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SECURITIES: (Tables)
 12 Months Ended
Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]  
Amortized cost and fair value of investments classified as available-for-sale
The fair value of securities available-for-sale and related gross unrealized gains and losses recognized in accumulated other comprehensive income were as follows:
 
 
December 31, 2014
 
 
Amortized
 
Unrealized
 
 
(Dollar amounts in thousands)
 
Cost
 
Gains
 
Losses
 
Fair Value
U.S. Government entity mortgage-backed securities
 
$
1,411

 
$
56

 
$
—

 
$
1,467

Mortgage-backed securities, residential
 
180,673

 
7,593

 
(330
)
 
187,936

Mortgage-backed securities, commercial
 
17

 
—

 
—

 
17

Collateralized mortgage obligations
 
489,765

 
2,513

 
(7,623
)
 
484,655

State and municipal obligations
 
198,875

 
9,019

 
(219
)
 
207,675

Collateralized debt obligations
 
10,205

 
5,115

 
(17
)
 
15,303

TOTAL
 
$
880,946

 
$
24,296

 
$
(8,189
)
 
$
897,053

 
 
December 31, 2013
 
 
Amortized
 
Unrealized
 
 
(Dollar amounts in thousands)
 
Cost
 
Gains
 
Losses
 
Fair Value
U.S. Government entity mortgage-backed securities
 
$
1,623

 
$
10

 
$
—

 
$
1,633

Mortgage-backed securities, residential
 
191,995

 
7,761

 
(1,992
)
 
197,764

Mortgage-backed securities, commercial
 
4,642

 
1

 
(252
)
 
4,391

Collateralized mortgage obligations
 
521,148

 
1,492

 
(15,899
)
 
506,741

State and municipal obligations
 
190,521

 
6,388

 
(1,922
)
 
194,987

Collateralized debt obligations
 
10,968

 
4,695

 
(6,619
)
 
9,044

TOTAL
 
$
920,897

 
$
20,347

 
$
(26,684
)
 
$
914,560
Schedule Of Gross Gain Or Loss realised
Below is a summary of the gross gains and losses realized by the Corporation on investment sales during the years ended December 31, 2014, 2013 and 2012, respectively.
 
(Dollar amounts in thousands)
 
2014
 
2013
 
2012
Proceeds
 
$
356

 
$
5,110

 
$
25,812

Gross gains
 
—

 
423

 
891

Gross losses
 
(1
)
 
—

 
(5
)
Schedule of contractual maturities of debt securities
Contractual maturities of debt securities at year-end 2014 were as follows. Securities not due at a single maturity or with no maturity date, primarily mortgage-backed and collateralized mortgage obligations, are shown separately.
 
 
Available-for-Sale
 
 
Amortized
 
Fair
(Dollar amounts in thousands)
 
Cost
 
Value
Due in one year or less
 
$
7,607

 
$
7,700

Due after one but within five years
 
37,409

 
38,891

Due after five but within ten years
 
86,911

 
90,908

Due after ten years
 
78,564

 
86,946

 
 
210,491

 
224,445

Mortgage-backed securities and collateralized mortgage obligations
 
670,455

 
672,608

TOTAL
 
$
880,946

 
$
897,053
Schedule of gross unrealized losses and fair value, aggregated by investment category and length of time that individual securities have been in continuous unrealized loss position
The following tables show the securities' gross unrealized losses and fair value, aggregated by investment category and length of time that individual securities have been in continuous unrealized loss position, at December 31, 2014 and 2013.
 
 
December 31, 2014
 
 
Less Than 12 Months
 
More Than 12 Months
 
Total
 
 
 
 
Unrealized
 
 
 
Unrealized
 
 
 
Unrealized
(Dollar amounts in thousands)
 
Fair Value
 
Losses
 
Fair Value
 
Losses
 
Fair Value
 
Losses
Mortgage-backed securities, residential
 
$
—

 
$
—

 
$
23,849

 
$
(330
)
 
$
23,849

 
$
(330
)
Collateralized mortgage obligations
 
50,832

 
(128
)
 
264,940

 
(7,495
)
 
315,772

 
(7,623
)
State and municipal obligations
 
6,500

 
(35
)
 
10,547

 
(184
)
 
17,047

 
(219
)
Collateralized debt obligations
 
—

 
—

 
200

 
(17
)
 
200

 
(17
)
Total temporarily impaired securities
 
$
57,332

 
$
(163
)
 
$
299,536

 
$
(8,026
)
 
$
356,868

 
$
(8,189
)
 
 
 
December 31, 2013
 
 
Less Than 12 Months
 
More Than 12 Months
 
Total
 
 
 
 
Unrealized
 
 
 
Unrealized
 
 
 
Unrealized
(Dollar amounts in thousands)
 
Fair Value
 
Losses
 
Fair Value
 
Losses
 
Fair Value
 
Losses
Mortgage-backed securities, residential
 
$
52,524

 
$
(1,645
)
 
$
6,022

 
$
(347
)
 
$
58,546

 
$
(1,992
)
Mortgage-backed securities, commercial
 
—

 
—

 
4,357

 
(252
)
 
4,357

 
(252
)
Collateralized mortgage obligations
 
406,291

 
(13,979
)
 
29,588

 
(1,920
)
 
435,879

 
(15,899
)
State and municipal obligations
 
43,899

 
(1,746
)
 
2,305

 
(176
)
 
46,204

 
(1,922
)
Collateralized debt obligations
 
—

 
—

 
3,686

 
(6,619
)
 
3,686

 
(6,619
)
Total temporarily impaired securities
 
$
502,714

 
$
(17,370
)
 
$
45,958

 
$
(9,314
)
 
$
548,672

 
$
(26,684
)
Rollforward of the credit losses recognized in earnings
The table below presents a rollforward of the credit losses recognized in earnings for the years presented:
 
(Dollar amounts in thousands)
 
2014
 
2013
 
2012
Beginning balance, January 1,
 
$
14,079

 
$
14,983

 
$
15,180

Amounts related to credit loss for which other-than-
 
 

 
 

 
 

temporary impairment was not previously recognized
 


 


 
11

Amounts realized for securities sold during the period
 


 


 
(208
)
Reductions for increase in cash flows expected to be collected
 
 

 
 

 
 

that are recognized over the remaining life of the security
 
(29
)
 
(904
)
 
—

Increases to the amount related to the credit loss for which other-
 
 

 
 

 
 

than-temporary impairment was previously recognized
 
—

 
—

 
—

Ending balance, December 31,
 
$
14,050

 
$
14,079

 
$
14,983