Investments (Tables)

3 Months Ended

Mar. 31, 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):

	March 31, 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	$	3	$	—	$	—	$	3	$	3	$	—	$	—	$	3
Obligations of states and
political subdivisions	95,440		983		1,223		95,200		83,248		594		1,474		82,368
Mortgage-backed securities:
U.S. government agencies	343,681		1,548		6,075		339,154		335,867		1,507		6,560		330,814
Private label	877		2		—		879		941		1		—		942
Trust preferred securities	4,755		133		201		4,687		6,052		1,164		554		6,662
Corporate securities	23,923		361		196		24,088		23,925		127		478		23,574
Total Debt Securities	468,679		3,027		7,695		464,011		450,036		3,393		9,066		444,363
Marketable equity  securities	2,136		2,462		—		4,598		2,136		2,095		—		4,231
Investment funds	1,525		—		36		1,489		1,525		—		36		1,489
Total Securities
Available-for-Sale	$	472,340	$	5,489	$	7,731	$	470,098	$	453,697	$	5,488	$	9,102	$	450,083

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

	March 31, 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	$	68,308	$	1,392	$	44	$	69,656	$	71,169	$	1,346	$	70	$	72,445
Trust preferred securities	4,000		—		—		4,000		4,000		—		—		4,000
Total Securities
Held-to-Maturity	$	72,308	$	1,392	$	44	$	73,656	$	75,169	$	1,346	$	70	$	76,445
Other investment securities:
Non-marketable equity securities	$	10,240	$	—	$	—	$	10,240	$	14,352	$	—	$	—	$	14,352
Total Other Investment
Securities	$	10,240	$	—	$	—	$	10,240	$	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):

	March 31, 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	$	41,257	$	1,223	$	—	$	—	$	41,257	$	1,223
Mortgage-backed securities:
U.S. Government agencies	216,707		5,611		8,136		464		224,843		6,075
Trust preferred securities	—		—		4,319		201		4,319		201
Corporate securities	2,328		51		2,265		145		4,593		196
Investment funds	1,500		36		—		—		1,500		36
Total	$	261,792	$	6,921	$	14,720	$	810	$	276,512	$	7,731

	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 March 31, 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	$	2,770	$	2,788
Due after one year through five years	15,041		15,225
Due after five years through ten years	81,726		80,029
Due after ten years	369,142		365,969
	$	468,679	$	464,011
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	72,308		73,656
	$	72,308	$	73,656

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 March 31, 2017
	2017		2016
Gross realized gains	$	4,276	$	—
Gross realized losses	—		—
Net investment security gains	$	4,276	$	—