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Accounting for Certain Loans Acquired in a Transfer - Amounts of Loans (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding balance | $ 1,343,021 | $ 1,068,828
Carrying amount, net of allowance | 1,325,390 | 1,051,943
Loans Purchased With Evidence Of Credit Deterioration [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding balance | 138,368 | 60,294
Carrying amount, net of allowance | 138,163 | 59,905
Loans Purchased With Evidence Of Credit Deterioration [Member] | Commercial [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding balance | 86,173 | 37,048
Loans Purchased With Evidence Of Credit Deterioration [Member] | Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding balance | 34,802 | 11,761
Loans Purchased With Evidence Of Credit Deterioration [Member] | Consumer [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding balance | 17,393 | 11,485
Loans Purchased With Evidence Of Credit Deterioration [Member] | Heartland [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding balance | 36,869 | 60,294
Loans Purchased With Evidence Of Credit Deterioration [Member] | Heartland [Member] | Commercial [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding balance | 18,527 | 37,048
Loans Purchased With Evidence Of Credit Deterioration [Member] | Heartland [Member] | Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding balance | 10,055 | 11,761
Loans Purchased With Evidence Of Credit Deterioration [Member] | Heartland [Member] | Consumer [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding balance | 8,287 | 11,485
Loans Purchased With Evidence Of Credit Deterioration [Member] | Summit [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding balance | 101,499 |
Loans Purchased With Evidence Of Credit Deterioration [Member] | Summit [Member] | Commercial [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding balance | 67,646 |
Loans Purchased With Evidence Of Credit Deterioration [Member] | Summit [Member] | Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding balance | 24,747 |
Loans Purchased With Evidence Of Credit Deterioration [Member] | Summit [Member] | Consumer [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding balance | $ 9,106 |

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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522 + Details
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- Definition Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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