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Non Purchased Loans - Loan Portfolio by Risk-rating Grades (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | $ 9,689,638 | $ 9,083,129
Commercial, financial, agricultural |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 1,367,972 | 1,295,912
Real estate – construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 826,483 | 740,668
Real estate – 1-4 family mortgage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 2,866,613 | 2,795,343
Real estate – commercial mortgage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 4,244,265 | 4,051,509
Installment loans to individuals |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 384,305 | 199,697
Non-Purchased |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 7,587,974 | 6,389,712
Non-Purchased | Internal Noninvestment Grade |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 4,654,842 | 3,829,377
Non-Purchased | Pass |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 4,555,462 | 3,705,961
Non-Purchased | Watch |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 48,173 | 79,882
Non-Purchased | Substandard |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 51,207 | 43,534
Non-Purchased | Commercial, financial, agricultural | Internal Noninvestment Grade |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 803,462 | 641,102
Non-Purchased | Commercial, financial, agricultural | Pass |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 779,798 | 615,803
Non-Purchased | Commercial, financial, agricultural | Watch |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 11,949 | 18,326
Non-Purchased | Commercial, financial, agricultural | Substandard |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 11,715 | 6,973
Non-Purchased | Real estate – construction | Internal Noninvestment Grade |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 708,660 | 568,968
Non-Purchased | Real estate – construction | Pass |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 698,950 | 558,494
Non-Purchased | Real estate – construction | Watch |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 501 | 2,317
Non-Purchased | Real estate – construction | Substandard |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 9,209 | 8,157
Non-Purchased | Real estate – 1-4 family mortgage | Internal Noninvestment Grade |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 346,507 | 330,484
Non-Purchased | Real estate – 1-4 family mortgage | Pass |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 339,079 | 321,564
Non-Purchased | Real estate – 1-4 family mortgage | Watch |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 3,856 | 4,660
Non-Purchased | Real estate – 1-4 family mortgage | Substandard |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 3,572 | 4,260
Non-Purchased | Real estate – commercial mortgage | Internal Noninvestment Grade |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 2,796,207 | 2,288,823
Non-Purchased | Real estate – commercial mortgage | Pass |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 2,737,629 | 2,210,100
Non-Purchased | Real estate – commercial mortgage | Watch |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 31,867 | 54,579
Non-Purchased | Real estate – commercial mortgage | Substandard |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 26,711 | 24,144
Non-Purchased | Installment loans to individuals | Internal Noninvestment Grade |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 6 | 0
Non-Purchased | Installment loans to individuals | Pass |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 6 | 0
Non-Purchased | Installment loans to individuals | Watch |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 0 | 0
Non-Purchased | Installment loans to individuals | Substandard |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | $ 0 | $ 0

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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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