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Loans and Allowance for Loan Losses - Impaired Loans Segregated by Class of Loans (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | $ 43,130 | $ 49,972
Recorded Investment with Allowance | 38,326 | 45,173
Related Allowance | 3,478 | 4,492
Average Recorded Investment | 39,262 | 42,519
Non-residential real estate owner occupied [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 877 | 596
Recorded Investment with Allowance | 752 | 535
Related Allowance | 28 | 24
Average Recorded Investment | 881 | 1,557
Non-residential real estate other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 24,964 | 27,502
Recorded Investment with Allowance | 23,351 | 26,147
Related Allowance | 2,161 | 2,187
Average Recorded Investment | 23,816 | 21,726
Residential real estate primary mortgage [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 1,253 | 1,297
Recorded Investment with Allowance | 1,025 | 1,084
Related Allowance | 58 | 43
Average Recorded Investment | 1,170 | 1,123
Residential real estate all other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 2,214 | 4,172
Recorded Investment with Allowance | 1,803 | 3,829
Related Allowance | 361 | 1,285
Average Recorded Investment | 1,857 | 4,062
Non-consumer non-real estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 1,801 | 1,949
Recorded Investment with Allowance | 1,459 | 1,539
Related Allowance | 388 | 439
Average Recorded Investment | 1,553 | 1,641
Consumer non-real estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 628 | 419
Recorded Investment with Allowance | 611 | 398
Related Allowance | 139 | 87
Average Recorded Investment | 455 | 357
Other loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 1,545 | 2,957
Recorded Investment with Allowance | 1,464 | 2,561
Related Allowance | 219 | 344
Average Recorded Investment | 1,602 | 2,323
Acquired loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 9,848 | 11,080
Recorded Investment with Allowance | 7,861 | 9,080
Related Allowance | 124 | 83
Average Recorded Investment | $ 7,928 | $ 9,730

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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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