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Loans Receivable (Accretable yield and non-accretable discount activity) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]    
Additions accretable $ 0   
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Non Accretable Discount Movement Schedule [Roll Forward]    
Additions non-accretable 0   
Acquired under ASC 310-30 Non-Covered Loans [Member]
    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]    
Balance at beginning of period 517,553 655,833
Accretion Accretable (40,269) (47,668)
Transfer from (to) non-accretable discount 4,717 0
Balance at end of period 482,001 608,165
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Non Accretable Discount Movement Schedule [Roll Forward]    
Balance at beginning of period 579,587 714,462
Principal Losses (11,576) (8,746)
Transfer (to) from accretable yield (4,717) 0
Balance at end of period $ 563,294 $ 705,716