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Loans and Allowance for Loan Losses - Impaired Loans Segregated by Class of Loans (Detail) (USD $) In Thousands, unless otherwise specified | 6 Months Ended
--- | ---
Jun. 30, 2014 | Jun. 30, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | $ 52,683 | $ 48,260
Recorded Investment with Allowance | 43,517 | 43,484
Related Allowance | 2,927 | 4,449
Average Recorded Investment | 41,938 | 44,884
Non-residential real estate owner occupied [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 542 | 814
Recorded Investment with Allowance | 476 | 748
Related Allowance | 22 | 28
Average Recorded Investment | 547 | 623
Non-residential real estate other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 23,886 | 27,297
Recorded Investment with Allowance | 22,122 | 25,859
Related Allowance | 1,710 | 2,363
Average Recorded Investment | 22,305 | 25,885
Residential real estate permanent mortgage [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 1,117 | 1,510
Recorded Investment with Allowance | 951 | 1,287
Related Allowance | 86 | 64
Average Recorded Investment | 931 | 1,277
Residential real estate all other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 1,768 | 3,694
Recorded Investment with Allowance | 1,581 | 3,294
Related Allowance | 215 | 1,189
Average Recorded Investment | 1,310 | 3,985
Non-consumer non-real estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 4,407 | 1,816
Recorded Investment with Allowance | 4,082 | 1,481
Related Allowance | 512 | 390
Average Recorded Investment | 2,151 | 1,536
Consumer non-real estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 568 | 517
Recorded Investment with Allowance | 553 | 495
Related Allowance | 141 | 79
Average Recorded Investment | 542 | 419
Other loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 1,048 | 2,253
Recorded Investment with Allowance | 880 | 2,090
Related Allowance | 153 | 278
Average Recorded Investment | 1,000 | 2,648
Acquired loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 19,347 | 10,359
Recorded Investment with Allowance | 12,872 | 8,230
Related Allowance | 88 | 58
Average Recorded Investment | $ 13,152 | $ 8,511

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- Definition Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5258-111524 + Details
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- Definition Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953550-111524 + Details
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- Definition Amount of allowance for credit losses related to recorded investment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5212-111524 + Details
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- Definition Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5212-111524 + Details
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