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Significant Accounting Policies - Additional Cash Flow Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Supplemental Cash Flow Information [Line Items]    
Cash paid for interest $ 6,056 $ 9,377
Cash paid for income tax      
Loans foreclosed and transferred to other real estate owned and foreclosed assets 274 1,071
Deferred gain on sale of building and parking garage 1,318  
Accretion of preferred stock $ 137