SECURITIES: (Tables)

12 Months Ended

Dec. 31, 2020

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, 2020
	Amortized		Unrealized
(Dollar amounts in thousands)	Cost		Gains		Losses		Fair Value
U.S. Government entity mortgage-backed securities	$	92,710	$	5,105	$	(1)	$	97,814
Mortgage-backed securities, residential	346,606		8,794		(279)		355,121
Mortgage-backed securities, commercial	17,931		559		—		18,490
Collateralized mortgage obligations	209,556		4,761		(157)		214,160
State and municipal obligations	285,837		20,294		—		306,131
Municipal taxable	22,440		702		(3)		23,139
U.S. Treasury	2,750		3		—		2,753
Collateralized debt obligations	—		3,136		—		3,136
TOTAL	$	977,830	$	43,354	$	(440)	$	1,020,744

	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

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, 2020, 2019 and 2018, respectively.

(Dollar amounts in thousands)	2020		2019		2018
Proceeds	$	36,696	$	11,210	$	2,418
Gross gains	290		55		5
Gross losses	(57)		(11)		(3)

Schedule of contractual maturities of debt securities

Contractual maturities of debt securities at year-end 2020 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	$	13,168	$	13,304
Due after one but within five years	47,560		49,207
Due after five but within ten years	64,596		68,349
Due after ten years	278,413		302,113
	403,737		432,973
Mortgage-backed securities and collateralized mortgage obligations	574,093		587,771
TOTAL	$	977,830	$	1,020,744

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, 2020 and 2019.

	December 31, 2020
	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	$	—	$	—	944		(1)		$	944	$	(1)
Mortgage-backed securities, residential	76,962		(279)		—		—		76,962		(279)
Collateralized mortgage obligations	12,282		(108)		3,767		(49)		16,049		(157)
Municipal taxable	747		(3)		—		—		747		(3)
U.S. Treasury	250		—		—		—		250		—
Total temporarily impaired securities	$	90,241	$	(390)	$	4,711	$	(50)	$	94,952	$	(440)

	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)

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)	2020		2019		2018
Beginning balance, January 1,	$	2,974	$	2,974	$	7,132
Reductions for securities called during the period	—		—		(4,158)
Ending balance, December 31,	$	2,974	$	2,974	$	2,974