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Loans Recorded investment by loan grade (Details) - USD ($) | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Financing Receivable, Impaired [Line Items] |  |  |
Total loans | $ 6,501,404,000 | $ 5,692,132,000 | $ 5,372,483,000
Loans and Leases Receivable, Recorded Investment | 6,520,625,000 | 5,709,798,000 |
Five Rated [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total loans | 27,473,000 | 16,048,000 |
Six Rated [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total loans | 979,000 | 485,000 |
Impaired [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total loans | 77,528,000 | 48,218,000 |
Purchased credit impaired [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total loans | 13,469,000 | 3,961,000 |
Pass [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total loans | 3,430,022,000 | 2,905,752,000 |
Recorded Investment [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total loans | 3,549,471,000 | 2,974,464,000 |
Commercial Financial And Agricultural [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Loans and Leases Receivable, Recorded Investment | 1,189,503,000 | 1,077,389,000 |
Commercial Financial And Agricultural [Member] | Five Rated [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total loans | 11,981,000 | 11,509,000 |
Commercial Financial And Agricultural [Member] | Six Rated [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total loans | 3,000 | 444,000 |
Commercial Financial And Agricultural [Member] | Impaired [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total loans | 33,125,000 | 15,194,000 |
Commercial Financial And Agricultural [Member] | Purchased credit impaired [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total loans | 966,000 | 148,000 |
Commercial Financial And Agricultural [Member] | Pass [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total loans | 1,143,428,000 | 1,050,094,000 |
Commercial Financial And Agricultural [Member] | Recorded Investment [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total loans | 1,189,503,000 | 1,077,389,000 |
Commercial Real Estate Portfolio Segment [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Loans and Leases Receivable, Recorded Investment | 1,614,984,000 | 1,287,795,000 |
Commercial Real Estate Portfolio Segment [Member] | Five Rated [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total loans | 6,796,000 | 2,707,000 |
Commercial Real Estate Portfolio Segment [Member] | Six Rated [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total loans | 945,000 |  |
Commercial Real Estate Portfolio Segment [Member] | Impaired [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total loans | 41,791,000 | 28,426,000 |
Commercial Real Estate Portfolio Segment [Member] | Purchased credit impaired [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total loans | 9,182,000 | 3,059,000 |
Commercial Real Estate Portfolio Segment [Member] | Pass [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total loans | 1,556,270,000 | 1,253,603,000 |
Commercial Real Estate Portfolio Segment [Member] | Recorded Investment [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total loans | 1,614,984,000 | 1,287,795,000 |
Construction Real Estate Remaining Commercial [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Loans and Leases Receivable, Recorded Investment | 234,463,000 | 176,101,000 |
Construction Real Estate Remaining Commercial [Member] | Five Rated [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total loans | 4,857,000 | 1,560,000 |
Construction Real Estate Remaining Commercial [Member] | Six Rated [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total loans | 1,000 |  |
Construction Real Estate Remaining Commercial [Member] | Impaired [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total loans | 453,000 | 1,866,000 |
Construction Real Estate Remaining Commercial [Member] | Purchased credit impaired [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total loans | 1,044,000 | 503,000 |
Construction Real Estate Remaining Commercial [Member] | Pass [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total loans | 228,108,000 | 172,172,000 |
Construction Real Estate Remaining Commercial [Member] | Recorded Investment [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total loans | 234,463,000 | 176,101,000 |
Residential Real Estate Commercial [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Loans and Leases Receivable, Recorded Investment | 480,420,000 | 430,880,000 |
Residential Real Estate Commercial [Member] | Five Rated [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total loans | 3,839,000 | 272,000 |
Residential Real Estate Commercial [Member] | Six Rated [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total loans | 30,000 | 41,000 |
Residential Real Estate Commercial [Member] | Impaired [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total loans | 2,025,000 | 2,732,000 |
Residential Real Estate Commercial [Member] | Purchased credit impaired [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total loans | 1,754,000 | 251,000 |
Residential Real Estate Commercial [Member] | Pass [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total loans | 472,772,000 | 427,584,000 |
Residential Real Estate Commercial [Member] | Recorded Investment [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total loans | 480,420,000 | 430,880,000 |
Leases |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Loans and Leases Receivable, Recorded Investment | 30,101,000 | 2,299,000 |
Leases | Impaired [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total loans | 134,000 |  |
Leases | Purchased credit impaired [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total loans | 523,000 | 0 |
Leases | Pass [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total loans | 29,444,000 | 2,299,000 |
Leases | Recorded Investment [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total loans | 30,101,000 | 2,299,000 |
Commercial Portfolio Segment [Member] | Purchased credit impaired [Member] | Financial Asset Acquired with Credit Deterioration [Member] | Nonperforming Financial Instruments [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total loans | 5,000 | 475,000 |
Loans and Leases Receivable, Recorded Investment | $ 6,000 | $ 475,000 |

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