us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Dividends paid (20,570)us-gaap_PaymentsOfDividends
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(24,546)us-gaap_PaymentsOfDividends
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(19,215)us-gaap_PaymentsOfDividends
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Net cash provided by (used in) financing activities (19,338)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(18,770)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(15,316)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Net decrease in cash and cash equivalents (277)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(4,170)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(663)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Cash and cash equivalents at beginning of year 1,272us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
5,442us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
6,105us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Cash and cash equivalents at end of year $ 995us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
$ 1,272us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
$ 5,442us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember