Investment Securities (Tables)

3 Months Ended

Mar. 31, 2017

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:

	March 31, 2017
	Amortized  Cost		Unrealized Gain		Unrealized Loss			Estimated Fair Value
	(dollars in thousands)
Investment securities available-for-sale:
Corporate	$	53,523	$	838	$	(173	)	$	54,188
Municipal bonds	129,366		605		(1,189		)	128,782
Collateralized mortgage obligation: residential	30,145		45		(187		)	30,003
Mortgage-backed securities: residential	225,346		126		(3,037		)	222,435
Total investment securities available-for-sale	438,380		1,614		(4,586		)	435,408
Investment securities held-to-maturity:
Mortgage-backed securities: residential	7,095		—		(125		)	6,970
Other	1,177		—		—			1,177
Total investment securities held-to-maturity	8,272		—		(125		)	8,147
Total investment securities	$	446,652	$	1,614	$	(4,711	)	$	443,555

	December 31, 2016
	Amortized Cost		Unrealized Gain		Unrealized Loss			Estimated Fair Value
	(dollars in thousands)
Investment securities 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 investment securities available-for-sale	385,662		804		(5,503		)	380,963
Investment securities held-to-maturity:
Mortgage-backed securities: residential	7,375		—		(104		)	7,271
Other	1,190		—		—			1,190
Total investment securities held-to-maturity	8,565		—		(104		)	8,461
Total investment securities	$	394,227	$	804	$	(5,607	)	$	389,424

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.

	March 31, 2017
	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)
Investment securities available-for-sale:
Corporate	3	$	7,629	$	(173	)	—	$	—	$	—		3	$	7,629	$	(173	)
Municipal bonds	90	53,419		(1,189		)	—	—		—			90	53,419		(1,189		)
Collateralized mortgage obligation: residential	5	17,032		(187		)	—	—		—			5	17,032		(187		)
Mortgage-backed securities: residential	57	168,484		(2,648		)	6	20,105		(389		)	63	188,589		(3,037		)
Total investment securities available-for-sale	155	246,564		(4,197		)	6	20,105		(389		)	161	266,669		(4,586		)
Investment securities held-to-maturity:
Mortgage-backed securities: residential	1	6,970		(125		)	—	—		—			1	6,970		(125		)
Total investment securities held-to-maturity	1	6,970		(125		)	—	—		—			1	6,970		(125		)
Total investment securities	156	$	253,534	$	(4,322	)	6	$	20,105	$	(389	)	162	$	273,639	$	(4,711	)

	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)
Investment securities 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 investment securities available-for-sale	215	262,191		(4,984		)	4	16,039		(519		)	219	278,230		(5,503		)
Investment securities held-to-maturity:
Mortgage-backed securities: residential	1	7,271		(104		)	—	—		—			1	7,271		(104		)
Total investment securities held-to-maturity	1	7,271		(104		)	—	—		—			1	7,271		(104		)
Total investment securities	216	$	269,462	$	(5,088	)	4	$	16,039	$	(519	)	220	$	285,501	$	(5,607	)

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 at March 31, 2017, 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)
Investment securities available-for-sale:
Corporate	$	—	$	—	$	—	$	—	$	45,523	$	46,188	$	8,000	$	8,000	$	53,523	$	54,188
Municipal bonds	1,841		1,841		26,585		26,672		48,823		48,411		52,117		51,858		129,366		128,782
Collateralized mortgage obligation: residential	—		—		—		—		1,308		1,310		28,837		28,693		30,145		30,003
Mortgage-backed securities: residential	—		—		2,400		2,385		32,117		31,998		190,829		188,052		225,346		222,435
Total investment securities available-for-sale	1,841		1,841		28,985		29,057		127,771		127,907		279,783		276,603		438,380		435,408
Investment securities held-to-maturity:
Mortgage-backed securities: residential	—		—		—		—		—		—		7,095		6,970		7,095		6,970
Other	—		—		—		—		—		—		1,177		1,177		1,177		1,177
Total investment securities held-to-maturity	—		—		—		—		—		—		8,272		8,147		8,272		8,147
Total investment securities	$	1,841	$	1,841	$	28,985	$	29,057	$	127,771	$	127,907	$	288,055	$	284,750	$	446,652	$	443,555