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Loans and Allowance for Credit Losses - Allowance for Credit Losses (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2013
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |
Beginning Balance | $ 54,225 | $ 67,187 |
Charge-offs | (3,646) | (10,476) |
Recoveries | 696 | 1,054 |
Provision for Loan, Lease, and Other Losses | 3,231 | 4,497 |
Ending Balance | 54,506 | 62,262 |
Ending balance: individually evaluated for impaired | 10,503 | 12,689 |
Ending balance: collectively evaluated for impaired | 44,003 | 49,573 |
Loans and Leases Receivable, Gross | 4,252,213 |  | 4,283,833
Total | 4,252,213 | 4,218,810 | 4,283,833
Ending balance: individually evaluated for impaired | 49,403 | 71,421 |
Ending balance: collectively evaluated for impaired | 4,202,810 | 4,147,389 |
Commercial, financial, agricultural and other [Member] |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |
Beginning Balance | 22,663 | 19,852 |
Charge-offs | (1,601) | (538) |
Recoveries | 85 | 128 |
Provision for Loan, Lease, and Other Losses | 4,978 | 833 |
Ending Balance | 26,125 | 20,275 |
Ending balance: individually evaluated for impaired | 9,886 | 9,846 |
Ending balance: collectively evaluated for impaired | 16,239 | 10,429 |
Loans and Leases Receivable, Gross | 1,017,412 |  | 1,021,056
Total |  | 1,057,663 |
Ending balance: individually evaluated for impaired | 31,730 | 33,322 |
Ending balance: collectively evaluated for impaired | 985,682 | 1,024,341 |
Real estate construction [Member] |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |
Beginning Balance | 6,600 | 8,928 |
Charge-offs | 0 | (84) |
Recoveries | 169 | 12 |
Provision for Loan, Lease, and Other Losses | (555) | (1,123) |
Ending Balance | 6,214 | 7,733 |
Ending balance: individually evaluated for impaired | 74 | 503 |
Ending balance: collectively evaluated for impaired | 6,140 | 7,230 |
Loans and Leases Receivable, Gross | 95,110 |  | 93,289
Total |  | 70,461 |
Ending balance: individually evaluated for impaired | 2,797 | 8,917 |
Ending balance: collectively evaluated for impaired | 92,313 | 61,544 |
Residential real estate [Member] |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |
Beginning Balance | 7,727 | 5,908 |
Charge-offs | (1,095) | (322) |
Recoveries | 244 | 723 |
Provision for Loan, Lease, and Other Losses | (850) | (560) |
Ending Balance | 6,026 | 5,749 |
Ending balance: individually evaluated for impaired | 496 | 1,091 |
Ending balance: collectively evaluated for impaired | 5,530 | 4,658 |
Loans and Leases Receivable, Gross | 1,240,169 |  | 1,262,718
Total |  | 1,255,515 |
Ending balance: individually evaluated for impaired | 9,103 | 7,813 |
Ending balance: collectively evaluated for impaired | 1,231,066 | 1,247,702 |
Commercial Real Estate [Member] |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |
Beginning Balance | 11,778 | 22,441 |
Charge-offs | (140) | (8,544) |
Recoveries | 20 | 97 |
Provision for Loan, Lease, and Other Losses | (539) | 4,476 |
Ending Balance | 11,119 | 18,470 |
Ending balance: individually evaluated for impaired | 47 | 1,249 |
Ending balance: collectively evaluated for impaired | 11,072 | 17,221 |
Loans and Leases Receivable, Gross | 1,290,852 |  | 1,296,472
Total |  | 1,243,676 |
Ending balance: individually evaluated for impaired | 5,773 | 21,369 |
Ending balance: collectively evaluated for impaired | 1,285,079 | 1,222,307 |
Loans to individuals [Member] |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |
Beginning Balance | 5,457 | 4,132 |
Charge-offs | (810) | (988) |
Recoveries | 178 | 94 |
Provision for Loan, Lease, and Other Losses | 197 | 901 |
Ending Balance | 5,022 | 4,139 |
Ending balance: individually evaluated for impaired | 0 | 0 |
Ending balance: collectively evaluated for impaired | 5,022 | 4,139 |
Loans and Leases Receivable, Gross | 608,670 |  | 610,298
Total |  | 591,495 |
Ending balance: individually evaluated for impaired | 0 | 0 |
Ending balance: collectively evaluated for impaired | 608,670 | 591,495 |
Unallocated [Member] |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |
Beginning Balance | 0 | 5,926 |
Charge-offs | 0 | 0 |
Recoveries | 0 | 0 |
Provision for Loan, Lease, and Other Losses | 0 | (30) |
Ending Balance | 0 | 5,896 |
Ending balance: individually evaluated for impaired | 0 | 0 |
Ending balance: collectively evaluated for impaired | $ 0 | $ 5,896 |

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- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953423-111524 + Details
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- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953423-111524 + Details
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- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953423-111524 + Details
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- Definition Amount of recovery of financing receivables doubtful of collection that were previously charged off. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953423-111524 + Details
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- Definition Amount of direct write-downs of financing receivables charged against the allowance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953423-111524 + Details
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- Definition The balance of financing receivables that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953423-111524 + Details
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- Definition The balance of financing receivables that were individually evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953423-111524 + Details
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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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- Definition Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. 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 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5074-111524 Reference 2: 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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- Definition Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953423-111524 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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