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Other Comprehensive Income
 3 Months Ended
Mar. 31, 2015
Equity [Abstract]  
Other Comprehensive Income
Other Comprehensive Income/Loss
    
The gross amounts of each component of other comprehensive income (loss) and the related tax effects are as follows:
 
Pre-tax
 
Tax Expense (Benefit)
 
Net of Tax
Three Months Ended March 31,
2015
 
2014
 
2015
 
2014
 
2015
 
2014
Investment securities available-for sale:
 
 
 
 
 
 
 
 
 
 
 
Change in net unrealized gains/losses
during period
$
10,608

 
$
14,351

 
$
4,174

 
$
5,647

 
$
6,434

 
$
8,704

Reclassification adjustment for net gains
 included in net income
(6
)
 
(71
)
 
(2
)
 
(28
)
 
(4
)
 
(43
)
Change in unamortized loss on available-
 for-sale securities transferred into held-to-
 maturity
451

 
—

 
177

 
—

 
274

 
—

Defined benefits post-retirement benefit plan:
 
 
 
 
 
 
 
 
 
 
 
Change in net actuarial loss
15

 
35

 
6

 
14

 
9

 
21

Total other comprehensive income
$
11,068

 
$
14,315

 
$
4,355

 
$
5,633

 
$
6,713

 
$
8,682


The components of accumulated other comprehensive loss, net of income tax benefits, are as follows:
 
March 31,
2015
 
December 31,
2014
Net unrealized gain (loss) on investment securities available-for-sale
$
4,583

 
$
(2,121
)
Net actuarial loss on defined benefit post-retirement benefit plans
(404
)
 
(413
)
Net accumulated other comprehensive gain (loss)
$
4,179

 
$
(2,534
)