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Loans (Recorded Investment By Loan Grade) (Details) - USD ($) | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loans and Leases Receivable, Recorded Investment |  | $ 7,226,312,000 | $ 6,520,625,000
Recorded Investment |  | 7,204,445,000 | 6,501,404,000
Construction Real Estate Commercial [Domain] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loans and Leases Receivable, Recorded Investment |  | 246,131,000 | 234,463,000
Recorded Investment |  | 245,339,000 | 233,637,000
Residential Real Estate Commercial [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loans and Leases Receivable, Recorded Investment |  | 500,008,000 | 480,420,000
Recorded Investment |  | 498,697,000 | 479,081,000
Commercial Real Estate [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loans and Leases Receivable, Recorded Investment | [1] | 1,639,455,000 | 1,614,984,000
Recorded Investment | [1] | 1,632,625,000 | 1,609,413,000
Finance Leases Portfolio Segment [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loans and Leases Receivable, Recorded Investment |  | 28,845,000 | 30,101,000
Recorded Investment |  | 28,832,000 | 30,081,000
5 Rated [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total ending loan balance, recorded investment |  | 75,429,000 | 27,473,000
5 Rated [Member] | Construction Real Estate Commercial [Domain] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total ending loan balance, recorded investment |  |  | 4,857,000
5 Rated [Member] | Residential Real Estate Commercial [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total ending loan balance, recorded investment |  | 542,000 | 3,839,000
5 Rated [Member] | Commercial, Financial, and Agricultural [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total ending loan balance, recorded investment |  | 11,216,000 | 11,981,000
5 Rated [Member] | Commercial Real Estate [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total ending loan balance, recorded investment |  | 63,235,000 | 6,796,000
5 Rated [Member] | Finance Leases Portfolio Segment [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total ending loan balance, recorded investment |  | 436,000 | 0
6 Rated [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total ending loan balance, recorded investment |  | 138,000 | 979,000
6 Rated [Member] | Construction Real Estate Commercial [Domain] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total ending loan balance, recorded investment |  |  | 1,000
6 Rated [Member] | Residential Real Estate Commercial [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total ending loan balance, recorded investment |  | 25,000 | 30,000
6 Rated [Member] | Commercial, Financial, and Agricultural [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total ending loan balance, recorded investment |  |  | 3,000
6 Rated [Member] | Commercial Real Estate [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total ending loan balance, recorded investment |  | 113,000 | 945,000
6 Rated [Member] | Finance Leases Portfolio Segment [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total ending loan balance, recorded investment |  | 0 | 0
Impaired [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total ending loan balance, recorded investment |  | 91,794,000 | 77,528,000
Impaired [Member] | Construction Real Estate Commercial [Domain] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total ending loan balance, recorded investment |  | 631,000 | 453,000
Impaired [Member] | Residential Real Estate Commercial [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total ending loan balance, recorded investment |  | 5,257,000 | 2,025,000
Impaired [Member] | Commercial, Financial, and Agricultural [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total ending loan balance, recorded investment |  | 30,194,000 | 33,125,000
Impaired [Member] | Commercial Real Estate [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total ending loan balance, recorded investment |  | 54,071,000 | 41,791,000
Impaired [Member] | Finance Leases Portfolio Segment [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total ending loan balance, recorded investment |  | 1,641,000 | 134,000
Purchased credit impaired [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total ending loan balance, recorded investment |  | 11,718,000 | 13,469,000
Purchased credit impaired [Member] | Construction Real Estate Commercial [Domain] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total ending loan balance, recorded investment |  | 1,022,000 | 1,044,000
Purchased credit impaired [Member] | Residential Real Estate Commercial [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total ending loan balance, recorded investment |  | 1,556,000 | 1,754,000
Purchased credit impaired [Member] | Finance Leases Portfolio Segment [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total ending loan balance, recorded investment |  | 140,000 | 523,000
Purchased credit impaired [Member] | Commercial, Financial, and Agricultural [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total ending loan balance, recorded investment |  | 453,000 | 966,000
Purchased credit impaired [Member] | Commercial Real Estate [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total ending loan balance, recorded investment |  | 8,547,000 | 9,182,000
Pass Rated [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total ending loan balance, recorded investment |  | 3,977,369,000 | 3,430,022,000
Pass Rated [Member] | Construction Real Estate Commercial [Domain] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total ending loan balance, recorded investment |  | 244,478,000 | 228,108,000
Pass Rated [Member] | Residential Real Estate Commercial [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total ending loan balance, recorded investment |  | 492,628,000 | 472,772,000
Pass Rated [Member] | Commercial, Financial, and Agricultural [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total ending loan balance, recorded investment |  | 1,700,146,000 | 1,143,428,000
Pass Rated [Member] | Commercial Real Estate [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total ending loan balance, recorded investment |  | 1,513,489,000 | 1,556,270,000
Pass Rated [Member] | Finance Leases Portfolio Segment [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total ending loan balance, recorded investment |  | 26,628,000 | 29,444,000
Recorded Investment [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Recorded Investment |  | 4,156,448,000 | 3,549,471,000
Recorded Investment [Member] | Construction Real Estate Commercial [Domain] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Recorded Investment |  | 246,131,000 | 234,463,000
Recorded Investment [Member] | Residential Real Estate Commercial [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Recorded Investment |  | 500,008,000 | 480,420,000
Recorded Investment [Member] | Commercial, Financial, and Agricultural [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Recorded Investment |  | 1,742,009,000 | 1,189,503,000
Recorded Investment [Member] | Commercial Real Estate [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Recorded Investment |  | 1,639,455,000 | 1,614,984,000
Recorded Investment [Member] | Finance Leases Portfolio Segment [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Recorded Investment |  | $ 28,845,000 | 30,101,000
Financial Asset Acquired with Credit Deterioration [Member] | Nonperforming Financial Instruments [Member] | Purchased credit impaired [Member] | Commercial Portfolio Segment [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loans and Leases Receivable, Recorded Investment |  |  | 6,000
Total ending loan balance, recorded investment |  |  | $ 5,000
[1] | Included within each of commercial, financial and agricultural loans and commercial real estate loans is an immaterial amount of consumer loans that are not broken out by class.

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