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Allowance for Loan Losses - Recorded Investments in Loans (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Individually evaluated for impairment | $ 51,179 | $ 35,278
Collectively evaluated for impairment | 9,466,195 | 8,825,597
Loans, net of unearned income | 9,689,638 | 9,083,129
Receivables Acquired with Deteriorated Credit Quality |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Acquired with deteriorated credit quality | 172,264 | 222,254
Commercial, financial, agricultural |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Individually evaluated for impairment | 8,460 | 2,445
Collectively evaluated for impairment | 1,329,974 | 1,264,324
Loans, net of unearned income | 1,367,972 | 1,295,912
Commercial, financial, agricultural | Receivables Acquired with Deteriorated Credit Quality |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Acquired with deteriorated credit quality | 29,538 | 29,143
Real estate – construction |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Individually evaluated for impairment | 12,416 | 10,043
Collectively evaluated for impairment | 813,204 | 730,625
Loans, net of unearned income | 826,483 | 740,668
Real estate – construction | Receivables Acquired with Deteriorated Credit Quality |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Acquired with deteriorated credit quality | 863 | 0
Real estate – 1-4 family mortgage |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Individually evaluated for impairment | 20,262 | 14,238
Collectively evaluated for impairment | 2,810,808 | 2,732,862
Loans, net of unearned income | 2,866,613 | 2,795,343
Real estate – 1-4 family mortgage | Receivables Acquired with Deteriorated Credit Quality |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Acquired with deteriorated credit quality | 35,543 | 48,243
Real estate – commercial mortgage |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Individually evaluated for impairment | 9,550 | 8,059
Collectively evaluated for impairment | 4,131,582 | 3,903,012
Loans, net of unearned income | 4,244,265 | 4,051,509
Real estate – commercial mortgage | Receivables Acquired with Deteriorated Credit Quality |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Acquired with deteriorated credit quality | 103,133 | 140,438
Installment loans to individuals |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Individually evaluated for impairment | 491 | 493
Collectively evaluated for impairment | 380,627 | 194,774
Loans, net of unearned income | 384,305 | 199,697
Installment loans to individuals | Receivables Acquired with Deteriorated Credit Quality |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Acquired with deteriorated credit quality | $ 3,187 | $ 4,430

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118952595&loc=d3e4428-111522 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5074-111524 + Details
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