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Shareholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2012
Accumulated Other Comprehensive Income [Abstract]  
Schedule of Comprehensive Income (Loss) [Table Text Block]
The following table presents changes in other comprehensive income for the years ended December 31: 
 
Before-Tax Amount
 
Tax Effect
 
Net of Tax Amount
 
(in thousands)
2012:
 
 
 
 
 
Unrealized gain (loss) on securities
$
2,414

 
$
(845
)
 
$
1,569

Reclassification adjustment for securities (gains) losses included in net income
(3,026
)
 
1,059

 
(1,967
)
Non-credit related unrealized gain (loss) on other-than-temporarily impaired debt securities
2,046

 
(716
)
 
1,330

Unrealized gain on derivative financial instruments
209

 
(73
)
 
136

Unrecognized pension and postretirement (cost) income
(6,470
)
 
2,263

 
(4,207
)
Amortization (accretion) of net unrecognized pension and postretirement income (cost)
1,321

 
(462
)
 
859

Total Other Comprehensive Income (Loss)
$
(3,506
)
 
$
1,226

 
$
(2,280
)
2011:
 
 
 
 
 
Unrealized gain (loss) on securities
$
13,489

 
$
(4,721
)
 
$
8,768

Reclassification adjustment for securities (gains) losses included in net income
(4,560
)
 
1,596

 
(2,964
)
Non-credit related unrealized gain (loss) on other-than-temporarily impaired debt securities
369

 
(129
)
 
240

Unrealized gain on derivative financial instruments
209

 
(73
)
 
136

Unrecognized pension and postretirement (cost) income
(16,418
)
 
5,746

 
(10,672
)
Amortization (accretion) of net unrecognized pension and postretirement income (cost)
(74
)
 
26

 
(48
)
Total Other Comprehensive Income (Loss)
$
(6,985
)
 
$
2,445

 
$
(4,540
)
2010:
 
 
 
 
 
Unrealized gain (loss) on securities
$
6,145

 
$
(2,151
)
 
$
3,994

Reclassification adjustment for securities (gains) losses included in net income
(700
)
 
245

 
(455
)
Non-credit related unrealized gain (loss) on other-than-temporarily impaired debt securities
(255
)
 
89

 
(166
)
Unrealized gain on derivative financial instruments
209

 
(73
)
 
136

Unrecognized pension and postretirement (cost) income
2,237

 
(783
)
 
1,454

Amortization (accretion) of net unrecognized pension and postretirement income (cost)
114

 
(40
)
 
74

Total Other Comprehensive Income (Loss)
$
7,750

 
$
(2,713
)
 
$
5,037
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
The following table presents changes in each component of accumulated other comprehensive income, net of tax, for the 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
 
Unrecognized Pension and Postretirement Plan Income (Cost)
 
Unrealized Effective Portions of Losses on Forward-Starting Interest Rate Swaps
 
Total
 
(in thousands)
Balance at December 31, 2009
$
24,975

 
$
(8,349
)
 
$
(5,942
)
 
$
(3,226
)
 
$
7,458

Current-period other comprehensive income (loss)
(2,621
)
 
5,994

 
1,528

 
136

 
5,037

Balance at December 31, 2010
$
22,354

 
$
(2,355
)
 
$
(4,414
)
 
$
(3,090
)
 
$
12,495

Current-period other comprehensive income (loss)
4,700

 
1,344

 
(10,720
)
 
136

 
(4,540
)
Balance at December 31, 2011
$
27,054

 
$
(1,011
)
 
$
(15,134
)
 
$
(2,954
)
 
$
7,955

Current-period other comprehensive income (loss)
(692
)
 
1,624

 
(3,348
)
 
136

 
(2,280
)
Balance at December 31, 2012
$
26,362

 
$
613

 
$
(18,482
)
 
$
(2,818
)
 
$
5,675