Investments (Tables)

9 Months Ended

Sep. 30, 2017

Investments [Abstract]

Aggregate Carrying And Approximate Market Values Of Available-For-Sale Securities

The amortized cost and estimated fair values of the Company's securities are shown in the following table (in thousands):

	September 30, 2017								December 31, 2016
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value		Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Securities available-for-sale:
U.S. Treasuries and U.S.
government agencies	$	2	$	—	$	—	$	2	$	3	$	—	$	—	$	3
Obligations of states and
political subdivisions	95,907		1,835		574		97,168		83,248		594		1,474		82,368
Mortgage-backed securities:
U.S. government agencies	397,192		1,931		5,136		393,987		335,867		1,507		6,560		330,814
Private label	687		3		—		690		941		1		—		942
Trust preferred securities	4,761		183		—		4,944		6,052		1,164		554		6,662
Corporate securities	21,918		562		154		22,326		23,925		127		478		23,574
Total Debt Securities	520,467		4,514		5,864		519,117		450,036		3,393		9,066		444,363
Marketable equity  securities	2,136		2,881		—		5,017		2,136		2,095		—		4,231
Investment funds	1,525		—		26		1,499		1,525		—		36		1,489
Total Securities
Available-for-Sale	$	524,128	$	7,395	$	5,890	$	525,633	$	453,697	$	5,488	$	9,102	$	450,083

Aggregate Carrying And Approximate Market Values Of Held-To-Maturity Securities

	September 30, 2017								December 31, 2016
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value		Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Securities held-to-maturity:
Mortgage-backed securities:
U.S. government agencies	$	62,989	$	1,489	$	—	$	64,478	$	71,169	$	1,346	$	70	$	72,445
Trust preferred securities	4,000		—		—		4,000		4,000		—		—		4,000
Total Securities
Held-to-Maturity	$	66,989	$	1,489	$	—	$	68,478	$	75,169	$	1,346	$	70	$	76,445
Other investment securities:
Non-marketable equity securities	$	15,988	$	—	$	—	$	15,988	$	14,352	$	—	$	—	$	14,352
Total Other Investment
Securities	$	15,988	$	—	$	—	$	15,988	$	14,352	$	—	$	—	$	14,352

Gross Unrealized Losses And Fair Value Of Investments

The following table shows the gross unrealized losses and fair value of the Company’s investments aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position (in thousands):

	September 30, 2017
	Less Than Twelve Months				Twelve Months or Greater				Total
	Estimated Fair Value		Unrealized Loss		Estimated Fair Value		Unrealized Loss		Estimated Fair Value		Unrealized Loss
Securities available-for-sale:
Obligations of states and political subdivisions	$	8,291	$	146	$	11,859	$	428	$	20,150	$	574
Mortgage-backed securities:
U.S. Government agencies	160,312		3,214		57,814		1,922		218,126		5,136
Corporate securities	—		—		2,265		154		2,265		154
Investment funds	1,500		26		—		—		1,500		26
Total	$	170,103	$	3,386	$	71,938	$	2,504	$	242,041	$	5,890

	December 31, 2016
	Less Than Twelve Months				Twelve Months or Greater				Total
	Estimated Fair Value		Unrealized Loss		Estimated Fair Value		Unrealized Loss		Estimated Fair Value		Unrealized Loss
Securities available-for-sale:
Obligations of states and political subdivisions	$	35,108	$	1,474	$	—	$	—	$	35,108	$	1,474
Mortgage-backed securities:
U.S. Government agencies	225,530		6,099		8,527		461		234,057		6,560
Trust preferred securities	—		—		4,971		554		4,971		554
Corporate securities	14,306		478		—		—		14,306		478
Investment funds	1,500		36		—		—		1,500		36
Total	$	276,444	$	8,087	$	13,498	$	1,015	$	289,942	$	9,102

Amortized Cost And Estimated Fair Value Of Debt Securities By Contractual Maturity

The amortized cost and estimated fair value of debt securities at September 30, 2017, by contractual maturity, are shown in the following table (in thousands).  Expected maturities will differ from contractual maturities because the issuers of the securities may have the right to prepay obligations without prepayment penalties.  Mortgage-backed securities have been allocated to their respective maturity groupings based on their contractual maturity.

	Amortized Cost		Estimated Fair Value
Securities Available-for-Sale
Due in one year or less	$	2,939	$	2,951
Due after one year through five years	12,388		14,839
Due after five years through ten years	80,329		77,039
Due after ten years	424,811		424,288
Total	$	520,467	$	519,117
Securities Held-to-Maturity
Due in one year or less	$	—	$	—
Due after one year through five years	—		—
Due after five years through ten years	—		—
Due after ten years	66,989		68,478
Total	$	66,989	$	68,478

Gross Gains And Losses Realized

Gross gains and gross losses realized by the Company from investment security transactions are summarized in the table below (in thousands).

	Three months ended September 30,					Nine months ended September 30,
	2017		2016			2017		2016
Gross realized gains	$	—	$	2,722		$	4,276	$	3,978
Gross realized losses	—		(54		)	—		(465		)
Net investment security gains	$	—	$	2,668		$	4,276	$	3,513