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Loans and Allowance for Loan Losses - Impaired Loans Segregated by Class of Loans (Detail) (USD $) In Thousands, unless otherwise specified | 9 Months Ended
--- | ---
Sep. 30, 2013 | Sep. 30, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | $ 44,531 | $ 52,140
Recorded Investment with Allowance | 39,856 | 47,482
Related Allowance | 3,570 | 4,276
Average Recorded Investment | 43,509 | 47,601
Non-residential real estate owner occupied [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 993 | 7,058
Recorded Investment with Allowance | 924 | 6,094
Related Allowance | 34 | 232
Average Recorded Investment | 700 | 6,237
Non-residential real estate other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 25,724 | 20,535
Recorded Investment with Allowance | 24,216 | 20,340
Related Allowance | 2,240 | 1,581
Average Recorded Investment | 25,871 | 20,496
Residential real estate permanent mortgage [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 1,263 | 1,299
Recorded Investment with Allowance | 1,068 | 1,089
Related Allowance | 57 | 30
Average Recorded Investment | 1,298 | 1,184
Residential real estate all other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 2,423 | 4,365
Recorded Investment with Allowance | 2,020 | 4,047
Related Allowance | 381 | 1,344
Average Recorded Investment | 3,668 | 4,149
Non-consumer non-real estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 1,931 | 3,144
Recorded Investment with Allowance | 1,599 | 2,539
Related Allowance | 396 | 677
Average Recorded Investment | 1,508 | 1,745
Consumer non-real estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 413 | 447
Recorded Investment with Allowance | 394 | 424
Related Allowance | 67 | 77
Average Recorded Investment | 444 | 364
Other loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 1,905 | 2,420
Recorded Investment with Allowance | 1,782 | 2,265
Related Allowance | 300 | 264
Average Recorded Investment | 1,911 | 1,975
Acquired loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 9,879 | 12,872
Recorded Investment with Allowance | 7,853 | 10,684
Related Allowance | 95 | 71
Average Recorded Investment | $ 8,109 | $ 11,451

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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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