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Acquisitions (Narrative) (Details) (USD $)
 3 Months Ended
Jun. 30, 2013
Sep. 30, 2012
Oct. 31, 2012
South Valley Bank [Member]
branches
Jun. 30, 2013
Fair Value Adjustment [Member]
South Valley Bank [Member]
Oct. 31, 2012
Recorded Book Values [Member]
South Valley Bank [Member]
Business Acquisition [Line Items]          
Loans receivable, net     $ 361,200,000   $ 382,634,000
Covered loans receivable, net     107,946,000   107,075,000
Customer accounts     737,395,000   735,415,000
Transaction deposits acquired 3,448,583,000 2,946,453,000     533,000,000
Number of branches acquired (in branches)     24    
Total considerartion     43,895,000    
Equity Issued     33,492,000    
Cash paid     10,403,000    
Potential reduction in purchase price, earn-out assets     14,000,000    
Earn-out assets accrued     5,000,000    
Decrease in real estate held for sale       2,394,000  
Increase in goodwill       1,517,000  
Increase in other assets       $ 854,000