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Summary of Significant Accounting Policies - Narrative (Details) (USD $) | 12 Months Ended | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Core deposits | Dec. 31, 2011 Core deposits | Jan. 31, 2011 Directors | Dec. 31, 2012 Directors | Dec. 31, 2012 Commercial Loan | Dec. 31, 2012 Construction loan | Dec. 31, 2012 Residential mortgage | Dec. 31, 2012 Leases | Dec. 31, 2012 Ohio county | Dec. 31, 2012 Kentucky county
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Average required reserve balance | $ 41,000,000 | $ 38,100,000 |  |  |  |  |  |  |  |  |  |  |
Mortgage loans held for sale, carrying value | 25,743,000 | 11,500,000 |  |  |  |  |  |  |  |  |  |  |
Mortgage loans held for sale, contractual balance | 25,200,000 | 11,400,000 |  |  |  |  |  |  |  |  |  |  |
Expected gain on sale of mortgage loans held for sale | 568,000 | 182,000 |  |  |  |  |  |  |  |  |  |  |
Number of counties commercial loan is offered, by state |  |  |  |  |  |  |  |  |  |  |  | 28 | 1
Maximum real estate loan, as a percent of the underlying property |  |  |  |  |  |  |  | 85.00% |  | 80.00% |  |  |
Fixed rate residential mortgage term |  |  |  |  |  |  |  |  |  | 15 years |  |  |
Maximum term for a fixed interest rate option on loans |  |  |  |  |  |  |  | 5 years | 5 years |  |  |  |
Home equity line of credit limit, as a percent of the underlying property |  |  |  |  |  |  |  |  |  | 85.00% |  |  |
Historical loss period used in estimating loan loss reserve | 48 months |  |  |  |  |  |  | 48 months |  |  | 48 months |  |
Reserve coverage period in historical losses |  |  |  |  |  |  |  | 2 years 7 months 2 days |  |  | 1 year 6 months 8 days |  |
Accumulated amortization of core deposit intangibles |  |  |  | $ 21,800,000 | $ 19,600,000 |  |  |  |  |  |  |  |
Common stock granted to directors |  |  | 7,020 |  |  | 7,020 | 6,120 |  |  |  |  |  |

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