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Purchased Loans - Loan Portfolio by Risk-rating Grades (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Loan portfolio by risk-rating grades |  |
Total | $ 7,620,322 | $ 6,202,709
Commercial, financial, agricultural |  |
Loan portfolio by risk-rating grades |  |
Total | 1,039,393 | 717,490
Real estate – construction |  |
Loan portfolio by risk-rating grades |  |
Total | 633,389 | 552,679
Real estate – 1-4 family mortgage |  |
Loan portfolio by risk-rating grades |  |
Total | 2,343,721 | 1,878,177
Real estate – commercial mortgage |  |
Loan portfolio by risk-rating grades |  |
Total | 3,427,530 | 2,898,895
Installment loans to individuals |  |
Loan portfolio by risk-rating grades |  |
Total | 176,289 | 155,468
Purchased |  |
Loan portfolio by risk-rating grades |  |
Total | 2,031,766 | 1,489,137
Purchased | Internal Noninvestment Grade |  |
Loan portfolio by risk-rating grades |  |
Total | 1,284,431 | 901,252
Purchased | Pass |  |
Loan portfolio by risk-rating grades |  |
Total | 1,266,429 | 877,440
Purchased | Watch |  |
Loan portfolio by risk-rating grades |  |
Total | 15,326 | 21,120
Purchased | Substandard |  |
Loan portfolio by risk-rating grades |  |
Total | 2,676 | 2,692
Purchased | Commercial, financial, agricultural | Internal Noninvestment Grade |  |
Loan portfolio by risk-rating grades |  |
Total | 248,993 | 106,638
Purchased | Commercial, financial, agricultural | Pass |  |
Loan portfolio by risk-rating grades |  |
Total | 246,169 | 102,777
Purchased | Commercial, financial, agricultural | Watch |  |
Loan portfolio by risk-rating grades |  |
Total | 2,226 | 2,370
Purchased | Commercial, financial, agricultural | Substandard |  |
Loan portfolio by risk-rating grades |  |
Total | 598 | 1,491
Purchased | Real estate – construction | Internal Noninvestment Grade |  |
Loan portfolio by risk-rating grades |  |
Total | 81,220 | 63,846
Purchased | Real estate – construction | Pass |  |
Loan portfolio by risk-rating grades |  |
Total | 81,220 | 61,206
Purchased | Real estate – construction | Watch |  |
Loan portfolio by risk-rating grades |  |
Total | 0 | 2,640
Purchased | Real estate – construction | Substandard |  |
Loan portfolio by risk-rating grades |  |
Total | 0 | 0
Purchased | Real estate – 1-4 family mortgage | Internal Noninvestment Grade |  |
Loan portfolio by risk-rating grades |  |
Total | 100,039 | 113,294
Purchased | Real estate – 1-4 family mortgage | Pass |  |
Loan portfolio by risk-rating grades |  |
Total | 93,867 | 105,265
Purchased | Real estate – 1-4 family mortgage | Watch |  |
Loan portfolio by risk-rating grades |  |
Total | 5,924 | 7,665
Purchased | Real estate – 1-4 family mortgage | Substandard |  |
Loan portfolio by risk-rating grades |  |
Total | 248 | 364
Purchased | Real estate – commercial mortgage | Internal Noninvestment Grade |  |
Loan portfolio by risk-rating grades |  |
Total | 853,498 | 617,360
Purchased | Real estate – commercial mortgage | Pass |  |
Loan portfolio by risk-rating grades |  |
Total | 844,495 | 608,192
Purchased | Real estate – commercial mortgage | Watch |  |
Loan portfolio by risk-rating grades |  |
Total | 7,176 | 8,445
Purchased | Real estate – commercial mortgage | Substandard |  |
Loan portfolio by risk-rating grades |  |
Total | 1,827 | 723
Purchased | Installment loans to individuals | Internal Noninvestment Grade |  |
Loan portfolio by risk-rating grades |  |
Total | 681 | 114
Purchased | Installment loans to individuals | Pass |  |
Loan portfolio by risk-rating grades |  |
Total | 678 | 0
Purchased | Installment loans to individuals | Watch |  |
Loan portfolio by risk-rating grades |  |
Total | 0 | 0
Purchased | Installment loans to individuals | Substandard |  |
Loan portfolio by risk-rating grades |  |
Total | $ 3 | $ 114

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524 + Details
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