Investment Securities (Tables)

9 Months Ended

Sep. 30, 2016

Schedule of Held-to-maturity Securities [Line Items]

Analysis of Amortized Cost and Estimated Fair Value of Securities Available for Sale

Below is an analysis of the amortized cost and estimated fair values of securities available for sale at:

	September 30, 2016									December 31, 2015
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value		Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
	(dollars in thousands)
Obligations of U.S. Government Agencies:
Mortgage-Backed Securities – Residential	$	16,059	$	1,917	$	—		$	17,976	$	20,034	$	2,071	$	(13	)	$	22,092
Obligations of U.S. Government-Sponsored Enterprises:
Mortgage-Backed Securities – Residential	692,092		13,090		(556		)	704,626		778,476		7,983		(8,882		)	777,577
Mortgage-Backed Securities – Commercial	1		—		—			1		28		—		—			28
Other Government-Sponsored Enterprises	19,300		7		—			19,307		19,201		2		(85		)	19,118
Obligations of States and Political Subdivisions	27,073		878		—			27,951		27,066		532		—			27,598
Corporate Securities	5,901		618		—			6,519		1,897		422		—			2,319
Pooled Trust Preferred Collateralized Debt Obligations	43,020		677		(8,088		)	35,609		42,239		916		(7,497		)	35,658
Total Debt Securities	803,446		17,187		(8,644		)	811,989		888,941		11,926		(16,477		)	884,390
Equities	1,670		—		—			1,670		2,170		—		—			2,170
Total Securities Available for Sale	$	805,116	$	17,187	$	(8,644	)	$	813,659	$	891,111	$	11,926	$	(16,477	)	$	886,560

Amortized Cost and Estimated Fair Value of Debt Securities Available for Sale

The amortized cost and estimated fair value of debt securities available for sale at September 30, 2016, by contractual maturity, are shown below.

	Amortized Cost		Estimated Fair Value
	(dollars in thousands)
Due within 1 year	$	5,600	$	5,602
Due after 1 but within 5 years	17,697		17,756
Due after 5 but within 10 years	27,073		27,951
Due after 10 years	44,924		38,077
	95,294		89,386
Mortgage-Backed Securities (a)	708,152		722,603
Total Debt Securities	$	803,446	$	811,989

(a) Mortgage Backed Securities include an amortized cost of $16.1 million and a fair value of $18.0 million for Obligations of U.S.

Proceeds from Sale, Gross Gains (Losses) Realized on Sales, Maturities and Other-Than-Temporary Impairment Charges Related to Securities Available for Sale

Proceeds from sales, gross gains (losses) realized on sales, maturities and other-than-temporary impairment charges related to securities available for sale were as follows for the nine months endedSeptember 30:

	2016			2015
	(dollars in thousands)
Proceeds from sales	$	55,744		$	—
Gross gains (losses) realized:
Sales Transactions:
Gross gains	$	304		$	—
Gross losses	(276		)	—
	28			—
Maturities and impairment
Gross gains	—			125
Gross losses	—			—
Other-than-temporary impairment	—			—
	—			125
Net gains and impairment	$	28		$	125