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SECURITIES: (Tables)
 12 Months Ended
Dec. 31, 2019
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, 2019
 
 
Amortized
 
Unrealized
 
 
(Dollar amounts in thousands)
 
Cost
 
Gains
 
Losses
 
Fair Value
U.S. Government entity mortgage-backed securities
 
$
102,490

 
$
1,293

 
$
(150
)
 
$
103,633

Mortgage-backed securities, residential
 
240,753

 
2,979

 
(350
)
 
243,382

Mortgage-backed securities, commercial
 
22,036

 
73

 
(5
)
 
22,104

Collateralized mortgage obligations
 
280,797

 
1,735

 
(1,221
)
 
281,311

State and municipal obligations
 
253,277

 
11,265

 
(108
)
 
264,434

Municipal taxable
 
728

 
2

 
—

 
730

U.S. Treasury
 
7,494

 
10

 
—

 
7,504

Collateralized debt obligations
 
—

 
3,619

 
—

 
3,619

TOTAL
 
$
907,575

 
$
20,976

 
$
(1,834
)
 
$
926,717

 
 
December 31, 2018
 
 
Amortized
 
Unrealized
 
 
(Dollar amounts in thousands)
 
Cost
 
Gains
 
Losses
 
Fair Value
U.S. Government entity mortgage-backed securities
 
$
25,617

 
$
218

 
$
(471
)
 
$
25,364

Mortgage-backed securities, residential
 
182,050

 
723

 
(4,030
)
 
178,743

Collateralized mortgage obligations
 
352,823

 
217

 
(9,424
)
 
343,616

State and municipal obligations
 
232,457

 
2,767

 
(1,289
)
 
233,935

Collateralized debt obligations
 
137

 
3,121

 
—

 
3,258

TOTAL
 
$
793,084

 
$
7,046

 
$
(15,214
)
 
$
784,916
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, 2019, 2018 and 2017, respectively.
(Dollar amounts in thousands)
 
2019
 
2018
 
2017
Proceeds
 
$
11,210

 
$
2,418

 
$
15,348

Gross gains
 
55

 
5

 
185

Gross losses
 
(11
)
 
(3
)
 
(126
)
Schedule of contractual maturities of debt securities
Contractual maturities of debt securities at year-end 2019 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
 
$
13,911

 
$
13,949

Due after one but within five years
 
60,624

 
61,502

Due after five but within ten years
 
61,255

 
63,193

Due after ten years
 
228,199

 
241,276

 
 
363,989

 
379,920

Mortgage-backed securities and collateralized mortgage obligations
 
543,586

 
546,797

TOTAL
 
$
907,575

 
$
926,717
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, 2019 and 2018.
 
 
December 31, 2019
 
 
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
 
$
29,183

 
$
(150
)
 
—

 
—

 
$
29,183

 
$
(150
)
Mortgage-backed securities, residential
 
55,665

 
(243
)
 
18,724

 
(107
)
 
74,389

 
(350
)
Mortgage-backed securities, commercial
 
4,391

 
(5
)
 
—

 
—

 
4,391

 
(5
)
Collateralized mortgage obligations
 
33,398

 
(314
)
 
61,781

 
(907
)
 
95,179

 
(1,221
)
State and municipal obligations
 
8,996

 
(61
)
 
461

 
(47
)
 
9,457

 
(108
)
Total temporarily impaired securities
 
$
131,633

 
$
(773
)
 
$
80,966

 
$
(1,061
)
 
$
212,599

 
$
(1,834
)
 
 
 
December 31, 2018
 
 
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
 
$
3,052

 
$
(4
)
 
$
11,356

 
$
(467
)
 
$
14,408

 
$
(471
)
Mortgage-backed securities, residential
 
39,997

 
(553
)
 
111,423

 
(3,477
)
 
151,420

 
(4,030
)
Collateralized mortgage obligations
 
52,838

 
(455
)
 
241,373

 
(8,969
)
 
294,211

 
(9,424
)
State and municipal obligations
 
34,229

 
(276
)
 
41,742

 
(1,013
)
 
75,971

 
(1,289
)
Total temporarily impaired securities
 
$
130,116

 
$
(1,288
)
 
$
405,894

 
$
(13,926
)
 
$
536,010

 
$
(15,214
)
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)
 
2019
 
2018
 
2017
Beginning balance, January 1,
 
$
2,974

 
$
7,132

 
$
13,974

Reductions for securities called during the period
 
—

 
(4,158
)
 
(6,842
)
Ending balance, December 31,
 
$
2,974

 
$
2,974

 
$
7,132