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Disclosures about fair value of assets and liabilities (Details 2) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012
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 |  |  |  |  |
Included in net income |  |  | $ (408) | $ 280 |
Hedged loans [Member] |  |  |  |  |
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 |  |  |  |  |
Beginning balance |  |  |  | 54,362 | 54,362
Included in net income | (1,444) | 298 | (1,846) | 224 | (74)
Purchases, issuances, and settlements |  |  |  |  | 6,114
Principal payments |  |  |  |  | (491)
Transfers out to Level 2 |  |  |  |  | (59,911)
Ending balance |  |  |  |  |
Forward sale commitments [Member] |  |  |  |  |
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 |  |  |  |  |
Beginning balance |  |  |  | 662 | 662
Included in net income |  |  |  |  | (152)
Transfers out to Level 2 |  |  |  |  | (510)
Ending balance |  |  |  |  |
Interest rate swap agreements [Member] |  |  |  |  |
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 |  |  |  |  |
Beginning balance |  |  |  | (7,101) | (7,101)
Included in net income |  |  |  |  | 74
Included in other comprehensive income, gross |  |  |  |  | 563
Transfers out to Level 2 |  |  |  |  | 6,464
Ending balance |  |  |  |  |
Commitments to originate loans [Member] |  |  |  |  |
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 |  |  |  |  |
Beginning balance |  |  |  |  |
Included in net income |  |  |  |  | (71)
Transfers out to Level 2 |  |  |  |  | 71
Ending balance |  |  |  |  |

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- Definition Fair value measurement with unobservable inputs reconciliation recurring basis principal payments. + References No definition available. + Details
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- Definition Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized in other comprehensive income (loss) for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1a) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Amount of purchases, (sales), issuances and (settlements) of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph c -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Amount of transfer of financial instrument classified as an asset into (out of) level 3 of the fair value hierarchy. + References No definition available. + Details
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- Definition Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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