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Other Comprehensive Income
 6 Months Ended
Jun. 30, 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 June 30,
2017
 
2016
 
2017
 
2016
 
2017
 
2016
Investment securities available-for sale:
 
 
 
 
 
 
 
 
 
 
 
Change in net unrealized gains during period
$
8,006

 
$
10,043

 
$
3,298

 
$
3,947

 
$
4,708

 
$
6,096

Reclassification adjustment for net (gains) losses included in net income
(5
)
 
(108
)
 
(2
)
 
(42
)
 
(3
)
 
(66
)
Change in unamortized loss on available-
 for-sale securities transferred into held-to-
 maturity
464

 
452

 
191

 
170

 
273

 
282

Unrealized (gain) loss on derivatives
(486
)
 
(804
)
 
(201
)
 
(305
)
 
(285
)
 
(499
)
Defined benefits post-retirement benefit plan:
 
 
 
 
 
 
 
 
 
 
 
Change in net actuarial (gain) loss
(176
)
 
13

 
(72
)
 
5

 
(104
)
 
8

Total other comprehensive income
$
7,803

 
$
9,596

 
$
3,214

 
$
3,775

 
$
4,589

 
$
5,821

 
 
 
 
 
 
 
 
 
 
 
 
 
Pre-tax
 
Tax Expense (Benefit)
 
Net of Tax
Six Months Ended June 30,
2017
 
2016
 
2017
 
2016
 
2017
 
2016
Investment securities available-for sale:
 
 
 
 
 
 
 
 
 
 
 
Change in net unrealized gains during period
$
17,365

 
$
18,671

 
$
6,985

 
$
7,322

 
$
10,380

 
$
11,349

Reclassification adjustment for net gains included in net income
(7
)
 
(87
)
 
(3
)
 
(34
)
 
(4
)
 
(53
)
Change in unamortized loss on available-
 for-sale securities transferred into held-to-
 maturity
929

 
904

 
374

 
340

 
555

 
564

Unrealized loss on derivatives
(437
)
 
(3,002
)
 
(176
)
 
(1,141
)
 
(261
)
 
(1,861
)
Defined benefits post-retirement benefit plan:
 
 
 
 
 
 
 
 
 
 
 
Change in net actuarial loss
(914
)
 
28

 
(368
)
 
11

 
(546
)
 
17

Total other comprehensive income
$
16,936

 
$
16,514

 
$
6,812

 
$
6,498

 
$
10,124

 
$
10,016


The components of accumulated other comprehensive loss, net of related tax effects, are as follows:
 
June 30,
2017
 
December 31,
2016
Net unrealized gain (loss) on investment securities available-for-sale
$
947

 
$
(10,143
)
Net realized gain (loss) on derivatives
(434
)
 
(23
)
Net actuarial gain (loss) on defined benefit post-retirement benefit plans
1,483

 
2,038

Net accumulated other comprehensive gain (loss)
$
1,996

 
$
(8,128
)