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Loans - Impaired Loans (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Contractual Principal Balance | $ 96,592 | $ 105,577
Recorded Investment With No Allowance | 53,751 | 43,083
Recorded Investment With Allowance | 23,423 | 37,314
Total Recorded Investment | 77,174 | 80,397
Related Allowance | 7,494 | 8,237
Commercial and industrial, Energy [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Contractual Principal Balance |  | 1,255
Recorded Investment With No Allowance |  |
Recorded Investment With Allowance |  | 1,069
Total Recorded Investment |  | 1,069
Related Allowance |  | 900
Commercial and industrial, Other commercial [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Contractual Principal Balance | 47,024 | 56,784
Recorded Investment With No Allowance | 28,127 | 21,709
Recorded Investment With Allowance | 8,437 | 19,096
Total Recorded Investment | 36,564 | 40,805
Related Allowance | 4,150 | 4,200
Commercial real estate, Buildings, land and other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Contractual Principal Balance | 46,772 | 44,652
Recorded Investment With No Allowance | 23,442 | 19,010
Recorded Investment With Allowance | 14,986 | 17,149
Total Recorded Investment | 38,428 | 36,159
Related Allowance | 3,344 | 3,137
Commercial real estate, Construction [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Contractual Principal Balance | 1,460 | 1,497
Recorded Investment With No Allowance | 1,015 | 1,100
Recorded Investment With Allowance |  |
Total Recorded Investment | 1,015 | 1,100
Related Allowance |  |
Consumer Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Contractual Principal Balance | 933 | 961
Recorded Investment With No Allowance | 802 | 864
Recorded Investment With Allowance |  |
Total Recorded Investment | 802 | 864
Related Allowance |  |
Consumer and Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Contractual Principal Balance | 403 | 428
Recorded Investment With No Allowance | 365 | 400
Recorded Investment With Allowance |  |
Total Recorded Investment | 365 | 400
Related Allowance |  |

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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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