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Deposits (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Deposits [Abstract]      
Noninterest-bearing demand deposits $ 2,033,442 $ 1,636,625  
Interest-bearing demand 1,463,640 1,474,045  
Savings 2,051,701 1,809,116  
Time 2,017,580 2,124,781  
Total deposits 7,566,363 7,044,567  
Interest expense on deposits by type [Abstract]      
Interest-bearing demand 7,077 8,621 9,515
Savings 8,144 8,479 10,613
Time 21,073 31,557 58,758
Total 36,294 48,657 78,886
Contractual Maturities, Time Deposits, $100,000 or More      
3 months or less 217,577 283,010  
Over 3 months through 6 months 177,519 203,216  
Over 6 months through 12 months 256,773 272,325  
Over 12 months 166,658 152,669  
Total 818,527 911,220  
Maturities of interest-bearing deposits [Abstract]      
2012 1,572,580    
2013 207,972    
2014 189,538    
2015 27,202    
2016 and thereafter 20,288    
Total time deposits 2,017,580 2,124,781  
Interest-bearing deposits with no stated maturity 3,515,341    
Total interest-bearing deposits $ 5,532,921 $ 5,407,942