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Fair Value (Details 4) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Jun. 30, 2013 | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | --- | --- | ---
Carrying amount and estimated fair value of financial instruments |  |  |  |
Securities available-for-sale | $ 872,675 |  | $ 691,000 |
Restricted stock | 21,050 |  | 21,292 |
FDIC Indemnification Asset | 1,171 | 1,515 | 2,632 | 2,384
Accrued interest receivable | 11,767 |  | 12,024 |
Deposits | (2,487,028) |  | (2,276,134) |
Level 1 |  |  |  |
Carrying amount and estimated fair value of financial instruments |  |  |  |
Cash and due from banks | 20,404 |  | 21,333 |
Federal funds sold | 0 |  | 0 |
Securities available-for-sale | 662 |  | 380 |
Restricted stock | 0 |  | 0 |
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 | 60,495 |  | 65,897 |
Federal funds sold | 3,420 |  | 20,800 |
Securities available-for-sale | 859,965 |  | 674,587 |
Restricted stock | 0 |  | 0 |
Loans, net |  |  | 0 |
FDIC Indemnification Asset | 1,171 |  | 2,632 |
Accrued interest receivable | 3,475 |  | 2,980 |
Deposits | (2,489,329) |  | (2,280,910) |
Short-term borrowings | (27,929) |  | (40,551) |
Federal Home Loan Bank advances | (60,721) |  | (124,933) |
Accrued interest payable | (770) |  | (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 | 12,048 |  | 16,033 |
Restricted stock | 0 |  | 0 |
Loans, net | 1,845,392 |  | 1,916,256 |
FDIC Indemnification Asset | 0 |  | 0 |
Accrued interest receivable | 8,292 |  | 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 | 80,899 |  | 87,230 |
Federal funds sold | 3,420 |  | 20,800 |
Securities available-for-sale | 872,675 |  | 691,000 |
Restricted stock | 21,050 |  | 21,292 |
Loans, net | 1,786,601 |  | 1,829,978 |
FDIC Indemnification Asset | 1,171 |  | 2,632 |
Accrued interest receivable | 11,767 |  | 12,024 |
Deposits | (2,487,028) |  | (2,276,134) |
Short-term borrowings | (27,929) |  | (40,551) |
Federal Home Loan Bank advances | (58,362) |  | (119,705) |
Accrued interest payable | (770) |  | (1,163) |
Fair Value |  |  |  |
Carrying amount and estimated fair value of financial instruments |  |  |  |
Cash and due from banks | 80,899 |  | 87,230 |
Federal funds sold | 3,420 |  | 20,800 |
Securities available-for-sale | 872,675 |  | 691,000 |
Restricted stock | 0 |  | 0 |
Loans, net | 1,845,392 |  | 1,916,256 |
FDIC Indemnification Asset | 1,171 |  | 2,632 |
Accrued interest receivable | 11,767 |  | 12,024 |
Deposits | (2,489,329) |  | (2,280,910) |
Short-term borrowings | (27,929) |  | (40,551) |
Federal Home Loan Bank advances | (60,721) |  | (124,933) |
Accrued interest payable | $ (770) |  | $ (1,163) |

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.12) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 9 + Details
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- Definition Carrying amount as of the balance sheet date of interest earned but not received. Also called accrued interest or accrued interest receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 8 -Article 5 + Details
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- Definition Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Glossary Loan -URI http://asc.fasb.org/extlink&oid=6517073 + Details
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- 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 the amount of short-term debt existing as of the balance sheet date. + References No definition available. + Details
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