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Acquisitions (Tables)
 9 Months Ended
Sep. 30, 2012
Business Combinations [Abstract]  
Activity for accretable yield includes contractually due interest of acquired loans
 
 
Nine Months Ended
 
 
September 30,
 
 
2012
 
2011
 
 
(In thousands)
Balance at beginning of period
 
$
43,359

 
$
72,863

Additions
 
—

 
—

Reductions
 
—

 
—

Accretion recognized in interest income
 
(18,481
)
 
(24,549
)
Reclassification from (to) nonaccretable difference
 
—

 
300

Balance at end of period
 
$
24,878

 
$
48,614