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Other Comprehensive Income/Loss (Tables)
 9 Months Ended
Sep. 30, 2017
Equity [Abstract]  
Schedule of 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 September 30,
2017
 
2016
 
2017
 
2016
 
2017
 
2016
Investment securities available-for sale:
 
 
 
 
 
 
 
 
 
 
 
Change in net unrealized gains during period
$
(1,812
)
 
$
(3,430
)
 
$
(845
)
 
$
(1,359
)
 
$
(967
)
 
$
(2,071
)
Reclassification adjustment for net gains included in net income
(771
)
 
(225
)
 
(360
)
 
(89
)
 
(411
)
 
(136
)
Change in unamortized loss on available-
 for-sale securities transferred into held-to-
 maturity
465

 
490

 
217

 
209

 
248

 
281

Unrealized (gain) loss on derivatives
(658
)
 
512

 
(307
)
 
195

 
(351
)
 
317

Reclassification adjustment for derivatives net (gains) losses included in income
1,128

 
—

 
526

 
—

 
602

 
—

Defined benefits post-retirement benefit plan:
 
 
 
 
 
 
 
 
 
 
 
Change in net actuarial (gain) loss
(176
)
 
15

 
(82
)
 
6

 
(94
)
 
9

Total other comprehensive income
$
(1,824
)
 
$
(2,638
)
 
$
(851
)
 
$
(1,038
)
 
$
(973
)
 
$
(1,600
)
 
 
 
 
 
 
 
 
 
 
 
 
 
Pre-tax
 
Tax Expense (Benefit)
 
Net of Tax
Nine Months Ended September 30,
2017
 
2016
 
2017
 
2016
 
2017
 
2016
Investment securities available-for sale:
 
 
 
 
 
 
 
 
 
 
 
Change in net unrealized gains during period
$
15,553

 
$
15,241

 
$
6,135

 
$
5,963

 
$
9,418

 
$
9,278

Reclassification adjustment for net gains included in net income
(778
)
 
(312
)
 
(307
)
 
(123
)
 
(471
)
 
(189
)
Change in unamortized loss on available-
 for-sale securities transferred into held-to-
 maturity
1,394

 
1,394

 
550

 
549

 
844

 
845

Unrealized loss on derivatives
(1,095
)
 
(2,490
)
 
(432
)
 
(946
)
 
(663
)
 
(1,544
)
Reclassification adjustment for derivatives net (gains) losses included in income
1,128

 
—

 
445

 
—

 
683

 
—

Defined benefits post-retirement benefit plan:
 
 
 
 
 
 
 
 
 
 
 
Change in net actuarial loss
(1,090
)
 
43

 
(430
)
 
17

 
(660
)
 
26

Total other comprehensive income
$
15,112

 
$
13,876

 
$
5,961

 
$
5,460

 
$
9,151

 
$
8,416
Schedule of Accumulated Other Comprehensive Income (Loss)
The components of accumulated other comprehensive loss, net of related tax effects, are as follows:
 
September 30,
2017
 
December 31,
2016
Net unrealized gain (loss) on investment securities available-for-sale
$
(353
)
 
$
(10,143
)
Net unrealized gain (loss) on derivatives
—

 
(23
)
Net actuarial gain (loss) on defined benefit post-retirement benefit plans
1,376

 
2,038

Net accumulated other comprehensive gain (loss)
$
1,023

 
$
(8,128
)