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FIRST FINANCIAL BANCORP. (PARENT COMPANY ONLY) FINANCIAL INFORMATION (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Statement of Financial Position [Abstract]        
Cash $ 110,122us-gaap_CashAndDueFromBanks $ 117,620us-gaap_CashAndDueFromBanks $ 134,502us-gaap_CashAndDueFromBanks  
Investment securities, available for sale 840,468us-gaap_AvailableForSaleSecurities 913,601us-gaap_AvailableForSaleSecurities    
Other investments 52,626us-gaap_OtherInvestments 47,427us-gaap_OtherInvestments    
Premises and equipment 141,381us-gaap_PropertyPlantAndEquipmentNet 137,110us-gaap_PropertyPlantAndEquipmentNet    
Total assets 7,217,821us-gaap_Assets 6,417,213us-gaap_Assets    
Other liabilities 68,369us-gaap_OtherLiabilities 88,016us-gaap_OtherLiabilities    
Total liabilities 6,433,744us-gaap_Liabilities 5,735,052us-gaap_Liabilities    
Shareholders’ equity 784,077us-gaap_StockholdersEquity 682,161us-gaap_StockholdersEquity 710,425us-gaap_StockholdersEquity 712,221us-gaap_StockholdersEquity
Total liabilities and shareholders’ equity 7,217,821us-gaap_LiabilitiesAndStockholdersEquity 6,417,213us-gaap_LiabilitiesAndStockholdersEquity    
Income Statement [Abstract]        
Noninterest income 63,965us-gaap_NoninterestIncome 73,647us-gaap_NoninterestIncome 122,421us-gaap_NoninterestIncome  
Salaries and employee benefits 107,702us-gaap_LaborAndRelatedExpense 101,402us-gaap_LaborAndRelatedExpense 113,154us-gaap_LaborAndRelatedExpense  
Miscellaneous professional services 6,170us-gaap_ProfessionalFees 6,876us-gaap_ProfessionalFees 7,269us-gaap_ProfessionalFees  
Income before income taxes and equity in undistributed net earnings of subsidiaries 95,028us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 67,583us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 103,745us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments  
Income tax benefit 30,028us-gaap_IncomeTaxExpenseBenefit 19,234us-gaap_IncomeTaxExpenseBenefit 36,442us-gaap_IncomeTaxExpenseBenefit  
Net income 65,000us-gaap_NetIncomeLoss 48,349us-gaap_NetIncomeLoss 67,303us-gaap_NetIncomeLoss  
Operating activities        
Net income 65,000us-gaap_NetIncomeLoss 48,349us-gaap_NetIncomeLoss 67,303us-gaap_NetIncomeLoss  
Adjustments to reconcile net income to net cash provided by operating activities        
Depreciation and amortization 12,785us-gaap_DepreciationAndAmortization 14,270us-gaap_DepreciationAndAmortization 15,833us-gaap_DepreciationAndAmortization  
Stock-based compensation expense 3,970us-gaap_ShareBasedCompensation 3,803us-gaap_ShareBasedCompensation 4,186us-gaap_ShareBasedCompensation  
Deferred income taxes (22,405)us-gaap_DeferredIncomeTaxExpenseBenefit (25,328)us-gaap_DeferredIncomeTaxExpenseBenefit (14,085)us-gaap_DeferredIncomeTaxExpenseBenefit  
Increase (decrease) in other liabilities (7,748)us-gaap_IncreaseDecreaseInAccruedLiabilities (1,536)us-gaap_IncreaseDecreaseInAccruedLiabilities 3,374us-gaap_IncreaseDecreaseInAccruedLiabilities  
Net cash provided by (used in) operating activities 56,654us-gaap_NetCashProvidedByUsedInOperatingActivities 164,354us-gaap_NetCashProvidedByUsedInOperatingActivities 211,834us-gaap_NetCashProvidedByUsedInOperatingActivities  
Investing activities        
Proceeds from calls and maturities of investment securities 101,420us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities 186,820us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities 269,236us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities  
Purchases of investment securities (147,854)us-gaap_PaymentsToAcquireAvailableForSaleSecurities (214,398)us-gaap_PaymentsToAcquireAvailableForSaleSecurities (1,022,772)us-gaap_PaymentsToAcquireAvailableForSaleSecurities  
Purchases of premises and equipment (10,609)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (7,295)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (25,502)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment  
Net cash provided by (used in) investing activities (83,978)us-gaap_NetCashProvidedByUsedInInvestingActivities (100,240)us-gaap_NetCashProvidedByUsedInInvestingActivities 10,034us-gaap_NetCashProvidedByUsedInInvestingActivities  
Financing activities        
Cash dividends paid on common stock (34,848)us-gaap_PaymentsOfDividendsCommonStock (61,429)us-gaap_PaymentsOfDividendsCommonStock (67,797)us-gaap_PaymentsOfDividendsCommonStock  
Treasury stock purchase (697)us-gaap_PaymentsForRepurchaseOfCommonStock (11,778)us-gaap_PaymentsForRepurchaseOfCommonStock (6,806)us-gaap_PaymentsForRepurchaseOfCommonStock  
Proceeds from exercise of stock options, net of shares purchased 1,056us-gaap_ProceedsFromStockOptionsExercised 73us-gaap_ProceedsFromStockOptionsExercised 320us-gaap_ProceedsFromStockOptionsExercised  
Excess tax benefit on share-based compensation 153us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 686us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 438us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities  
Net cash provided by (used in) financing activities 19,826us-gaap_NetCashProvidedByUsedInFinancingActivities (80,996)us-gaap_NetCashProvidedByUsedInFinancingActivities (237,019)us-gaap_NetCashProvidedByUsedInFinancingActivities  
Decrease in cash (7,498)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (16,882)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (15,151)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease  
Cash and Due from Banks at beginning of year 117,620us-gaap_CashAndDueFromBanks 134,502us-gaap_CashAndDueFromBanks 149,653us-gaap_CashAndDueFromBanks  
Cash and Due from Banks at end of year 110,122us-gaap_CashAndDueFromBanks 117,620us-gaap_CashAndDueFromBanks 134,502us-gaap_CashAndDueFromBanks  
Parent Company [Member]        
Statement of Financial Position [Abstract]        
Cash 55,192us-gaap_CashAndDueFromBanks
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
88,420us-gaap_CashAndDueFromBanks
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
106,196us-gaap_CashAndDueFromBanks
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Investment securities, available for sale 276us-gaap_AvailableForSaleSecurities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
229us-gaap_AvailableForSaleSecurities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Other investments 5,399us-gaap_OtherInvestments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
4,851us-gaap_OtherInvestments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Subordinated notes from subsidiaries 7,500us-gaap_NotesReceivableRelatedParties
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
7,500us-gaap_NotesReceivableRelatedParties
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Investment in subsidiaries 712,067us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
576,554us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Premises and equipment 1,431us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
1,455us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Other assets 13,870us-gaap_OtherAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
13,942us-gaap_OtherAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Total assets 795,735us-gaap_Assets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
692,951us-gaap_Assets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Dividends payable 10,249us-gaap_DividendsPayableCurrentAndNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
9,178us-gaap_DividendsPayableCurrentAndNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Other liabilities 1,409us-gaap_OtherLiabilities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
1,612us-gaap_OtherLiabilities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Total liabilities 11,658us-gaap_Liabilities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
10,790us-gaap_Liabilities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Shareholders’ equity 784,077us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
682,161us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Total liabilities and shareholders’ equity 795,735us-gaap_LiabilitiesAndStockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
692,951us-gaap_LiabilitiesAndStockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Income Statement [Abstract]        
Interest income 73us-gaap_InterestIncomeOperating
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
75us-gaap_InterestIncomeOperating
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
55us-gaap_InterestIncomeOperating
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Noninterest income 92us-gaap_NoninterestIncome
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0us-gaap_NoninterestIncome
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
421us-gaap_NoninterestIncome
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Dividends from subsidiaries 31,700ffbc_DividendsFromSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
58,700ffbc_DividendsFromSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
73,800ffbc_DividendsFromSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Total income 31,865us-gaap_Revenues
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
58,775us-gaap_Revenues
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
74,276us-gaap_Revenues
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Salaries and employee benefits 4,041us-gaap_LaborAndRelatedExpense
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
4,042us-gaap_LaborAndRelatedExpense
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
4,612us-gaap_LaborAndRelatedExpense
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Miscellaneous professional services 708us-gaap_ProfessionalFees
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
663us-gaap_ProfessionalFees
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
916us-gaap_ProfessionalFees
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Other 5,307us-gaap_OtherExpenses
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
5,059us-gaap_OtherExpenses
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
5,209us-gaap_OtherExpenses
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Total expenses 10,056us-gaap_OperatingExpenses
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
9,764us-gaap_OperatingExpenses
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
10,737us-gaap_OperatingExpenses
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Income before income taxes and equity in undistributed net earnings of subsidiaries 21,809us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
49,011us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
63,539us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Income tax benefit (3,674)us-gaap_IncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(3,659)us-gaap_IncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(3,869)us-gaap_IncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Equity in undistributed earnings (loss) of subsidiaries (39,517)us-gaap_IncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
4,321us-gaap_IncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
105us-gaap_IncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Net income 65,000us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
48,349us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
67,303us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Operating activities        
Net income 65,000us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
48,349us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
67,303us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Adjustments to reconcile net income to net cash provided by operating activities        
Equity in undistributed earnings (loss) of subsidiaries (39,517)us-gaap_IncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
4,321us-gaap_IncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
105us-gaap_IncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Depreciation and amortization 24us-gaap_DepreciationAndAmortization
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
26us-gaap_DepreciationAndAmortization
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
27us-gaap_DepreciationAndAmortization
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Stock-based compensation expense 3,970us-gaap_ShareBasedCompensation
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
3,803us-gaap_ShareBasedCompensation
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
4,186us-gaap_ShareBasedCompensation
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Deferred income taxes 180us-gaap_DeferredIncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(676)us-gaap_DeferredIncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(207)us-gaap_DeferredIncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
(Decrease) increase in dividends payable 1,071ffbc_IncreaseDecreaseInDividendsPayable
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(7,691)ffbc_IncreaseDecreaseInDividendsPayable
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
673ffbc_IncreaseDecreaseInDividendsPayable
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Increase (decrease) in other liabilities (1,654)us-gaap_IncreaseDecreaseInAccruedLiabilities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
7,719us-gaap_IncreaseDecreaseInAccruedLiabilities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(1,799)us-gaap_IncreaseDecreaseInAccruedLiabilities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Decrease (increase) in other assets (264)us-gaap_IncreaseDecreaseInOtherOperatingAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
1,266us-gaap_IncreaseDecreaseInOtherOperatingAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(139)us-gaap_IncreaseDecreaseInOtherOperatingAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Net cash provided by (used in) operating activities 28,810us-gaap_NetCashProvidedByUsedInOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
57,117us-gaap_NetCashProvidedByUsedInOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
70,149us-gaap_NetCashProvidedByUsedInOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Investing activities        
Capital contributions to subsidiaries (27,601)ffbc_Capitalcontributiontosubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0ffbc_Capitalcontributiontosubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0ffbc_Capitalcontributiontosubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Outlays for business acquisitions (17,065)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Proceeds from disposal of subsidiaries 18,695us-gaap_ProceedsFromDivestitureOfInterestInConsolidatedSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0us-gaap_ProceedsFromDivestitureOfInterestInConsolidatedSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0us-gaap_ProceedsFromDivestitureOfInterestInConsolidatedSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Proceeds from calls and maturities of investment securities 29us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
48us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Purchases of investment securities (192)us-gaap_PaymentsToAcquireAvailableForSaleSecurities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(88)us-gaap_PaymentsToAcquireAvailableForSaleSecurities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(474)us-gaap_PaymentsToAcquireAvailableForSaleSecurities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Purchases of premises and equipment 0us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(80)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Other 0us-gaap_PaymentsForProceedsFromOtherInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
307us-gaap_PaymentsForProceedsFromOtherInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
109us-gaap_PaymentsForProceedsFromOtherInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Net cash provided by (used in) investing activities (26,134)us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
187us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(365)us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Financing activities        
Cash dividends paid on common stock (34,848)us-gaap_PaymentsOfDividendsCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(61,429)us-gaap_PaymentsOfDividendsCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(67,797)us-gaap_PaymentsOfDividendsCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Treasury stock purchase (697)us-gaap_PaymentsForRepurchaseOfCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(11,778)us-gaap_PaymentsForRepurchaseOfCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(6,806)us-gaap_PaymentsForRepurchaseOfCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Proceeds from exercise of stock options, net of shares purchased 1,056us-gaap_ProceedsFromStockOptionsExercised
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
73us-gaap_ProceedsFromStockOptionsExercised
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
320us-gaap_ProceedsFromStockOptionsExercised
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Excess tax benefit on share-based compensation 153us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
686us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
438us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Other (1,568)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(2,632)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(1,400)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Net cash provided by (used in) financing activities (35,904)us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(75,080)us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(75,245)us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Decrease in cash (33,228)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(17,776)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(5,461)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Cash and Due from Banks at beginning of year 88,420us-gaap_CashAndDueFromBanks
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
106,196us-gaap_CashAndDueFromBanks
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
111,657us-gaap_CashAndDueFromBanks
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Cash and Due from Banks at end of year 55,192us-gaap_CashAndDueFromBanks
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
88,420us-gaap_CashAndDueFromBanks
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
106,196us-gaap_CashAndDueFromBanks
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Parent Company [Member] | Commercial Banks [Member]        
Statement of Financial Position [Abstract]        
Investment in subsidiaries 712,067us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ ffbc_SubsidiariesAxis
= ffbc_CommercialBanksMember
557,872us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ ffbc_SubsidiariesAxis
= ffbc_CommercialBanksMember
   
Parent Company [Member] | Nonbanks [Member]        
Statement of Financial Position [Abstract]        
Investment in subsidiaries $ 0us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ ffbc_SubsidiariesAxis
= ffbc_NonbanksMember
$ 18,682us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ ffbc_SubsidiariesAxis
= ffbc_NonbanksMember