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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
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Jun. 30, 2013 | Jun. 30, 2012
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items] |  |
Unpaid Principal Balance | $ 48,260 | $ 52,067
Recorded Investment with Allowance | 43,484 | 47,579
Related Allowance | 4,449 | 4,454
Average Recorded Investment | 44,884 | 50,266
Non-residential real estate [Member] |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items] |  |
Unpaid Principal Balance | 28,111 | 28,184
Recorded Investment with Allowance | 26,607 | 27,165
Related Allowance | 2,391 | 2,122
Average Recorded Investment | 26,508 | 27,397
Residential real estate [Member] |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items] |  |
Unpaid Principal Balance | 5,204 | 5,839
Recorded Investment with Allowance | 4,581 | 5,384
Related Allowance | 1,253 | 1,468
Average Recorded Investment | 5,262 | 5,547
Non-consumer non-real estate [Member] |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items] |  |
Unpaid Principal Balance | 1,816 | 1,792
Recorded Investment with Allowance | 1,481 | 1,163
Related Allowance | 390 | 302
Average Recorded Investment | 1,536 | 1,512
Consumer non-real estate [Member] |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items] |  |
Unpaid Principal Balance | 517 | 349
Recorded Investment with Allowance | 495 | 325
Related Allowance | 79 | 59
Average Recorded Investment | 419 | 389
Other loans [Member] |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items] |  |
Unpaid Principal Balance | 2,253 | 2,255
Recorded Investment with Allowance | 2,090 | 2,020
Related Allowance | 278 | 212
Average Recorded Investment | 2,648 | 2,158
Acquired loans [Member] |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items] |  |
Unpaid Principal Balance | 10,359 | 13,648
Recorded Investment with Allowance | 8,230 | 11,522
Related Allowance | 58 | 291
Average Recorded Investment | $ 8,511 | $ 13,263

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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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