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Loans and Allowance for Credit Losses - Credit Risk Profile by Creditworthiness (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | $ 4,411,481 | $ 4,283,833
Pass [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 4,272,032 | 4,121,472
OAEM [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 75,725 | 79,124
Substandard [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 59,804 | 83,237
Doubtful [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 3,920 | 0
Total Non-Pass [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 139,449 | 162,361
Commercial, financial, agricultural and other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 1,071,531 | 1,021,056
Commercial, financial, agricultural and other [Member] | Pass [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 996,609 | 943,107
Commercial, financial, agricultural and other [Member] | OAEM [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 40,620 | 35,429
Commercial, financial, agricultural and other [Member] | Substandard [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 30,382 | 42,520
Commercial, financial, agricultural and other [Member] | Doubtful [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 3,920 | 0
Commercial, financial, agricultural and other [Member] | Total Non-Pass [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 74,922 | 77,949
Real estate construction [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 115,788 | 93,289
Real estate construction [Member] | Pass [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 106,989 | 79,679
Real estate construction [Member] | OAEM [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 8,222 | 9,710
Real estate construction [Member] | Substandard [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 577 | 3,900
Real estate construction [Member] | Doubtful [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 0 | 0
Real estate construction [Member] | Total Non-Pass [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 8,799 | 13,610
Residential real estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 1,234,842 | 1,262,718
Residential real estate [Member] | Pass [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 1,223,231 | 1,245,422
Residential real estate [Member] | OAEM [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 1,874 | 5,161
Residential real estate [Member] | Substandard [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 9,737 | 12,135
Residential real estate [Member] | Doubtful [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 0 | 0
Residential real estate [Member] | Total Non-Pass [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 11,611 | 17,296
Commercial Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 1,345,302 | 1,296,472
Commercial Real Estate [Member] | Pass [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 1,301,447 | 1,243,170
Commercial Real Estate [Member] | OAEM [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 25,009 | 28,823
Commercial Real Estate [Member] | Substandard [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 18,846 | 24,479
Commercial Real Estate [Member] | Doubtful [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 0 | 0
Commercial Real Estate [Member] | Total Non-Pass [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 43,855 | 53,302
Loans to individuals [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 644,018 | 610,298
Loans to individuals [Member] | Pass [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 643,756 | 610,094
Loans to individuals [Member] | OAEM [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 0 | 1
Loans to individuals [Member] | Substandard [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 262 | 203
Loans to individuals [Member] | Doubtful [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 0 | 0
Loans to individuals [Member] | Total Non-Pass [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | $ 262 | $ 204

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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522 + Details
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