Securities (Tables)

12 Months Ended

Dec. 31, 2017

Investments, Debt and Equity Securities [Abstract]

Schedule of amortized cost and estimated fair value of investments in securities

The amortized cost and estimated fair value of investments in securities at December 31, 2017 and 2016 were as follows (dollars in thousands):

	December 31, 2017
	Amortized Cost		Unrealized Gains		Unrealized Losses		Fair Value
Securities available for sale:
Federal agencies and GSEs	$	114,246	$	8	$	2,127	$	112,127
Mortgage-backed and CMOs	106,163		293		1,140		105,316
State and municipal	92,711		1,262		347		93,626
Corporate	7,842		234		14		8,062
Equity securities	1,383		823		—		2,206
Total securities available for sale	$	322,345	$	2,620	$	3,628	$	321,337

	December 31, 2016
	Amortized Cost		Unrealized Gains		Unrealized Losses		Fair Value
Securities available for sale:
Federal agencies and GSEs	$	106,379	$	62	$	2,387	$	104,054
Mortgage-backed and CMOs	79,917		514		938		79,493
State and municipal	145,757		2,540		782		147,515
Corporate	13,392		123		23		13,492
Equity securities	1,288		660		—		1,948
Total securities available for sale	$	346,733	$	3,899	$	4,130	$	346,502

Amortized cost and estimated fair value of investments in securities by contractual maturity

The amortized cost and estimated fair value of investments in securities at December 31, 2017, by contractual maturity, are shown in the following table.  Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.  Because mortgage-backed securities have both known principal repayment terms as well as unknown principal repayments due to potential borrower pre-payments, it is difficult to accurately predict the final maturity of these investments.  Mortgage-backed securities are shown separately (dollars in thousands):

	Available for Sale
	Amortized Cost		Fair Value
Due in one year or less	$	11,540	$	11,549
Due after one year through five years	102,806		102,982
Due after five years through ten years	73,884		73,072
Due after ten years	26,569		26,212
Mortgage-backed and CMOs	106,163		105,316
Equity securities	1,383		2,206
	$	322,345	$	321,337

Gross realized gains and losses

Gross realized gains and losses from the sale of securities available for sale were as follows (dollars in thousands):

	For the Years Ended December 31,
	2017			2016			2015
Realized gains	$	825		$	844		$	871
Realized losses	(13		)	(8		)	(4		)
Other-than-temporary impairment	—			—			—

Schedule of available for sale securities, continuous unrealized loss position

The table below shows gross unrealized losses and fair value, aggregated by investment category and length of time that individual securities had been in a continuous unrealized loss position, at December 31, 2016 (dollars in thousands):

	Total				Less than 12 Months				12 Months or More
	Fair Value		Unrealized Loss		Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
Federal agencies and GSEs	$	89,597	$	2,387	$	89,597	$	2,387	$	—	$	—
Mortgage-backed and CMOs	57,762		938		56,076		911		1,686		27
State and municipal	47,221		782		47,221		782		—		—
Corporate	2,895		23		2,895		23		—		—
Total	$	197,475	$	4,130	$	195,789	$	4,103	$	1,686	$	27

Available for sale securities that have been in a continuous unrealized loss position are as follows (dollars in thousands):

	Total				Less than 12 Months				12 Months or More
	Fair Value		Unrealized Loss		Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
Federal agencies and GSEs	$	99,133	$	2,127	$	45,474	$	321	$	53,659	$	1,806
Mortgage-backed and CMOs	90,806		1,140		64,449		533		26,357		607
State and municipal	34,550		347		27,442		159		7,108		188
Corporate	1,529		14		495		5		1,034		9
Total	$	226,018	$	3,628	$	137,860	$	1,018	$	88,158	$	2,610