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SECURITIES: (Tables)
 12 Months Ended
Dec. 31, 2017
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, 2017
 
 
Amortized
 
Unrealized
 
 
(Dollar amounts in thousands)
 
Cost
 
Gains
 
Losses
 
Fair Value
U.S. Government entity mortgage-backed securities
 
$
13,989

 
$
24

 
$
(318
)
 
$
13,695

Mortgage-backed securities, residential
 
215,079

 
2,071

 
(1,812
)
 
215,338

Mortgage-backed securities, commercial
 
1

 
—

 
—

 
1

Collateralized mortgage obligations
 
346,005

 
370

 
(6,705
)
 
339,670

State and municipal obligations
 
227,651

 
4,671

 
(700
)
 
231,622

Collateralized debt obligations
 
8,644

 
5,961

 
—

 
14,605

TOTAL
 
$
811,369

 
$
13,097

 
$
(9,535
)
 
$
814,931

 
 
December 31, 2016
 
 
Amortized
 
Unrealized
 
 
(Dollar amounts in thousands)
 
Cost
 
Gains
 
Losses
 
Fair Value
U.S. Government entity mortgage-backed securities
 
$
13,594

 
$
32

 
$
(377
)
 
$
13,249

Mortgage-backed securities, residential
 
261,878

 
3,200

 
(4,073
)
 
261,005

Mortgage-backed securities, commercial
 
4

 
—

 
—

 
4

Collateralized mortgage obligations
 
353,499

 
1,021

 
(6,344
)
 
348,176

State and municipal obligations
 
217,365

 
3,954

 
(2,396
)
 
218,923

Collateralized debt obligations
 
9,181

 
4,411

 
(1,224
)
 
12,368

TOTAL
 
$
855,521

 
$
12,618

 
$
(14,414
)
 
$
853,725
Schedule Of Gross Gain Or Loss realised
Below is a summary of the gross gains and losses realized by the Corporation on investment sales and calls during the years ended December 31, 2017, 2016 and 2015, respectively.
(Dollar amounts in thousands)
 
2017
 
2016
 
2015
Proceeds
 
$
15,348

 
$
8,160

 
$
3,735

Gross gains
 
185

 
39

 
23

Gross losses
 
(126
)
 
(5
)
 
(6
)
Schedule of contractual maturities of debt securities
Contractual maturities of debt securities at year-end 2017 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
 
$
4,683

 
$
4,701

Due after one but within five years
 
30,765

 
31,338

Due after five but within ten years
 
83,483

 
85,726

Due after ten years
 
131,353

 
138,157

 
 
250,284

 
259,922

Mortgage-backed securities and collateralized mortgage obligations
 
561,085

 
555,009

TOTAL
 
$
811,369

 
$
814,931
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, 2017 and 2016.
 
 
December 31, 2017
 
 
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
U.S. Government entity mortgage-backed securities
 
$
9,321

 
$
(86
)
 
3,538

 
(232
)
 
$
12,859

 
$
(318
)
Mortgage-backed securities, residential
 
79,918

 
(425
)
 
53,815

 
(1,387
)
 
133,733

 
(1,812
)
Collateralized mortgage obligations
 
150,182

 
(1,418
)
 
146,750

 
(5,287
)
 
296,932

 
(6,705
)
State and municipal obligations
 
27,347

 
(183
)
 
18,660

 
(517
)
 
46,007

 
(700
)
Total temporarily impaired securities
 
$
266,768

 
$
(2,112
)
 
$
222,763

 
$
(7,423
)
 
$
489,531

 
$
(9,535
)
 
 
 
December 31, 2016
 
 
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
U.S. Government entity mortgage-backed securities
 
$
12,224

 
$
(377
)
 
$
—

 
$
—

 
$
12,224

 
$
(377
)
Mortgage-backed securities, residential
 
202,248

 
(4,072
)
 
152

 
(1
)
 
202,400

 
(4,073
)
Collateralized mortgage obligations
 
169,717

 
(3,086
)
 
79,999

 
(3,258
)
 
249,716

 
(6,344
)
State and municipal obligations
 
72,852

 
(2,396
)
 
—

 
—

 
72,852

 
(2,396
)
Collateralized debt obligations
 
7,561

 
(1,224
)
 
—

 
—

 
7,561

 
(1,224
)
Total temporarily impaired securities
 
$
464,602

 
$
(11,155
)
 
$
80,151

 
$
(3,259
)
 
$
544,753

 
$
(14,414
)
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)
 
2017
 
2016
 
2015
Beginning balance, January 1,
 
$
13,974

 
$
13,995

 
$
14,050

Amounts related to credit loss for which other-than-
 
 

 
 

 
 

temporary impairment was not previously recognized
 
—

 
—

 
—

Reductions for securities called during the period
 
(6,842
)
 


 


Reductions for increase in cash flows expected to be collected
 
 

 
 

 
 

that are recognized over the remaining life of the security
 
—

 
(21
)
 
(55
)
Increases to the amount related to the credit loss for which other-
 
 

 
 

 
 

than-temporary impairment was previously recognized
 
—

 
—

 
—

Ending balance, December 31,
 
$
7,132

 
$
13,974

 
$
13,995