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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 | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for Loan and Lease Losses, Reserve Estimate Methodology, Historical Loss Period Factor | 108 months | 96 months |
Beginning balance | $ 49,988 | $ 50,624 | $ 56,494
Charge-offs | 13,552 | 19,403 | 20,799
Recoveries | (7,131) | (10,210) | (20,030)
Net charge-offs (recoveries) | 6,421 | 9,193 | 769
Provision (Recovery) | 7,945 | 8,557 | (5,101)
Ending balance | 51,512 | 49,988 | 50,624
Commercial, financial and agricultural |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 15,022 | 13,434 | 13,694
Charge-offs | 2,796 | 6,017 | 5,786
Recoveries | (1,221) | (809) | (1,259)
Net charge-offs (recoveries) | 1,575 | 5,208 | 4,527
Provision (Recovery) | 3,330 | 6,796 | 4,267
Ending balance | 16,777 | 15,022 | 13,434
Commercial real estate |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 9,601 | 10,432 | 9,197
Charge-offs | 281 | 1,798 | 412
Recoveries | (272) | (810) | (3,671)
Net charge-offs (recoveries) | 9 | 988 | (3,259)
Provision (Recovery) | 176 | 157 | (2,024)
Ending balance | 9,768 | 9,601 | 10,432
Construction real estate |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 4,430 | 5,247 | 8,564
Charge-offs | 72 | 105 | 1,436
Recoveries | (712) | (2,124) | (8,559)
Net charge-offs (recoveries) | (640) | (2,019) | (7,123)
Provision (Recovery) | (607) | (2,836) | (10,440)
Ending balance | 4,463 | 4,430 | 5,247
Residential real estate |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 9,321 | 10,958 | 13,514
Charge-offs | 441 | 1,208 | 3,014
Recoveries | (844) | (1,863) | (2,446)
Net charge-offs (recoveries) | (403) | (655) | 568
Provision (Recovery) | (993) | (2,292) | (1,988)
Ending balance | 8,731 | 9,321 | 10,958
Consumer |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 11,614 | 10,553 | 11,524
Charge-offs | 9,962 | 10,275 | 10,151
Recoveries | (4,078) | (4,603) | (4,094)
Net charge-offs (recoveries) | 5,884 | 5,672 | 6,057
Provision (Recovery) | 6,043 | 6,733 | 5,086
Ending balance | 11,773 | 11,614 | 10,553
Leases |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 0 | 0 | 1
Charge-offs | 0 | 0 | 0
Recoveries | (4) | (1) | (1)
Net charge-offs (recoveries) | (4) | (1) | (1)
Provision (Recovery) | (4) | (1) | (2)
Ending balance | $ 0 | $ 0 | $ 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 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=84173941&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=84173941&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://fasb.org/us-gaap/role/ref/legacyRef -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 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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=82894903&loc=d3e15032-111544 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -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 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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