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Loans (Recorded Investment By Loan Grade) (Details) - USD ($)		Sep. 30, 2020	Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Recorded Investment		$ 7,301,181,000	$ 6,520,625,000
Recorded Investment		7,278,546,000	6,501,404,000
Construction Real Estate Commercial [Domain]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Recorded Investment		245,998,000	234,463,000
Recorded Investment		245,288,000	233,637,000
Residential Real Estate Commercial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Recorded Investment		502,781,000	480,420,000
Recorded Investment		501,608,000	479,081,000
Commercial Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Recorded Investment	[1]	1,696,288,000	1,614,984,000
Recorded Investment	[1]	1,689,477,000	1,609,413,000
Finance Leases Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Recorded Investment		27,532,000	30,101,000
Recorded Investment		27,510,000	30,081,000
5 Rated [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total ending loan balance, recorded investment		104,411,000	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		353,000	3,839,000
5 Rated [Member] | Commercial, Financial, and Agricultural [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total ending loan balance, recorded investment		15,091,000	11,981,000
5 Rated [Member] | Commercial Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total ending loan balance, recorded investment		88,618,000	6,796,000
5 Rated [Member] | Finance Leases Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total ending loan balance, recorded investment		349,000	0
6 Rated [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total ending loan balance, recorded investment		1,144,000	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		24,000	30,000
6 Rated [Member] | Commercial, Financial, and Agricultural [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total ending loan balance, recorded investment		60,000	3,000
6 Rated [Member] | Commercial Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total ending loan balance, recorded investment		1,060,000	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		116,180,000	77,528,000
Impaired [Member] | Construction Real Estate Commercial [Domain]
Financing Receivable, Credit Quality Indicator [Line Items]
Total ending loan balance, recorded investment		3,142,000	453,000
Impaired [Member] | Residential Real Estate Commercial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total ending loan balance, recorded investment		4,897,000	2,025,000
Impaired [Member] | Commercial, Financial, and Agricultural [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total ending loan balance, recorded investment		33,098,000	33,125,000
Impaired [Member] | Commercial Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total ending loan balance, recorded investment		72,519,000	41,791,000
Impaired [Member] | Finance Leases Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total ending loan balance, recorded investment		2,524,000	134,000
Purchased credit impaired [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total ending loan balance, recorded investment		11,128,000	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		1,012,000	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		1,530,000	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		127,000	523,000
Purchased credit impaired [Member] | Commercial, Financial, and Agricultural [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total ending loan balance, recorded investment		375,000	966,000
Purchased credit impaired [Member] | Commercial Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total ending loan balance, recorded investment		8,084,000	9,182,000
Pass Rated [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total ending loan balance, recorded investment		3,973,686,000	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		241,844,000	228,108,000
Pass Rated [Member] | Residential Real Estate Commercial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total ending loan balance, recorded investment		495,977,000	472,772,000
Pass Rated [Member] | Commercial, Financial, and Agricultural [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total ending loan balance, recorded investment		1,685,326,000	1,143,428,000
Pass Rated [Member] | Commercial Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total ending loan balance, recorded investment		1,526,007,000	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		24,532,000	29,444,000
Recorded Investment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Recorded Investment		4,206,549,000	3,549,471,000
Recorded Investment [Member] | Construction Real Estate Commercial [Domain]
Financing Receivable, Credit Quality Indicator [Line Items]
Recorded Investment		245,998,000	234,463,000
Recorded Investment [Member] | Residential Real Estate Commercial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Recorded Investment		502,781,000	480,420,000
Recorded Investment [Member] | Commercial, Financial, and Agricultural [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Recorded Investment		1,733,950,000	1,189,503,000
Recorded Investment [Member] | Commercial Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Recorded Investment		1,696,288,000	1,614,984,000
Recorded Investment [Member] | Finance Leases Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Recorded Investment		$ 27,532,000	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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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
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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.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 310
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-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522

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