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Comprehensive Income/Loss (Tables)
 3 Months Ended
Mar. 31, 2017
Equity [Abstract]  
Comprehensive income
The following table presents a reconciliation of the changes in the components of other comprehensive income (loss) for the dates indicated, including the amount of income tax (expense) benefit allocated to each component of other comprehensive income (loss):
 
Three Months Ended
March 31, 2017
 
Pre Tax
Amount
 
Tax (Expense)
Benefit
 
After Tax
Amount
 
(Dollars in thousands)
Change in fair value of securities available for sale
$
896

 
$
(364
)
 
$
532

Less: net security gains reclassified into other noninterest income (expense)
1

 
—

 
1

Net change in fair value of securities available for sale
895

 
(364
)
 
531

 
 
 
 
 
 
Change in fair value of cash flow hedges
58

 
(24
)
 
34

Less: net cash flow hedge losses reclassified into interest on borrowings expense (1)
(93
)
 
38

 
(55
)
Net change in fair value of cash flow hedges
151

 
(62
)
 
89

 
 
 
 
 
 
Net unamortized loss related to defined benefit pension and other postretirement adjustments arising during the period
(7
)
 
3

 
(4
)
Amortization of net actuarial losses
70

 
(29
)
 
41

Amortization of net prior service costs
69

 
(28
)
 
41

Net change in other comprehensive income for defined benefit postretirement plans (2)
132

 
(54
)
 
78

Total other comprehensive income
$
1,178

 
$
(480
)
 
$
698

 
Three Months Ended
March 31, 2016
 
Pre Tax
Amount
 
Tax (Expense)
Benefit
 
After Tax
Amount
 
(Dollars in thousands)
Change in fair value of securities available for sale
$
6,708

 
$
(2,610
)
 
$
4,098

Less: net security losses reclassified into other noninterest income
(29
)
 
12

 
(17
)
Net change in fair value of securities available for sale
6,679

 
(2,598
)
 
4,081

 
 
 
 
 
 
Change in fair value of cash flow hedges
(456
)
 
188

 
(268
)
Less: net cash flow hedge losses reclassified into interest on borrowings expense (1)
(661
)
 
270

 
(391
)
Net change in fair value of cash flow hedges
205

 
(82
)
 
123

 
 
 
 
 
 
Net unamortized loss related to defined benefit pension and other postretirement adjustments arising during the period
(28
)
 
11

 
(17
)
Amortization of net actuarial losses
61

 
(25
)
 
36

Amortization of net prior service credits
69

 
(28
)
 
41

Net change in other comprehensive income for defined benefit postretirement plans (2)
102

 
(42
)
 
60

Total other comprehensive income
$
6,986

 
$
(2,722
)
 
$
4,264

 
(1)
Includes the amortization of the remaining balance of a realized but unrecognized gain, net of tax, from the termination of interest rate swaps in 2009. The original gain of $1.4 million, net of tax, is being recognized in earnings through December 2018, the original maturity date of the swap. The balance of this gain has amortized to $245,000 and $281,000 at March 31, 2017 and December 31, 2016, respectively.

(2)
The amortization of prior service costs is included in the computation of net periodic pension cost as disclosed in the Employee Benefit Plans footnote in the Company's Annual Report on Form 10-K for the year ended December 31, 2016, filed with the Securities and Exchange Commission.
Company's accumulated other comprehensive loss, net of tax
Information on the Company’s accumulated other comprehensive income (loss), net of tax, is comprised of the following components as of the periods indicated:
 
Unrealized Gain on Securities
 
Unrealized Gain (Loss) on Cash Flow Hedge
 
Deferred Gain on Hedge Transactions
 
Defined Benefit Postretirement Plans
 
Accumulated Other Comprehensive Income (Loss)
 
(Dollars in thousands)
 
2017
Beginning balance: January 1, 2017
$
173

 
$
361

 
$
281

 
$
(2,152
)
 
$
(1,337
)
Net change in other comprehensive income (loss)
531

 
125

 
(36
)
 
78

 
698

Ending balance: March 31, 2017
$
704

 
$
486

 
$
245

 
$
(2,074
)
 
$
(639
)
 
2016
Beginning balance: January 1, 2016
$
1,306

 
$
(1,955
)
 
$
427

 
$
(2,230
)
 
$
(2,452
)
Net change in other comprehensive income (loss)
4,081

 
161

 
(38
)
 
60

 
4,264

Ending balance: March 31, 2016
$
5,387

 
$
(1,794
)
 
$
389

 
$
(2,170
)
 
$
1,812