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Fair Value (Details 5) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Carrying amount and estimated fair value of financial instruments
Securities available for sale	$ 769,949	$ 691,000
Restricted Stock	21,292	21,292
FDIC Indemnification Asset	1,770	2,632	2,384
Accrued interest receivable	11,622	12,024
Deposits	(2,349,776)	(2,276,134)
Level 1
Carrying amount and estimated fair value of financial instruments
Cash and due from banks	18,854	21,333
Federal funds sold	0	0
Securities available for sale	419	380
Loans, net	0	0
FDIC Indemnification Asset	0	0
Accrued interest receivable	0	0
Deposits	0	0
Short-term borrowings	0	0
Federal Home Loan Bank advances	0	0
Accrued interest payable	0	0
Level 2
Carrying amount and estimated fair value of financial instruments
Cash and due from banks	59,545	65,897
Federal funds sold	54,384	20,800
Securities available for sale	757,056	674,587
FDIC Indemnification Asset	1,770	2,632
Accrued interest receivable	3,295	2,980
Deposits	(2,353,844)	(2,280,910)
Short-term borrowings	(39,952)	(40,551)
Federal Home Loan Bank advances	(119,103)	(119,705)
Accrued interest payable	(1,053)	(1,163)
Level 3
Carrying amount and estimated fair value of financial instruments
Cash and due from banks	0	0
Federal funds sold	0	0
Securities available for sale	12,474	16,033
Loans, net	1,875,255	1,916,256
FDIC Indemnification Asset	0	0
Accrued interest receivable	8,327	9,044
Deposits	0	0
Short-term borrowings	0	0
Federal Home Loan Bank advances	0	0
Accrued interest payable	0	0
Carrying Value
Carrying amount and estimated fair value of financial instruments
Cash and due from banks	78,399	87,230
Federal funds sold	54,384	20,800
Securities available for sale	769,949	691,000
Restricted Stock	21,292	21,292
Loans, net	1,796,259	1,829,978
FDIC Indemnification Asset	1,770	2,632
Accrued interest receivable	11,622	12,024
Deposits	(2,349,776)	(2,276,134)
Short-term borrowings	(39,952)	(40,551)
Federal Home Loan Bank advances	(114,608)	(119,705)
Accrued interest payable	(1,053)	(1,163)
Fair Value
Carrying amount and estimated fair value of financial instruments
Cash and due from banks	78,399	87,230
Federal funds sold	54,384	20,800
Securities available for sale	769,949	691,000
Loans, net	1,875,255	1,916,256
FDIC Indemnification Asset	1,770	2,632
Accrued interest receivable	11,693	12,024
Deposits	(2,353,844)	(2,280,910)
Short-term borrowings	(39,952)	(40,551)
Federal Home Loan Bank advances	(119,103)	(124,993)
Accrued interest payable	$ (1,053)	$ (1,163)

X

- Definition

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 Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-Subparagraph (b)

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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 includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Company may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months.

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 8

-Footnote 2

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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-Paragraph 7, 8, 9, 10

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-Name Accounting Standards Codification

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The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others.

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Carrying amount of receivable assets originating from the indemnification agreement with the Federal Deposit Insurance Corporation (FDIC), in which the FDIC is to partially cover losses.

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-Name Audit and Accounting Guide (AAG)

-Number AAG-DEP

-Paragraph 4

-IssueDate 2006-05-01

-Chapter 14

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid.

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Carrying amount as of the balance sheet date of interest earned but not received. Also called accrued interest or accrued interest receivable.

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Investments which are not defined as or included in marketable (debt, equity, or other) securities whose use is restricted in whole or in part, generally by contractual agreements or regulatory requirements. For use in an unclassified balance sheet.

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