Investments (Tables)

6 Months Ended

Jun. 30, 2018

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):

	June 30, 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	$	1	$	—	$	—	$	1	$	2	$	—	$	—	$	2
Obligations of states and
political subdivisions	93,596		600		1,156		93,040		94,552		2,051		407		96,196
Mortgage-backed securities:
U.S. government agencies	453,109		407		17,732		435,784		425,559		1,093		7,305		419,347
Private label	558		5		—		563		649		3		—		652
Trust preferred securities	4,769		28		—		4,797		4,764		26		54		4,736
Corporate securities(1)	17,095		23		155		16,963		21,916		475		123		22,268
Total Debt Securities	569,128		1,063		19,043		551,148		547,442		3,648		7,889		543,201
Marketable equity  securities	—		—		—		—		2,136		3,563		—		5,699
Investment funds	1,525		—		70		1,455		1,525		—		36		1,489
Total Securities
Available-for-Sale	$	570,653	$	1,063	$	19,113	$	552,603	$	551,103	$	7,211	$	7,925	$	550,389

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

Securities held-to-maturity:
Mortgage-backed securities:
U.S. government agencies	$	56,030	$	—	$	402	$	55,628	$	60,449	$	1,222	$	25	$	61,646
Trust preferred securities	4,000		—		—		4,000		4,000		—		—		4,000
Total Securities
Held-to-Maturity	$	60,030	$	—	$	402	$	59,628	$	64,449	$	1,222	$	25	$	65,646

Aggregate Carrying And Approximate Market Values of Marketable and Non-Marketable Securities

Other investment securities:
Non-marketable equity securities	$	17,745	$	—	$	—	$	17,745	$	14,147	$	—	$	—	$	14,147
Marketable equity securities(1)	11,175		—		—		11,175		—		—		—		—
Total Other Investment
Securities	$	28,920	$	—	$	—	$	28,920	$	14,147	$	—	$	—	$	14,147
(1) Effective January 1, 2018, the Company's equity and perpetual preferred securities are measured at fair value through net income.

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):

	June 30, 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	$	29,391	$	347	$	18,880	$	809	$	48,271	$	1,156
Mortgage-backed securities:
U.S. Government agencies	252,029		7,667		154,105		10,065		406,134		17,732
Corporate securities	14,947		155		—		—		14,947		155
Investment funds	1,500		70		—		—		1,500		70
Total available-for-sale	$	297,867	$	8,239	$	172,985	$	10,874	$	470,852	$	19,113
Securities held-to-maturity:
Mortgage-backed securities
U.S. Government agencies	$	50,941	$	402	$	—	$	—	$	50,941	$	402
Total held-to-maturity	$	50,941	$	402	$	—	$	—	$	50,941	$	402

	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 June 30, 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.

	Amortized Cost		Estimated Fair Value
Available-for-Sale Debt Securities
Due in one year or less	$	2,861	$	2,863
Due after one year through five years	10,933		10,954
Due after five years through ten years	76,575		73,198
Due after ten years	478,759		464,133
Total	$	569,128	$	551,148
Held-to-Maturity Debt Securities
Due in one year or less	$	—	$	—
Due after one year through five years	—		—
Due after five years through ten years	—		—
Due after ten years	60,030		59,628
Total	$	60,030	$	59,628

Gross Gains And Losses Realized

. Additionally, on January 1, 2018, the Company reclassified $2.7 million, net of deferred taxes, from other comprehensive income to retained earnings on the consolidated balance sheets to recognize the prior period fair value impact of these securities.

	Three months ended June 30,				Six months ended June 30,
	2018		2017		2018		2017
Equity and perpetual preferred securities:
Unrealized gains recognized on securities still held	$	592	$	—	$	772	$	—
Gross realized gains on securities sold	$	—	$	—	—		4,276
Gross realized losses on securities sold	—		—		—		—
Net investment security gains	$	—	$	—	$	—	$	4,276