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Purchased Loans - Loan Portfolio by Risk-Rating Grades (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Loan portfolio by risk-rating grades |  |
Total | $ 9,054,654 | $ 9,083,129
Commercial, financial, agricultural |  |
Loan portfolio by risk-rating grades |  |
Total | 1,305,076 | 1,295,912
Real estate – construction |  |
Loan portfolio by risk-rating grades |  |
Total | 781,531 | 740,668
Real estate – 1-4 family mortgage |  |
Loan portfolio by risk-rating grades |  |
Total | 2,765,472 | 2,795,343
Real estate – commercial mortgage |  |
Loan portfolio by risk-rating grades |  |
Total | 4,017,969 | 4,051,509
Installment loans to individuals |  |
Loan portfolio by risk-rating grades |  |
Total | 184,606 | 199,697
Purchased loans |  |
Loan portfolio by risk-rating grades |  |
Total | 2,350,366 | 2,693,417
Purchased loans | Internal Noninvestment Grade |  |
Loan portfolio by risk-rating grades |  |
Total | 1,628,846 | 1,852,090
Purchased loans | Pass |  |
Loan portfolio by risk-rating grades |  |
Total | 1,503,584 | 1,746,683
Purchased loans | Watch |  |
Loan portfolio by risk-rating grades |  |
Total | 92,831 | 84,250
Purchased loans | Substandard |  |
Loan portfolio by risk-rating grades |  |
Total | 32,431 | 21,157
Purchased loans | Commercial, financial, agricultural |  |
Loan portfolio by risk-rating grades |  |
Total | 374,478 | 420,263
Purchased loans | Commercial, financial, agricultural | Internal Noninvestment Grade |  |
Loan portfolio by risk-rating grades |  |
Total | 336,797 | 369,748
Purchased loans | Commercial, financial, agricultural | Pass |  |
Loan portfolio by risk-rating grades |  |
Total | 299,893 | 333,147
Purchased loans | Commercial, financial, agricultural | Watch |  |
Loan portfolio by risk-rating grades |  |
Total | 24,250 | 33,857
Purchased loans | Commercial, financial, agricultural | Substandard |  |
Loan portfolio by risk-rating grades |  |
Total | 12,654 | 2,744
Purchased loans | Real estate – construction |  |
Loan portfolio by risk-rating grades |  |
Total | 65,402 | 105,149
Purchased loans | Real estate – construction | Internal Noninvestment Grade |  |
Loan portfolio by risk-rating grades |  |
Total | 63,553 | 101,964
Purchased loans | Real estate – construction | Pass |  |
Loan portfolio by risk-rating grades |  |
Total | 63,553 | 101,122
Purchased loans | Real estate – construction | Watch |  |
Loan portfolio by risk-rating grades |  |
Total | 0 | 0
Purchased loans | Real estate – construction | Substandard |  |
Loan portfolio by risk-rating grades |  |
Total | 0 | 842
Purchased loans | Real estate – 1-4 family mortgage |  |
Loan portfolio by risk-rating grades |  |
Total | 604,855 | 707,453
Purchased loans | Real estate – 1-4 family mortgage | Internal Noninvestment Grade |  |
Loan portfolio by risk-rating grades |  |
Total | 103,181 | 128,806
Purchased loans | Real estate – 1-4 family mortgage | Pass |  |
Loan portfolio by risk-rating grades |  |
Total | 91,968 | 113,874
Purchased loans | Real estate – 1-4 family mortgage | Watch |  |
Loan portfolio by risk-rating grades |  |
Total | 4,979 | 7,347
Purchased loans | Real estate – 1-4 family mortgage | Substandard |  |
Loan portfolio by risk-rating grades |  |
Total | 6,234 | 7,585
Purchased loans | Real estate – commercial mortgage |  |
Loan portfolio by risk-rating grades |  |
Total | 1,276,567 | 1,423,144
Purchased loans | Real estate – commercial mortgage | Internal Noninvestment Grade |  |
Loan portfolio by risk-rating grades |  |
Total | 1,125,314 | 1,251,570
Purchased loans | Real estate – commercial mortgage | Pass |  |
Loan portfolio by risk-rating grades |  |
Total | 1,048,170 | 1,198,540
Purchased loans | Real estate – commercial mortgage | Watch |  |
Loan portfolio by risk-rating grades |  |
Total | 63,602 | 43,046
Purchased loans | Real estate – commercial mortgage | Substandard |  |
Loan portfolio by risk-rating grades |  |
Total | 13,542 | 9,984
Purchased loans | Installment loans to individuals |  |
Loan portfolio by risk-rating grades |  |
Total | 29,064 | 37,408
Purchased loans | Installment loans to individuals | Internal Noninvestment Grade |  |
Loan portfolio by risk-rating grades |  |
Total | 1 | 2
Purchased loans | Installment loans to individuals | Pass |  |
Loan portfolio by risk-rating grades |  |
Total | 0 | 0
Purchased loans | Installment loans to individuals | Watch |  |
Loan portfolio by risk-rating grades |  |
Total | 0 | 0
Purchased loans | Installment loans to individuals | Substandard |  |
Loan portfolio by risk-rating grades |  |
Total | $ 1 | $ 2

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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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