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Accumulated Other Comprehensive Loss (Tables)
 12 Months Ended
Dec. 31, 2017
Equity [Abstract]  
Components of accumulated other comprehensive loss, net of related tax benefit/expense
The following table summarizes the changes within each component of accumulated other comprehensive income (loss), net of related tax benefit/expense for the years ended December 31, 2017, 2016 and 2015:
(Dollars in thousands)
 
Unrealized gains
(losses) on securities
available-for-sale,
net of tax
 
Defined Benefit Pension Plans
 
Unrealized gains (losses) on cash flow hedges, net of tax
 
Total
For the year ended December 31, 2017
 
 
 
 
 
 
 
 
Beginning balance
 
$
(14,142
)
 
$
(25,894
)
 
$
—

 
$
(40,036
)
Other comprehensive loss before reclassifications
 
826

 
8,457

 
2,771

 
12,054

Amounts reclassified from accumulated other comprehensive income
 
4,802

 
1,139

 
1,061

 
7,002

Net current period other comprehensive income (loss)
 
5,628

 
9,596

 
3,832

 
19,056

Reclassification of certain deferred tax effects (1)
 
(1,834
)
 
(3,510
)
 
826

 
(4,518
)
Ending balance
 
$
(10,348
)
 
$
(19,808
)
 
$
4,658

 
$
(25,498
)
For the year ended December 31, 2016
 
 
 
 
 
 
 
 
Beginning balance
 
$
(1,888
)
 
$
(27,144
)
 
$
—

 
$
(29,032
)
Other comprehensive income (loss) before reclassifications
 
(12,170
)
 
(229
)
 
—

 
(12,399
)
Amounts reclassified from accumulated other comprehensive income
 
(84
)
 
1,479

 
—

 
1,395

Net current period other comprehensive income (loss)
 
(12,254
)
 
1,250

 
—

 
(11,004
)
Ending balance
 
$
(14,142
)
 
$
(25,894
)
 
$
—

 
$
(40,036
)
For the year ended December 31, 2015
 
 
 
 
 
 
 
 
Beginning balance
 
$
(210
)
 
$
(32,243
)
 
$
—

 
$
(32,453
)
Other comprehensive income (loss) before reclassifications
 
(1,269
)
 
2,443

 
—

 
1,174

Amounts reclassified from accumulated other comprehensive income
 
(409
)
 
2,656

 
—

 
2,247

Net current period other comprehensive income (loss)
 
(1,678
)
 
5,099

 
—

 
3,421

Ending balance
 
$
(1,888
)
 
$
(27,144
)
 
$
—

 
$
(29,032
)

(1) 
The reclassification from accumulated other comprehensive income (loss) to retained earnings was due to the early adoption of ASU 2018-02, see Note 1 for further information.
Summary of amounts reclassified out of accumulated other comprehensive income (loss)
The following table summarizes the amounts reclassified out of each component of accumulated other comprehensive income (loss) for the years ended December 31, 2017, 2016 and 2015:
(Dollars in thousands)
 
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)
 
Affected Line Item in the Income Statement
 
 
December 31, 2017
 
December 31, 2016
 
December 31, 2015
 
 
Gains and losses on available-for-sale securities
 
$
(7,388
)
 
$
129

 
$
630

 
Net gain on sale of investment securities (noninterest income)
 
 
2,586

 
(45
)
 
(221
)
 
Income tax (expense)/benefit
 
 
$
(4,802
)
 
$
84

 
$
409

 
Net Income
Amortization of defined benefit pension plan items
 
$
(1,752
)
 
$
(2,276
)
 
$
(4,086
)
 
Salaries, wages and employee benefits (operating expenses)
 
 
613

 
797

 
1,430

 
Income tax (expense)/benefit
 
 
$
(1,139
)
 
$
(1,479
)
 
$
(2,656
)
 
Net Income
Gains and losses on cash flow hedges
 
1,633

 
—

 
—

 
Interest on short-term borrowings (interest expense)
 
 
(572
)
 
—

 
—

 
Income tax (expense)/benefit
 
 
$
1,061

 
$
—

 
$
—

 
Net Income (loss)