SECURITIES: (Tables)

12 Months Ended

Dec. 31, 2016

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, 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

	December 31, 2015
	Amortized		Unrealized
(Dollar amounts in thousands)	Cost		Gains		Losses			Fair Value
U.S. Government entity mortgage-backed securities	$	10,670	$	46	$	(23	)	$	10,693
Mortgage-backed securities, residential	208,705		5,089		(630		)	213,164
Mortgage-backed securities, commercial	9		—		—			9
Collateralized mortgage obligations	441,500		2,141		(6,007		)	437,634
State and municipal obligations	206,291		8,475		(59		)	214,707
Collateralized debt obligations	9,621		5,254		—			14,875
TOTAL	$	876,796	$	21,005	$	(6,719	)	$	891,082

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, 2016, 2015 and 2014, respectively.

(Dollar amounts in thousands)	2016			2015			2014
Proceeds	$	8,160		$	3,735		$	356
Gross gains	39			23			2
Gross losses	(5		)	(6		)	(5		)

Schedule of contractual maturities of debt securities

Contractual maturities of debt securities at year-end 2016 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	$	3,504	$	3,528
Due after one but within five years	50,148		51,043
Due after five but within ten years	87,829		90,009
Due after ten years	98,659		99,960
	240,140		244,540
Mortgage-backed securities and collateralized mortgage obligations	615,381		609,185
TOTAL	$	855,521	$	853,725

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, 2016 and 2015.

	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	)

	December 31, 2015
	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	$	9,455	$	(23	)	$	—	$	—		$	9,455	$	(23	)
Mortgage-backed securities, residential	69,940		(428		)	11,766		(202		)	81,706		(630		)
Collateralized mortgage obligations	151,484		(1,535		)	139,435		(4,472		)	290,919		(6,007		)
State and municipal obligations	3,547		(16		)	3,045		(43		)	6,592		(59		)
Total temporarily impaired securities	$	234,426	$	(2,002	)	$	154,246	$	(4,717	)	$	388,672	$	(6,719	)

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)	2016			2015			2014
Beginning balance, January 1,	$	13,995		$	14,050		$	14,079
Amounts related to credit loss for which other-than-
temporary impairment was not previously recognized	—			—			—
Amounts realized for securities sold during the period
Reductions for increase in cash flows expected to be collected
that are recognized over the remaining life of the security	(21		)	(55		)	(29		)
Increases to the amount related to the credit loss for which other-
than-temporary impairment was previously recognized	—			—			—
Ending balance, December 31,	$	13,974		$	13,995		$	14,050