Investment Securities (Tables)

9 Months Ended

Sep. 30, 2018

Investments, Debt and Equity Securities [Abstract]

Schedule of Available-for-Sale Investment Securities

The amortized cost and estimated fair value of available-for-sale investment securities are as follows (dollars in thousands):

	Amortized Cost		Unrealized Gains		Unrealized Losses		Fair Value
September 30, 2018
Available for sale:
State, county, and municipal securities	$	23,775	$	27	$	1,043	$	22,759
Mortgage-backed securities	313,605		468		10,028		304,045
Corporate debt securities	25,566		328		92		25,802
	$	362,946	$	823	$	11,163	$	352,606
December 31, 2017
State, county, and municipal securities	$	23,042	$	209	$	442	$	22,809
Mortgage-backed securities	263,467		915		4,863		259,519
Mutual funds	2,100		—		39		2,061
Corporate debt securities	23,975		837		10		24,802
	$	312,584	$	1,961	$	5,354	$	309,191

Schedule of Held-to-Maturity Securities

The amortized cost and estimated fair value of held-to-maturity investment securities are as follows (dollars in thousands):

	Amortized Cost		Unrealized Gains		Unrealized Losses		Fair Value
September 30, 2018
Held-to-maturity:
State, county, and municipal securities	$	27,148	$	83	$	149	$	27,082
Mortgage-backed securities	37,745		—		1,246		36,499
	$	64,893	$	83	$	1,395	$	63,581
December 31, 2017
State, county, and municipal securities	$	35,908	$	265	$	22	$	36,151
Mortgage-backed securities	45,144		171		546		$	44,769
	$	81,052	$	436	$	568	$	80,920

Summary of Amortized Cost and Fair Value of Debt Securities by Contractual Maturity

The amortized cost and estimated fair value of debt securities by contractual maturity are summarized in the tables below (dollars in thousands):   Actual maturities will differ from contractual maturities because of rights to call or repay obligations with or without penalties and scheduled and unscheduled principal payments on mortgage-backed securities and collateralized mortgage obligations.

	Amortized Cost		Fair Value
September 30, 2018
Available for sale:
Due in one year or less	$	—	$	—
Due after one year through five years	8,140		8,150
Due after five years through ten years	22,640		22,805
Due after ten years	270,755		261,169
Mortgage-backed securities	61,411		60,482
	$	362,946	$	352,606
Held-to-maturity:
Due in one year or less	$	768	$	767
Due after one year through five years	4,821		4,763
Due after five years through ten years	13,347		13,316
Due after ten years	15,963		15,563
Mortgage-backed securities	29,994		29,172
	$	64,893	$	63,581

Schedule of Investment Securities with Unrealized Losses

The following tables detail the gross unrealized losses and estimated fair value of available for sale and held-to-maturity securities aggregated by category and duration of continuous unrealized loss position at September 30, 2018 and December 31, 2017 (dollars in thousands):

	Less than 12 Months				12 Months or More				Total
	Fair Value		Unrealized  Loss		Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
September 30, 2018
Available for sale:
State, county, and municipal securities	$	5,948	$	44	$	12,714	$	999	$	18,662	$	1,043
Mortgage-backed securities	96,704		1,193		179,082		8,835		275,786		10,028
Corporate debt securities	2,908		92		—		—		2,908		92
	$	105,560	$	1,329	$	191,796	$	9,834	$	297,356	$	11,163
December 31, 2017
State, county, and municipal securities	$	596	$	5	$	12,716	$	437	$	13,312	$	442
Mortgage-backed securities	87,390		772		145,696		4,091		233,086		4,863
Mutual funds	2,061		39		—		—		2,061		39
Corporate debt securities	2,990		10		—		—		2,990		10
	$	93,037	$	826	$	158,412	$	4,528	$	251,449	$	5,354

	Less than 12 Months				12 Months or More				Total
	Fair Value		Unrealized Loss		Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
September 30, 2018
Held-to-maturity:
State, county, and municipal securities	$	12,645	$	149	$	—	$	—	$	12,645	$	149
Mortgage-backed securities	15,922		226		20,578		1,020		36,500		1,246
	$	28,567	$	375	$	20,578	$	1,020	$	49,145	$	1,395
December 31, 2017
State, county, and municipal securities	$	6,340	$	22	$	—	$	—	$	6,340	$	22
Mortgage-backed securities	13,138		95		12,090		451		25,228		546
	$	19,478	$	117	$	12,090	$	451	$	31,568	$	568