Investments (Tables)

12 Months Ended

Dec. 31, 2016

Investments [Abstract]

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

	December 31, 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
Securities available-for-sale:
U.S. Treasuries and U.S.
government agencies	$	3	$	—	$	—	$	3	$	5	$	—	$	—	$	5
Obligations of states and
political subdivisions	83,248		594		1,474		82,368		49,725		979		7		50,697
Mortgage-backed securities:
U.S. government agencies	335,867		1,507		6,560		330,814		287,933		2,285		2,021		288,197
Private label	941		1		—		942		1,222		9		—		1,231
Trust preferred
securities	6,052		1,164		554		6,662		6,550		463		1,155		5,858
Corporate securities	23,925		127		478		23,574		18,793		221		321		18,693
Total Debt Securities	450,036		3,393		9,066		444,363		364,228		3,957		3,504		364,681
Marketable equity  securities	2,136		2,095		—		4,231		2,131		1,142		—		3,273
Investment funds	1,525		—		36		1,489		1,525		—		13		1,512
Total Securities
Available-for-Sale	$	453,697	$	5,488	$	9,102	$	450,083	$	367,884	$	5,099	$	3,517	$	369,466

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

	December 31, 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
Securities held-to-maturity
U.S. government agencies	$	71,169	$	1,346	$	70	$	72,445	$	84,937	$	1,949	$	76	$	86,810
Trust preferred securities	4,000		—		—		4,000		4,000		—		—		4,000
Total Securities
Held-to-Maturity	$	75,169	$	1,346	$	70	$	76,445	$	88,937	$	1,949	$	76	$	90,810
Other investment securities:
Non-marketable equity securities	$	14,352	$	—	$	—	$	14,352	$	12,915	$	—	$	—	$	12,915
Total Other Investment
Securities	$	14,352	$	—	$	—	$	14,352	$	12,915	$	—	$	—	$	12,915

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):

	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

	December 31, 2015
	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	$	2,406	$	5	$	128	$	2	$	2,534	$	7
Mortgage-backed securities:
U.S. Government agencies	129,612		688		34,044		1,333		163,656		2,021
Trust preferred securities	—		—		4,769		1,155		4,769		1,155
Corporate securities	10,856		174		2,231		147		13,087		321
Investment funds	—		—		1,488		13		1,488		13
Total	$	142,874	$	867	$	42,660	$	2,650	$	185,534	$	3,517

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

The amortized cost and estimated fair value of debt securities at December 31, 2016, 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.

	Cost		Estimated Fair Value
Securities Available-for-Sale
Due in one year or less	$	2,287	$	2,211
Due after one year through five years	25,632		17,632
Due after five years through ten years	64,842		71,162
Due after ten years	357,275		353,358
	$	450,036	$	444,363
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	75,169		76,445
	$	75,169	$	76,445

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):

	For the year ended December 31,
	2016			2015			2014
Gross realized gains	$	3,978		$	2,142		$	1,256
Gross realized losses	(465		)	(12		)	(100		)
Investment security gains (losses)	$	3,513		$	2,130		$	1,156