Securities, Held to Maturity (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Held to maturity [Abstract]
Amortized Cost	$ 166,947	$ 160,539
Gross Unrealized Gains	8,431	10,523
Gross Unrealized Losses	1,160	216
Fair Value	174,218	170,846
U.S. Government Agencies and Corporations [Member]
Held to maturity [Abstract]
Amortized Cost	13,985	7,988
Gross Unrealized Gains	507	563
Gross Unrealized Losses	33	0
Fair Value	14,459	8,551
State and Political Subdivisions [Member]
Held to maturity [Abstract]
Amortized Cost	151,668	151,209
Gross Unrealized Gains	7,851	9,880
Gross Unrealized Losses	1,127	216
Fair Value	158,392	160,873
Mortgage-Backed Securities [Member]
Held to maturity [Abstract]
Amortized Cost	644	691
Gross Unrealized Gains	72	73
Gross Unrealized Losses	0	0
Fair Value	716	764
Corporate Debt Securities [Member]
Held to maturity [Abstract]
Amortized Cost	650	651
Gross Unrealized Gains	1	7
Gross Unrealized Losses	0	0
Fair Value	$ 651	$ 658

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents investments in debt securities which are categorized as held-to-maturity and that have scheduled maturities more than one year from the balance sheet date or operating cycle, if longer; such investments are normally measured at amortized cost (carrying value) unless circumstances indicate that the value to be recovered from the investment is less than its carried amount. The held-to-maturity category is for those securities that the Company has the positive intent and ability to hold until maturity.

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As of the balance sheet date, the excess of fair value over carrying value (amortized cost) of a debt security categorized as held-to-maturity, exclusive of dividend or interest income recognized but not yet received and exclusive of any write-downs for other-than-temporary impairment. Such item represents the gross unrecognized holding gain.

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- Definition

As of the balance sheet date, the excess of carrying value (amortized cost) over fair value of a debt security categorized as held-to-maturity, exclusive of dividend or interest income recognized but not yet received and exclusive of any write-downs for other-than-temporary impairment. Such item represents the gross unrecognized holding loss.

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