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Acquired Loans Part 1 (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Feb. 15, 2013
Dec. 31, 2012
Jun. 30, 2012
Dec. 31, 2011
At acquisition date [Abstract]          
Contractually required principal and interest   $ 1,256,669      
Nonaccretable difference   193,962      
Cash flows expected to be collected   1,062,707      
Accretable yield (107,232) 99,504 (26,383) (27,064) (17,653)
FASB ASC Topic 310-20 discount   12,716      
Fair value of loans at acquisition   $ 950,487