Investments (Tables)

12 Months Ended

Dec. 31, 2018

Investments [Abstract]

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

	December 31, 2018								December 31, 2017
	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	$	5,713	$	20	$	—	$	5,733	$	2	$	—	$	—	$	2
Obligations of states and
political subdivisions	128,089		1,033		1,052		128,070		94,552		2,051		407		96,196
Mortgage-backed securities:
U.S. government agencies	561,799		1,950		12,991		550,758		425,559		1,093		7,305		419,347
Private label	11,948		95		—		12,043		649		3		—		652
Trust preferred securities	4,774		25		—		4,799		4,764		26		54		4,736
Corporate securities	16,795		30		167		16,658		21,916		475		123		22,268
Total Debt Securities	729,118		3,153		14,210		718,061		547,442		3,648		7,889		543,201
Marketable equity  securities	—		—		—		—		2,136		3,563		—		5,699
Certificates of deposit held for investment	3,735		—		—		3,735		—		—		—		—
Investment funds	1,525		—		67		1,458		1,525		—		36		1,489
Total Securities
Available-for-Sale	$	734,378	$	3,153	$	14,277	$	723,254	$	551,103	$	7,211	$	7,925	$	550,389

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

Securities held-to-maturity:
U.S. government agencies	$	56,827	$	173	$	294	$	56,706	$	60,449	$	1,222	$	25	$	61,646
Trust preferred securities	4,000		—		—		4,000		4,000		—		—		4,000
Total Securities
Held-to-Maturity	$	60,827	$	173	$	294	$	60,706	$	64,449	$	1,222	$	25	$	65,646
Other investment securities:
Marketable equity  securities	$	10,313	$	—	$	—	$	10,313	$	—	$	—	$	—	$	—
Non-marketable equity securities	$	18,497	$	—	$	—	$	18,497	$	14,147	$	—	$	—	$	14,147
Total Other Investment
Securities	$	28,810	$	—	$	—	$	28,810	$	14,147	$	—	$	—	$	14,147

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, 2018
	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	$	11,837	$	272	$	22,068	$	780	$	33,905	$	1,052
Mortgage-backed securities:
U.S. Government agencies	84,975		1,593		282,560		11,398		367,535		12,991
Corporate securities	12,995		167		—		—		12,995		167
Investment funds	1,500		67		—		—		1,500		67
Total available-for-sale	$	111,307	$	2,099	$	304,628	$	12,178	$	415,935	$	14,277
Securities held-to-maturity:
Mortgage-backed securities:
U.S. Government agencies	$	28,274	$	126	$	5,960	$	168	$	34,234	$	294
Total held-to-maturity	$	28,274	$	126	$	5,960	$	168	$	34,234	$	294

	December 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	$	4,913	$	28	$	19,440	$	379	$	24,353	$	407
Mortgage-backed securities:
U.S. Government agencies	172,807		1,887		140,226		5,418		313,033		7,305
Trust preferred securities	4,475		54		—		—		4,475		54
Corporate securities	3,357		49		2,350		74		5,707		123
Investment funds	1,500		36		—		—		1,500		36
Total available-for-sale	$	187,052	$	2,054	$	162,016	$	5,871	$	349,068	$	7,925
Securities held-to-maturity:
Mortgage-backed securities:
U.S. Government agencies	$	7,182	$	25	$	—	$	—	$	7,182	$	25
Total held-to-maturity	$	7,182	$	25	$	—	$	—	$	7,182	$	25

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, 2018, 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	$	5,592	$	5,572
Due after one year through five years	24,793		24,879
Due after five years through ten years	132,761		130,569
Due after ten years	565,972		557,041
	$	729,118	$	718,061
Securities Held-to-Maturity
Due in one year or less	$	—	$	—
Due after one year through five years	—		—
Due after five years through ten years	4,927		5,053
Due after ten years	55,900		55,653
	$	60,827	$	60,706

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,
	2018			2017		2016
Gross unrealized gains recognized on securities still held	$	208		—		—
Gross unrealized losses recognized on securities still held	(298		)	—		—
Net unrealized (losses) gains recognized on securities still held	$	(90	)	$	—	$	—
Gross realized gains	—			$	4,476	$	3,978
Gross realized losses	—			—		(465		)
Net realized investment security gains	$	—		$	4,476	$	3,513