Investment Securities (Tables)

12 Months Ended

Dec. 31, 2012

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 investment securities at the dates indicated were:



	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Available for sale at December 31, 2012
U.S. Government-sponsored agency securities	$	4,475	$	165			$	4,640
State and municipal	148,187		10,025		$	18	158,194
U.S. Government-sponsored mortgage-backed securities	337,631		10,994		46		348,579
Corporate obligations	6,105				5,881		224
Equity securities	1,706						1,706
Total available for sale	498,104		21,184		5,945		513,343
Held to maturity at December 31, 2012
State and municipal	117,227		5,489		1		122,715
U.S. Government-sponsored mortgage-backed securities	243,793		11,681		15		255,459
Total held to maturity	361,020		17,170		16		378,174
Total Investment Securities	$	859,124	$	38,354	$	5,961	$	891,517

Available for sale at December 31, 2011
U.S. Government-sponsored agency securities	$	99	$	18			$	117
State and municipal	136,857		10,496				147,353
U.S. Government-sponsored mortgage-backed securities	358,928		10,086		$	16	368,998
Corporate obligations	5,765				5,572		193
Equity securities	1,830						1,830
Total available for sale	503,479		20,600		5,588		518,491
Held to maturity at December 31, 2011
State and municipal	120,171		3,785				123,956
U.S. Government-sponsored mortgage-backed securities	307,738		10,775				318,513
Total held to maturity	427,909		14,560				442,469
Total Investment Securities	$	931,388	$	35,160	$	5,588	$	960,960

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 are recorded in other comprehensive income.



	Accumulated Credit Losses in		Accumulated Credit Losses in
	2012		2011
Credit losses on debt securities held:
Balance, January 1	$	11,355	$	10,955
Additions related to other-than-temporary losses not previously recognized			400
Balance, December 31	$	11,355	$	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 that individual securities have been in a continuous unrealized loss position at December 31, 2012 and 2011:



	Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses
	Less than 12 Months				12 Months or Longer				Total
Temporarily Impaired Investment
Securities at December 31, 2012
State and municipal	$	4,524	$	19					$	4,524	$	19
U.S. Government-sponsored mortgage-backed securities	12,320		61						12,320		61
Corporate obligations					$	194	$	5,881	194		5,881
Total Temporarily Impaired Investment Securities	$	16,844	$	80	$	194	$	5,881	$	17,038	$	5,961

Temporarily Impaired Investment
Securities at December 31, 2011
U.S. Government-sponsored mortgage-backed securities	$	6,176	$	16					$	6,176	$	16
Corporate obligations					$	163	$	5,572	163		5,572
Total Temporarily Impaired Investment Securities	$	6,176	$	16	$	163	$	5,572	$	6,339	$	5,588

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, 2012
Due in one year or less	$	4,366	$	4,415	$	2,590	$	2,594
Due after one through five years	14,764		15,468		2,554		2,575
Due after five through ten years	54,148		57,442		57,811		60,163
Due after ten years	85,489		85,733		54,272		57,383
	$	158,767	$	163,058	$	117,227	$	122,715
U.S. Government-sponsored mortgage-backed securities	337,631		348,579		243,793		255,459
Equity securities	1,706		1,706
Total Investment Securities	$	498,104	$	513,343	$	361,020	$	378,174

- 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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