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Other Comprehensive Income
 3 Months Ended
Mar. 31, 2017
Equity [Abstract]  
Other Comprehensive Income
Other Comprehensive Income/Loss
    
The gross amounts of each component of other comprehensive income and the related tax effects are as follows:
 
Pre-tax
 
Tax (Expense) Benefit
 
Net of Tax
Three Months Ended March 31,
2017
 
2016
 
2017
 
2016
 
2017
 
2016
Investment securities available-for sale:
 
 
 
 
 
 
 
 
 
 
 
Change in net unrealized gains during period
$
9,354

 
$
8,613

 
$
3,681

 
$
3,360

 
$
5,673

 
$
5,253

Reclassification adjustment for net (gains) losses included in net income
(2
)
 
21

 
(1
)
 
8

 
(1
)
 
13

Change in unamortized loss on available-
 for-sale securities transferred into held-to-
 maturity
463

 
465

 
182

 
183

 
281

 
282

Unrealized (gain) loss on derivatives
49

 
(2,197
)
 
19

 
(835
)
 
30

 
(1,362
)
Defined benefits post-retirement benefit plan:
 
 
 
 
 
 
 
 
 
 
 
Change in net actuarial (gain) loss
(739
)
 
15

 
(291
)
 
6

 
(448
)
 
9

Total other comprehensive income
$
9,125

 
$
6,917

 
$
3,590

 
$
2,722

 
$
5,535

 
$
4,195

 
 
 
 
 
 
 
 
 
 
 
 
The components of accumulated other comprehensive loss, net of related tax effects, are as follows:
 
March 31,
2017
 
December 31,
2016
Net unrealized loss on investment securities available-for-sale
$
(4,190
)
 
$
(10,143
)
Net unrealized gain on derivatives
1,590

 
2,038

Net actuarial gain (loss) on defined benefit post-retirement benefit plans
7

 
(23
)
Net accumulated other comprehensive loss
$
(2,593
)
 
$
(8,128
)