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Derivative Instruments (Narrative) (Detail) (USD $)
6 Months Ended
Jun. 30, 2012
Derivative [Line Items]  
Maximum Length of Time Hedged in Interest Rate Cash Flow Hedge 6 years
Net deferred gains (losses), net of tax, recorded in AOCI expected to be reclassified into earnings during the next 12 months $ 1,800,000
Interest rate lock commitments 160,600,000
Forward commitments for the future delivery of residential mortgage loans 195,900,000
Loans and mortgage loans held-for-sale 35,300,000
Foreign currency risk on loans 352,000
Warrants $ 19,000
Possible Minimum [Member]
 
Derivative [Line Items]  
Range of assigned internal risk ratings 1
Possible Maximum [Member]
 
Derivative [Line Items]  
Range of assigned internal risk ratings 8