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Acquisitions (Tables)
 3 Months Ended
Mar. 31, 2015
Business Combinations [Abstract]  
Activity for accretable yield includes contractually due interest of acquired loans
Activity for the accretable yield, which includes contractually due interest for acquired loans that have been renewed or extended since the date of acquisition and continue to be accounted for in loan pools in accordance with ASC 310-30, follows:
 
 
Three Months Ended March 31,
 
 
2015
 
2014
 
 
Northwestern
 
OAK
 
Total
 
OAK
 
 
(In thousands)
Balance at beginning of period
 
$
104,675

 
$
33,286

 
137,961

 
$
32,610

Additions (reductions)*
 
(1,410
)
 
714

 
(696
)
 
821

Accretion recognized in interest income
 
(4,998
)
 
(3,207
)
 
(8,205
)
 
(3,843
)
Reclassification from nonaccretable difference
 
—

 
—

 
—

 
10,000

Balance at end of period
 
$
98,267

 
$
30,793

 
$
129,060

 
$
39,588

*
Represents additions of estimated contractual interest expected to be collected from acquired loans being renewed or extended, less reductions in contractual interest resulting from the early payoff of acquired loans.