Investment Securities (Tables)

12 Months Ended

Dec. 31, 2014

Investments, Debt and Equity Securities [Abstract]

Amortized Cost and Approximate Fair Values of Securities

The amortized cost, gross unrealized gains, gross unrealized losses and approximate market value of the Corporation's investment securities at the dates indicated were:



	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Available for sale at December 31, 2014
U.S. Government-sponsored agency securities	$	100	$	9			$	109
State and municipal	216,915		11,801		$	123	228,593
U.S. Government-sponsored mortgage-backed securities	310,460		8,771		127		319,104
Corporate obligations	31						31
Equity securities	1,706						1,706
Total available for sale	529,212		20,581		250		549,543
Held to maturity at December 31, 2014
State and municipal	204,443		5,716		96		210,063
U.S. Government-sponsored mortgage-backed securities	426,645		11,527		512		437,660
Total held to maturity	631,088		17,243		608		647,723
Total Investment Securities	$	1,160,300	$	37,824	$	858	$	1,197,266

Available for sale at December 31, 2013
U.S. Treasury	$	15,914	$	80	$	21	$	15,973
U.S. Government-sponsored agency securities	3,550		12		17		3,545
State and municipal	231,005		3,878		3,896		230,987
U.S. Government-sponsored mortgage-backed securities	279,299		3,926		1,973		281,252
Corporate obligations	6,374				3,636		2,738
Equity securities	1,706						1,706
Total available for sale	537,848		7,896		9,543		536,201
Held to maturity at December 31, 2013
State and municipal	145,941		62		91		145,912
U.S. Government-sponsored mortgage-backed securities	413,437		5,220		3,722		414,935
Total held to maturity	559,378		5,282		3,813		560,847
Total Investment Securities	$	1,097,226	$	13,178	$	13,356	$	1,097,048

Debt Securities Credit Loss Recognized in Income, and Other Losses Recorded in Other Comprehensive Income

The following table provides information about debt securities for which only a credit loss was recognized in income and other losses were recorded in other comprehensive income.



	Accumulated Credit Losses in			Accumulated Credit Losses in
	2014			2013
Credit losses on debt securities held:
Balance, January 1	$	11,355		$	11,355
Reductions for previous other-than-temporary losses realized on securities sold during the year	(10,855		)
Balance, December 31	$	500		$	11,355

Investments' Gross Unrealized Losses and Fair Value Aggregated by Investment Category and Length of Time in Continuous Unrealized Loss Position

The following table shows the Corporation’s gross unrealized losses and fair value, aggregated by investment category and length of time the individual securities have been in a continuous unrealized loss position at December 31, 2014 and 2013:



	Less than 12 Months				12 Months or Longer				Total
	Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses
Temporarily Impaired Available for Sale Securities at December 31, 2014
State and municipal	$	1,256	$	7	$	9,850	$	116	$	11,106	$	123
U.S. Government-sponsored mortgage-backed securities	2,186		13		5,447		114		7,633		127
Total Temporarily Impaired Available for Sale Securities	3,442		20		15,297		230		18,739		250
Temporarily Impaired Held to Maturity Securities at December 31, 2014
State and municipal	5,119		96		250				5,369		96
U.S. Government-sponsored mortgage-backed securities	9,791		82		38,491		430		48,282		512
Total Temporarily Impaired Held to Maturity Securities	14,910		178		38,741		430		53,651		608
Total Temporarily Impaired Investment Securities	$	18,352	$	198	$	54,038	$	660	$	72,390	$	858


	Less than 12 Months				12 Months or Longer				Total
	Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses
Temporarily Impaired Available for Sale Securities at December 31, 2013
U.S. Treasury	$	4,875	$	21					$	4,875	$	21
U.S. Government-sponsored agency securities	3,433		17						3,433		17
State and municipal	111,791		3,840		$	583	$	56	112,374		3,896
U.S. Government-sponsored mortgage-backed securities	117,866		1,701		2,683		272		120,549		1,973
Corporate obligations					2,711		3,636		2,711		3,636
Total Temporarily Impaired Available for Sale Securities	237,965		5,579		5,977		3,964		243,942		9,543
Temporarily Impaired Held to Maturity Securities at December 31, 2013
State and municipal	17,318		91		184				17,502		91
U.S. Government-sponsored mortgage-backed securities	213,048		3,462		2,640		260		215,688		3,722
Total Temporarily Impaired Held to Maturity Securities	230,366		3,553		2,824		260		233,190		3,813
Total Temporarily Impaired Investment Securities	$	468,331	$	9,132	$	8,801	$	4,224	$	477,132	$	13,356

Amortized Cost and Fair Value of Available for Sale Securities and Held to Maturity Securities by Contractual Maturity

Expected maturities will differ from contractual maturities because issuers may have the right to call or prepay obligations with or without call or prepayment penalties.



	Available for Sale				Held to Maturity
	Amortized Cost		Fair Value		Amortized Cost		Fair Value
Maturity Distribution at December 31, 2014
Due in one year or less	$	3,127	$	3,153	$	6,258	$	6,329
Due after one through five years	9,565		9,840		18,440		18,930
Due after five through ten years	48,675		50,889		85,997		87,903
Due after ten years	155,679		164,851		93,748		96,901
	217,046		228,733		204,443		210,063
U.S. Government-sponsored mortgage-backed securities	310,460		319,104		426,645		437,660
Equity securities	1,706		1,706
Total Investment Securities	$	529,212	$	549,543	$	631,088	$	647,723

- Definition

Tabular disclosure of the amount of other than temporary impairment (OTTI) related to credit losses recognized in earnings including: (a) the beginning balance of the amount related to credit losses on debt securities held by the investor at the beginning of the period for which a portion of an OTTI was recognized in other comprehensive income; (b) additions for the amount related to the credit loss for which an OTTI was not previously recognized; (c) reductions for securities sold during the period (realized); (d) reductions for securities for which the amount previously recognized in other comprehensive income was recognized in earnings because the investor intends to sell the security or more likely than not will be required to sell the security before recovery of its amortized cost basis; (e) additional increases to the amount related to the credit loss for which an OTTI was previously recognized when the investor does not intend to sell the security and it is not more likely than not that the investor will be required to sell the security before recovery of its amortized cost basis; (f) reductions for increases in cash flows expected to be collected that are recognized over the remaining life of the security; and (g) the ending balance of the amount related to credit losses on debt securities held by the entity at the end of the period for which a portion of an OTTI was recognized in other comprehensive income.

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