Securities (Tables)

9 Months Ended

Sep. 30, 2019

Investments, Debt and Equity Securities [Abstract]

Summary of Investment Securities

The book values and approximate fair values of investment securities at September 30, 2019 and December 31, 2018 are summarized as follows:

($ in thousands)	September 30, 2019						December 31, 2018
	Amortized Cost		Fair Value	Unrealized			Amortized Cost	Fair Value	Unrealized
				Gains	(Losses)				Gains	(Losses)
Securities available for sale:
Government-sponsored enterprise securities	$	30,000	30,053	55	(2	)	82,995	82,662	63	(396	)
Mortgage-backed securities	634,176		640,488	7,794	(1,482	)	396,995	385,551	39	(11,483	)
Corporate bonds	33,721		34,683	1,052	(90	)	33,751	33,138	76	(689	)
Total available for sale	$	697,897	705,224	8,901	(1,574	)	513,741	501,351	178	(12,568	)
Securities held to maturity:
Mortgage-backed securities	$	43,968	43,801	—	(167	)	52,048	50,241	—	(1,807	)
State and local governments	30,297		30,664	369	(2	)	49,189	49,665	525	(49	)
Total held to maturity	$	74,265	74,465	369	(169	)	101,237	99,906	525	(1,856	)

Schedule of Unrealized Losses on Investment Securities

The following table presents information regarding securities with unrealized losses at September 30, 2019:

($ in thousands)	Securities in an Unrealized Loss Position for Less than 12 Months			Securities in an Unrealized Loss Position for More than 12 Months		Total
	Fair Value		Unrealized Losses	Fair Value	Unrealized Losses	Fair Value	Unrealized Losses
Government-sponsored enterprise securities	$	4,998	2	—	—	4,998	2
Mortgage-backed securities	123,726		625	118,579	1,024	242,305	1,649
Corporate bonds	—		—	910	90	910	90
State and local governments	—		—	940	2	940	2
Total temporarily impaired securities	$	128,724	627	120,429	1,116	249,153	1,743

The following table presents information regarding securities with unrealized losses at December 31, 2018:

($ in thousands)	Securities in an Unrealized Loss Position for Less than 12 Months			Securities in an Unrealized Loss Position for More than 12 Months		Total
	Fair Value		Unrealized Losses	Fair Value	Unrealized Losses	Fair Value	Unrealized Losses
Government-sponsored enterprise securities	$	4,921	78	13,682	318	18,603	396
Mortgage-backed securities	82,525		351	294,305	12,939	376,830	13,290
Corporate bonds	20,704		433	5,817	256	26,521	689
State and local governments	595		1	6,641	48	7,236	49
Total temporarily impaired securities	$	108,745	863	320,445	13,561	429,190	14,424

Schedule of Contractual Maturity of Investment Securities

The book values and approximate fair values of investment securities at September 30, 2019, by contractual maturity, are summarized in the table below. Expected maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations with or without call or prepayment penalties.

	Securities Available for Sale			Securities Held to Maturity
($ in thousands)	Amortized Cost		Fair Value	Amortized Cost	Fair Value
Securities
Due within one year	$	—	—	1,165	1,168
Due after one year but within five years	58,721		59,661	21,645	21,925
Due after five years but within ten years	—		—	6,673	6,718
Due after ten years	5,000		5,075	814	853
Mortgage-backed securities	634,176		640,488	43,968	43,801
Total securities	$	697,897	705,224	74,265	74,465