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Allowance for Loan Losses - Allowance Calculation at the Segment Level and Adjusted Beginning Balance for the Allowance for Credit Losses (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method | $ 3,800 |  |  |
Allowance for Loan and Lease Losses, Reserve Estimate Methodology, Historical Loss Period Factor |  | 84 months |  |
Beginning balance |  | $ 56,494 | $ 54,352 |
Charge-offs |  | 20,799 | 14,290 | $ 24,780
Recoveries |  | (20,030) | (11,442) | (26,997)
Net charge-offs (recoveries) |  | 769 | 2,848 | (2,217)
Provision (Recovery) |  | (5,101) | 4,990 | (7,333)
Ending balance |  | 50,624 | 56,494 | 54,352
Commercial, financial and agricultural |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Beginning balance |  | 13,694 | 10,719 |
Charge-offs |  | 5,786 | 2,478 | 3,779
Recoveries |  | (1,259) | (1,373) | (1,003)
Net charge-offs (recoveries) |  | 4,527 | 1,105 | 2,776
Provision (Recovery) |  | 4,267 | 4,080 | (723)
Ending balance |  |  | 13,694 | 10,719
Commercial real estate |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Beginning balance |  | 9,197 | 8,808 |
Charge-offs |  | 412 | 348 | 8,003
Recoveries |  | (3,671) | (2,241) | (7,759)
Net charge-offs (recoveries) |  | (3,259) | (1,893) | 244
Provision (Recovery) |  | (2,024) | (1,504) | (6,847)
Ending balance |  |  | 9,197 | 8,808
Construction real estate |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Beginning balance |  | 8,564 | 8,652 |
Charge-offs |  | 1,436 | 470 | 1,316
Recoveries |  | (8,559) | (2,092) | (12,572)
Net charge-offs (recoveries) |  | (7,123) | (1,622) | (11,256)
Provision (Recovery) |  | (10,440) | (1,710) | (9,459)
Ending balance |  |  | 8,564 | 8,652
Residential real estate |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Beginning balance |  | 13,514 | 14,772 |
Charge-offs |  | 3,014 | 2,352 | 3,944
Recoveries |  | (2,446) | (2,438) | (2,985)
Net charge-offs (recoveries) |  | 568 | (86) | 959
Provision (Recovery) |  | (1,988) | (1,344) | 1,480
Ending balance |  |  | 13,514 | 14,772
Consumer |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Beginning balance |  | 11,524 | 11,401 |
Charge-offs |  | 10,151 | 8,642 | 7,738
Recoveries |  | (4,094) | (3,295) | (2,671)
Net charge-offs (recoveries) |  | 6,057 | 5,347 | 5,067
Provision (Recovery) |  | 5,086 | 5,470 | 8,223
Ending balance |  |  | 11,524 | 11,401
Leases |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Beginning balance |  | 1 | 0 |
Charge-offs |  | 0 | 0 | 0
Recoveries |  | (1) | (3) | (7)
Net charge-offs (recoveries) |  | (1) | (3) | (7)
Provision (Recovery) |  | $ (2) | (2) | (7)
Ending balance |  |  | $ 1 | $ 0

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- Definition Allowance for Loan and Lease Losses, Reserve Estimate Methodology, Historical Loss Period Factor + References No definition available. + Details
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- Definition Financing Receivables Allowance For Credit Losses Net Charge Offs + References No definition available. + Details
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- Definition The effect of a change in method or methods for calculating the allowance for credit losses on the current period provision. + 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 (d) -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + 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=66008989&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=66008989&loc=SL6953423-111524 + Details
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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for 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 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524 Reference 2: 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=66008989&loc=SL6953423-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 + 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 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524 Reference 2: 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 Reference 3: 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=66902209&loc=d3e3602-108585 + Details
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