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Loans (Recorded Investment By Loan Grade) (Details) - USD ($) | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loans and Leases Receivable, Recorded Investment |  | $ 6,541,548,000 | $ 6,520,625,000
Recorded Investment |  | 6,522,519,000 | 6,501,404,000
Construction Real Estate Commercial [Domain] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loans and Leases Receivable, Recorded Investment |  | 233,049,000 | 234,463,000
Recorded Investment |  | 232,327,000 | 233,637,000
Residential Real Estate Commercial [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loans and Leases Receivable, Recorded Investment |  | 467,189,000 | 480,420,000
Recorded Investment |  | 466,002,000 | 479,081,000
Commercial Real Estate [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loans and Leases Receivable, Recorded Investment | [1] | 1,633,043,000 | 1,614,984,000
Recorded Investment | [1] | 1,627,426,000 | 1,609,413,000
Finance Leases Portfolio Segment [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Loans and Leases Receivable, Recorded Investment |  | 28,909,000 | 30,101,000
Recorded Investment |  | 28,892,000 | 30,081,000
5 Rated [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total ending loan balance, recorded investment |  | 26,689,000 | 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 | 4,857,000
5 Rated [Member] | Residential Real Estate Commercial [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total ending loan balance, recorded investment |  | 549,000 | 3,839,000
5 Rated [Member] | Commercial, Financial, and Agricultural [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total ending loan balance, recorded investment |  | 11,490,000 | 11,981,000
5 Rated [Member] | Commercial Real Estate [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total ending loan balance, recorded investment |  | 9,793,000 | 6,796,000
5 Rated [Member] | Finance Leases Portfolio Segment [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total ending loan balance, recorded investment |  | 0 | 0
6 Rated [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total ending loan balance, recorded investment |  | 212,000 | 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 |  | 26,000 | 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 |  | 186,000 | 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 |  | 85,863,000 | 77,528,000
Impaired [Member] | Construction Real Estate Commercial [Domain] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total ending loan balance, recorded investment |  | 452,000 | 453,000
Impaired [Member] | Residential Real Estate Commercial [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total ending loan balance, recorded investment |  | 5,581,000 | 2,025,000
Impaired [Member] | Commercial, Financial, and Agricultural [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total ending loan balance, recorded investment |  | 29,554,000 | 33,125,000
Impaired [Member] | Commercial Real Estate [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total ending loan balance, recorded investment |  | 50,147,000 | 41,791,000
Impaired [Member] | Finance Leases Portfolio Segment [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total ending loan balance, recorded investment |  | 129,000 | 134,000
Purchased credit impaired [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total ending loan balance, recorded investment |  | 12,912,000 | 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 |  | 1,032,000 | 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 |  | 1,583,000 | 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 |  | 340,000 | 523,000
Purchased credit impaired [Member] | Commercial, Financial, and Agricultural [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total ending loan balance, recorded investment |  | 620,000 | 966,000
Purchased credit impaired [Member] | Commercial Real Estate [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total ending loan balance, recorded investment |  | 9,337,000 | 9,182,000
Pass Rated [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total ending loan balance, recorded investment |  | 3,443,948,000 | 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 |  | 226,708,000 | 228,108,000
Pass Rated [Member] | Residential Real Estate Commercial [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total ending loan balance, recorded investment |  | 459,450,000 | 472,772,000
Pass Rated [Member] | Commercial, Financial, and Agricultural [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total ending loan balance, recorded investment |  | 1,165,770,000 | 1,143,428,000
Pass Rated [Member] | Commercial Real Estate [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total ending loan balance, recorded investment |  | 1,563,580,000 | 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 |  | 28,440,000 | 29,444,000
Recorded Investment [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Recorded Investment |  | 3,569,624,000 | 3,549,471,000
Recorded Investment [Member] | Construction Real Estate Commercial [Domain] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Recorded Investment |  | 233,049,000 | 234,463,000
Recorded Investment [Member] | Residential Real Estate Commercial [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Recorded Investment |  | 467,189,000 | 480,420,000
Recorded Investment [Member] | Commercial, Financial, and Agricultural [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Recorded Investment |  | 1,207,434,000 | 1,189,503,000
Recorded Investment [Member] | Commercial Real Estate [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Recorded Investment |  | 1,633,043,000 | 1,614,984,000
Recorded Investment [Member] | Finance Leases Portfolio Segment [Member] |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Recorded Investment |  | $ 28,909,000 | 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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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. 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=121593590&loc=d3e4428-111522 + Details
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