Derivative Financial Instruments (Narrative) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Derivative [Line Items]
Notional amount	$ 192.5	$ 195.0
Receive-Fixed Interest Swaps [Member]
Derivative [Line Items]
Notional amount	92.5	95.0
Receive-Fixed Interest Swaps On Commercial Loans [Member]
Derivative [Line Items]
Notional amount	100.0	100.0
Interest Rate Lock Commitments [Member]
Derivative [Line Items]
Notional amount	8.7	7.7
Forward Commitments [Member]
Derivative [Line Items]
Notional amount	10.2	9.3
Customer Derivative Instruments [Member]
Derivative [Line Items]
Notional amount	448.5	419.2
Offsetting Counterparty Derivative Instruments [Member]
Derivative [Line Items]
Notional amount	448.5	419.2
Integra Bank [Member] | Customer Derivative Instruments [Member]
Derivative [Line Items]
Notional amount	$ 66.7