Investment Securities (Tables)

12 Months Ended

Dec. 31, 2016

Investments, Debt and Equity Securities [Abstract]

Schedule of amortized cost and estimated fair value of securities

The amortized cost and estimated fair value of securities were as follows:

	December 31, 2016
	Amortized Cost		Unrealized Gain		Unrealized Loss			Estimated Fair Value
	(dollars in thousands)
Available-for-sale:
Corporate	$	37,475	$	372	$	(205	)	$	37,642
Municipal bonds	120,155		338		(1,690		)	118,803
Collateralized mortgage obligation: residential	31,536		25		(173		)	31,388
Mortgage-backed securities: residential	196,496		69		(3,435		)	193,130
Total available-for-sale	385,662		804		(5,503		)	380,963
Held-to-maturity:
Mortgage-backed securities: residential	7,375		—		(104		)	7,271
Other	1,190		—		—			1,190
Total held-to-maturity	8,565		—		(104		)	8,461
Total securities	$	394,227	$	804	$	(5,607	)	$	389,424
	December 31, 2015
	Amortized		Unrealized		Unrealized			Estimated
	Cost		Gain		Loss			Fair Value
	(dollars in thousands)
Available-for-sale:
Municipal bonds	$	128,546	$	1,796	$	(97	)	$	130,245
Collateralized mortgage obligation: residential	24,722		4		(183		)	24,543
Mortgage-backed securities: residential	126,443		153		(1,111		)	125,485
Total available-for-sale	279,711		1,953		(1,391		)	280,273
Held-to-maturity:
Mortgage-backed securities: residential	8,400		—		(70		)	8,330
Other	1,242		—		—			1,242
Total held-to-maturity	9,642		—		(70		)	9,572
Total securities	$	289,353	$	1,953	$	(1,461	)	$	289,845

Schedule of number, fair value and gross unrealized holding losses of the Company's investment securities by investment category and length of time that the securities have been in a continuous loss position

The table below shows the number, fair value and gross unrealized holding losses of the Company’s investment securities by investment category and length of time that the securities have been in a continuous loss position.

	December 31, 2016
	Less than 12 months						12 months or Longer						Total
	Number	Fair Value		Gross Unrealized Holding Losses			Number	Fair Value		Gross Unrealized Holding Losses			Number	Fair Value		Gross Unrealized Holding Losses
	(dollars in thousands)
Available-for-sale:
Corporate	3	$	7,609	$	(205	)	—	$	—	$	—		3	$	7,609	$	(205	)
Municipal bonds	152	85,750		(1,690		)	—	—		—			152	85,750		(1,690		)
Collateralized mortgage obligation: residential	5	19,092		(173		)	—	—		—			5	19,092		(173		)
Mortgage-backed securities: residential	55	149,740		(2,916		)	4	16,039		(519		)	59	165,779		(3,435		)
Total available-for-sale	215	262,191		(4,984		)	4	16,039		(519		)	219	278,230		(5,503		)
Held-to-maturity:
Mortgage-backed securities: residential	1	7,271		(104		)	—	—		$	—		1	7,271		(104		)
Total held-to-maturity	1	7,271		(104		)	—	—		$	—		1	7,271		(104		)
Total securities	216	$	269,462	$	(5,088	)	4	$	16,039	$	(519	)	220	$	285,501	$	(5,607	)
	December 31, 2015
	Less than 12 months						12 months or Longer						Total
	Number	Fair Value		Gross Unrealized Holding Losses			Number	Fair Value		Gross Unrealized Holding Losses			Number	Fair Value		Gross Unrealized Holding Losses
	(dollars in thousands)
Available-for-sale:
Municipal bonds	32	$	15,516	$	(61	)	6	$	3,349	$	(36	)	38	$	18,865	$	(97	)
Collateralized mortgage obligation: residential	5	22,771		(183		)	—	—		—			5	22,771		(183		)
Mortgage-backed securities: residential	34	83,488		(679		)	3	12,935		(432		)	37	96,423		(1,111		)
Total available-for-sale	71	$	121,775	(923		)	9	16,284		(468		)	80	138,059		(1,391		)
Held-to-maturity:
Mortgage-backed securities: residential	1	8,330		(70		)	—	—		—			1	8,330		(70		)
Total held-to-maturity	1	8,330		(70		)	—	—		—			1	8,330		(70		)
Total securities	72	$	130,105	$	(993	)	9	$	16,284	$	(468	)	81	$	146,389	$	(1,461	)

Schedule of amortized cost and estimated fair value of investment securities available for sale by contractual maturity

The amortized cost and estimated fair value of investment securities available for sale at December 31, 2016, by contractual maturity are shown in the table below.

	One Year or Less				More than One Year to Five Years				More than Five Years to Ten Years				More than Ten Years				Total
	Amortized Cost		Fair Value		Amortized Cost		Fair Value		Amortized Cost		Fair Value		Amortized Cost		Fair Value		Amortized Cost		Fair Value
	(dollars in thousands)
Available-for-sale:
Corporate	$	—	$	—	$	—	$	—	$	37,475	$	37,642	$	—	$	—	$	37,475	$	37,642
Municipal bonds	1,236		1,236		28,450		28,361		43,307		42,715		47,162		46,491		120,155		118,803
Collateralized mortgage obligation: residential	—		—		—		—		1,392		1,395		30,144		29,993		31,536		31,388
Mortgage-backed securities: residential	—		—		1,166		1,160		22,813		22,627		172,517		169,343		196,496		193,130
Total available-for-sale	1,236		1,236		29,616		29,521		104,987		104,379		249,823		245,827		385,662		380,963
Held-to-maturity:
Mortgage-backed securities: residential	—		—		—		—		—		—		7,375		7,271		7,375		7,271
Other	—		—		—		—		—		—		1,190		1,190		1,190		1,190
Total held-to-maturity	—		—		—		—		—		—		8,565		8,461		8,565		8,461
Total securities	$	1,236	$	1,236	$	29,616	$	29,521	$	104,987	$	104,379	$	258,388	$	254,288	$	394,227	$	389,424