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Acquisitions (Tables)
 3 Months Ended
Mar. 31, 2016
Business Acquisition [Line Items]  
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:
 
 
Lake Michigan
 
Monarch
 
North-western
 
OAK
 
Total
 
Three Months Ended March 31, 2016
 
(In thousands)
Balance at beginning of period
 
$
152,999

 
$
34,558

 
$
82,623

 
$
28,077

 
$
298,257

 
Additions (reductions)*
 
(6,071
)
 
128

 
(2,254
)
 
1,516

 
(6,681
)
 
Accretion recognized in interest income
 
(8,953
)
 
(1,451
)
 
(4,001
)
 
(2,557
)
 
(16,962
)
 
Balance at end of period
 
$
137,975

 
$
33,235

 
$
76,368

 
$
27,036

 
$
274,614

 
 
 
 
 
 
 
 
 
 
 
 
 
Three Months Ended March 31, 2015
 
 
 
 
 
 
 
 
 
 
 
Balance at beginning of period
 
 
 
 
 
$
104,675

 
$
33,286

 
$
137,961

 
Additions (reductions)*
 
 
 
 
 
(1,410
)
 
714

 
(696
)
 
Accretion recognized in interest income
 
 
 
 
 
(4,998
)
 
(3,207
)
 
(8,205
)
 
Balance at end of period
 


 


 
$
98,267

 
$
30,793

 
$
129,060

 
*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.