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Shareholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2017
Accumulated Other Comprehensive Income [Abstract]  
Schedule of Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss)
The following table presents the components of other comprehensive income (loss) for the years ended December 31: 

 
Before-Tax Amount
 
Tax Effect
 
Net of Tax Amount
 
(in thousands)
2017:
 
 
 
 
 
Unrealized gain on securities
$
16,051

 
$
(5,619
)
 
$
10,432

Reclassification adjustment for securities gains included in net income (1)
(9,071
)
 
3,177

 
(5,894
)
Non-credit related unrealized loss on other-than-temporarily impaired debt securities
285

 
(100
)
 
185

Unrecognized pension and postretirement cost
(937
)
 
328

 
(609
)
Amortization of net unrecognized pension and postretirement income (2)
2,092

 
(731
)
 
1,361

Total Other Comprehensive Income
$
8,420

 
$
(2,945
)
 
$
5,475

2016:
 
 
 
 
 
Unrealized loss on securities
$
(22,907
)
 
$
8,016

 
$
(14,891
)
Reclassification adjustment for securities gains included in net income (1)
(2,550
)
 
893

 
(1,657
)
Non-credit related unrealized loss on other-than-temporarily impaired debt securities
(285
)
 
100

 
(185
)
Amortization of unrealized loss on derivative financial instruments (3)
25

 
(9
)
 
16

Unrecognized pension and postretirement cost
(1,432
)
 
501

 
(931
)
Amortization of net unrecognized pension and postretirement income (2)
1,869

 
(653
)
 
1,216

Total Other Comprehensive Loss
$
(25,280
)
 
$
8,848

 
$
(16,432
)
2015:
 
 
 
 
 
Unrealized loss on securities
$
(11,872
)
 
$
4,155

 
$
(7,717
)
Reclassification adjustment for securities gains included in net income (1)
(9,066
)
 
3,174

 
(5,892
)
Reclassification adjustment for loss on derivative financial instruments included in net income (2)
3,778

 
(1,322
)
 
2,456

Non-credit related unrealized gains on other-than-temporarily impaired debt securities
368

 
(129
)
 
239

Amortization of unrealized loss on derivative financial instruments (3)
115

 
(40
)
 
75

Unrecognized pension and postretirement income
7,200

 
(2,520
)
 
4,680

Amortization of net unrecognized pension and postretirement income (2)
2,869

 
(1,005
)
 
1,864

Total Other Comprehensive Loss
$
(6,608
)
 
$
2,313

 
$
(4,295
)


(1)
Amounts reclassified out of accumulated other comprehensive income (loss). Before-tax amounts included in "Investment securities gains, net" on the consolidated statements of income. See "Note 3 - Investment Securities," for additional details.
(2)
Amounts reclassified out of accumulated other comprehensive income (loss). Before-tax amounts included in "Salaries and employee benefits" on the consolidated statements of income. See "Note 13 - Employee Benefit Plans," for additional details.
(3)
Amounts reclassified out of accumulated other comprehensive income (loss). Before-tax amounts included in "Interest Expense" on the consolidated statements of income.
Schedule of Accumulated Other Comprehensive Income (Loss)
The following table presents changes in each component of accumulated other comprehensive income (loss), net of tax, for the years ended December 31: 
 
Unrealized Gain (Losses) on Investment Securities Not Other-Than-Temporarily Impaired
 
Unrealized Non-Credit Gains (Losses) on Other-Than-Temporarily Impaired Debt Securities
 
Unrealized Effective Portions of Losses on Forward-Starting Interest Rate Swaps
 
Unrecognized Pension and Postretirement Plan Income (Cost)
 
Total
 
(in thousands)
Balance as of December 31, 2014
$
5,980

 
$
1,349

 
$
(2,546
)
 
$
(22,505
)
 
$
(17,722
)
Other comprehensive income (loss) before reclassifications
(7,717
)
 
239

 
—

 
4,680

 
(2,798
)
Amounts reclassified from accumulated other comprehensive income (loss)
(4,762
)
 
(1,130
)
 
75

 
1,864

 
(3,953
)
Reclassification adjustment for loss on derivative financial instruments
—

 
—

 
2,456

 
—

 
2,456

Balance as of December 31, 2015
(6,499
)
 
458

 
(15
)
 
(15,961
)
 
(22,017
)
Other comprehensive loss before reclassifications
(14,891
)
 
(185
)
 
—

 
(931
)
 
(16,007
)
Amounts reclassified from accumulated other comprehensive income (loss)
(1,657
)
 
—

 
15

 
1,217

 
(425
)
Balance as of December 31, 2016
(23,047
)
 
273

 
—

 
(15,675
)
 
(38,449
)
Other comprehensive income before reclassifications
10,432

 
185

 
—

 
(609
)
 
10,008

Amounts reclassified from accumulated other comprehensive income (loss)
(5,894
)
 
—

 
—

 
1,361

 
(4,533
)
Balance as of December 31, 2017
$
(18,509
)
 
$
458

 
$
—

 
$
(14,923
)
 
$
(32,974
)