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Disclosures about fair value of assets and liabilities (Tables) | 12 Months Ended
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Dec. 31, 2012
Disclosures about Fair Value of Assets and Liabilities and Fair Value of Financial Instrument [Abstract] |
Fair value measurements of assets and liabilities recognized on a recurring basis |
|  |  |  |  | Quoted Prices in |  |  | Significant |  |  |  |
|  |  |  |  | Active Markets |  |  | Other |  |  | Significant |
|  |  |  |  | for Identical |  |  | Observable |  |  | Unobservable |
|  |  |  |  | Assets |  |  | Inputs |  |  | Inputs |
|  | Fair Value |  |  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |
December 31, 2012 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and federal agencies |  | $ | 51,779 |  |  | $ | — |  |  | $ | 51,779 |  |  | $ | — |
State and municipal |  |  | 172,905 |  |  |  | — |  |  |  | 172,905 |  |  |  | — |
Federal agency collateralized mortgage obligations |  |  | 96,831 |  |  |  | — |  |  |  | 96,831 |  |  |  | — |
Federal agency mortgage-backed pools |  |  | 159,204 |  |  |  | — |  |  |  | 159,204 |  |  |  | — |
Private labeled mortgage-backed pools |  |  | 2,031 |  |  |  | — |  |  |  | 2,031 |  |  |  | — |
Corporate notes |  |  | 51 |  |  |  | — |  |  |  | 51 |  |  |  | — |
Total available-for-sale securities |  |  | 482,801 |  |  |  | — |  |  |  | 482,801 |  |  |  | — |
Hedged loans |  |  | 81,018 |  |  |  | — |  |  |  | 81,018 |  |  |  | — |
Forward sale commitments |  |  | 858 |  |  |  | — |  |  |  | 858 |  |  |  | — |
Interest rate swap agreements |  |  | (7,707 | ) |  |  | — |  |  |  | (7,707 | ) |  |  | — |
Commitments to originate loans |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
December 31, 2011 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and federal agencies |  | $ | 13,022 |  |  | $ | — |  |  | $ | 13,022 |  |  | $ | — |
State and municipal |  |  | 143,890 |  |  |  | — |  |  |  | 143,890 |  |  |  | — |
Federal agency collateralized mortgage obligations |  |  | 91,122 |  |  |  | — |  |  |  | 91,122 |  |  |  | — |
Federal agency mortgage-backed pools |  |  | 179,351 |  |  |  | — |  |  |  | 179,351 |  |  |  | — |
Private labeled mortgage-backed pools |  |  | 3,636 |  |  |  | — |  |  |  | 3,636 |  |  |  | — |
Corporate notes |  |  | 24 |  |  |  | — |  |  |  | 24 |  |  |  | — |
Total available-for-sale securities |  |  | 431,045 |  |  |  | — |  |  |  | 431,045 |  |  |  | — |
Hedged loans |  |  | 54,362 |  |  |  | — |  |  |  | — |  |  |  | 54,362 |
Forward sale commitments |  |  | 662 |  |  |  | — |  |  |  | — |  |  |  | 662 |
Interest rate swap agreements |  |  | (7,102 | ) |  |  | — |  |  |  | — |  |  |  | (7,102 | )
Commitments to originate loans |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Schedule of fair value transfer among levels |
|  | Quoted Prices |  |  |  |  |  |  |  |  |
|  | in Active |  |  | Significant |  |  |  |  |  |
|  | Markets for |  |  | Other |  |  | Significant |  |  |
|  | Identical |  |  | Observable |  |  | Unobservable |  |  | Reason
|  | Assets |  |  | Inputs |  |  | Inputs |  |  | for
|  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |  |  | Transfer
Transfers to level: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Hedged loans |  | $ | — |  |  | $ | 59,911 |  |  | $ | — |  |  | (a)
Forward sale commitments |  |  | — |  |  |  | 510 |  |  |  | — |  |  | (b)
Interest rate swap agreements |  |  | — |  |  |  | (6,464 | ) |  |  | — |  |  | (a)
Commitments to originate loans |  |  | — |  |  |  | (71 | ) |  |  | — |  |  | (b)
Total transfers to level |  | $ | — |  |  | $ | 53,886 |  |  | $ | — |  |  |
Reconciliation of the beginning and ending balances of recurring fair value measurements recognized in the accompanying condensed consolidated balance sheet using significant unobservable (Level 3) inputs |
|  |  |  |  | Forward Sale |  |  | Interest Rate |  |  | Commitments to |
|  | Hedged Loans |  |  | Commitments |  |  | Swaps |  |  | Originate Loans |
Beginning balance December 31, 2011 |  | $ | 54,362 |  |  | $ | 662 |  |  | $ | (7,101 | ) |  | $ | — |
Total realized and unrealized gains and losses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Included in net income |  |  | (74 | ) |  |  | (152 | ) |  |  | 74 |  |  |  | (71 | )
Included in other comprehensive income, gross |  |  | — |  |  |  | — |  |  |  | 563 |  |  |  | — |
Purchases, issuances, and settlements |  |  | 6,114 |  |  |  | — |  |  |  | — |  |  |  | — |
Principal payments |  |  | (491 | ) |  |  | — |  |  |  | — |  |  |  | — |
Transfers out to Level 2 |  |  | (59,911 | ) |  |  | (510 | ) |  |  | 6,464 |  |  |  | 71 |
Ending balance December 31, 2012 |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
|  |  |  |  | Forward Sale |  |  | Interest Rate |  |  | Commitments to |
|  | Hedged Loans |  |  | Commitments |  |  | Swaps |  |  | Originate Loans |
Beginning balance December 31, 2010 |  | $ | 50,088 |  |  | $ | 407 |  |  | $ | (3,415 | ) |  | $ | — |
Total realized and unrealized gains and losses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Included in net income |  |  | 147 |  |  |  | 255 |  |  |  | (147 | ) |  |  | — |
Included in other comprehensive income, gross |  |  | — |  |  |  | — |  |  |  | (3,539 | ) |  |  | — |
Purchases, issuances, and settlements |  |  | 9,091 |  |  |  | — |  |  |  | — |  |  |  | — |
Principal payments |  |  | (4,964 | ) |  |  | — |  |  |  | — |  |  |  | — |
Ending balance December 31, 2011 |  | $ | 54,362 |  |  | $ | 662 |  |  | $ | (7,101 | ) |  | $ | — |
Realized gains and losses included in net income for the periods in the condensed consolidated statements of income |
|  | Years Ended December 31 |
|  | 2012 |  |  | 2011 |  |  | 2010 |
Non Interest Income |  |  |  |  |  |  |  |  |  |  |  |
Total gains and losses from: |  |  |  |  |  |  |  |  |  |  |  |
Hedged loans |  | $ | 28 |  |  | $ | 147 |  |  | $ | 898 |
Fair value interest rate swap agreements |  |  | (28 | ) |  |  | (147 | ) |  |  | (898 | )
Derivative loan commitments |  |  | 196 |  |  |  | 255 |  |  |  | (538 | )
|  | $ | 196 |  |  | $ | 255 |  |  | $ | (538 | )
Other assets measured at fair value on a nonrecurring basis |
|  |  |  |  | Quoted Prices in |  |  | Significant Other |  |  | Significant |
|  |  |  |  | Active Markets for |  |  | Observable |  |  | Unobservable |
|  |  |  |  | Identical Assets |  |  | Inputs |  |  | Inputs |
|  | Fair Value |  |  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |
December 31, 2012 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impaired loans |  | $ | 8,652 |  |  | $ | — |  |  | $ | — |  |  | $ | 8,652 |
Mortgage servicing rights |  |  | 5,145 |  |  |  | — |  |  |  | — |  |  |  | 5,145 |
December 31, 2011 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impaired loans |  | $ | 5,822 |  |  | $ | — |  |  | $ | — |  |  | $ | 5,822 |
Mortgage servicing rights |  |  | 4,193 |  |  |  | — |  |  |  | — |  |  |  | 4,193 |
Unobservable inputs in recurring and nonrecurring level 3 fair value measurements |
|  | Fair Value at |  |  | Valuation |  |  |  | Range (Weighted
|  | December 31, 2012 |  |  | Technique |  | Unobservable Inputs |  | Average)
Impaired loans |  |  | 8,652 |  |  | Collateral based measurement |  | Discount to reflect current market conditions and ultimate collectability |  | 10% - 15% (12%)
Mortgage servicing rights |  |  | 5,145 |  |  | Discounted cashflows |  | Discount rate, Constant prepayment rate, Probably of default |  | 10% -15% (12%), 4% - 7% (4.6%), 1% - 10% (4.5%)

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- Definition Tabular disclosure of the amount of gains or losses for the period included in earnings or resulted in a change to net assets, have arisen from the use of significant unobservable inputs (level 3) to measure the fair value of assets, liabilities, and financial instruments classified in shareholders' equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph d -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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c(1) -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. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1),(d) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of assets and liabilities by class, including financial instruments measured at fair value that are classified in shareholders' equity, if any, that are measured at fair value on a nonrecurring basis in periods after initial recognition (for example, impaired assets). Disclosures may include, but are not limited to: (a) the fair value measurements recorded and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements are categorized in their entirety (levels 1, 2, 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 33 -Subparagraph a, b -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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19296-110258 + Details
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- Definition Tabular disclosure of the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments, assets, and liabilities. Such certain disclosures about the financial instruments, assets, and liabilities include: (1) the fair value of the required items together with their carrying amounts (as appropriate) and (2) the methodology and assumptions used in developing such estimates of fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 14 -Subparagraph a -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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 159 -Paragraph 18 -Subparagraph c(2), d, e, f -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. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 15 -Subparagraph b-d -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. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13467-108611 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 159 -Paragraph 19 -Subparagraph a, b, c(1), d(1) -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. Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6447952&loc=d3e13220-108610 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph a, c(1), c(2), c(3), d -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. Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 10 -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. Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13476-108611 Reference 12: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612 + Details
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