Loans and Allowance for Credit Losses Allowance for Loan Losses by Portfolio Segment (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Allowance, Beginning Balance	$ 169,910	$ 168,679
Loans charged off	(66,076)	(33,290)	$ (33,927)
Recoveries of loans previously charged off	12,495	14,744	20,658
Loans Charged Off, Net Of Recoveries	(53,581)	(18,546)	(13,269)
Provision for loan losses	44,208	19,777
Financing receivable, allowance for credit losses, collectively evaluated for impairment	120,205	128,389
Financing receivable, allowance for credit losses, individually evaluated for impairment	40,332	41,521
Loans and Leases Receivable, Allowance, Ending Balance	160,537	169,910	168,679
Measured for impairment under FASB ASC Subtopic 450-20	15,975,622	15,577,118
Evaluated for impairment under FASB ASC Section 310-10-35	190,178	191,129
Loans, net of unearned income	16,165,800	15,768,247
Change in provision allocated to commitments to lend to borrowers	2,699	3,500
Provision for credit losses	46,907	23,305	13,182
Real estate – commercial mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Allowance, Beginning Balance	58,793	46,842
Loans charged off	(2,045)	(2,169)
Recoveries of loans previously charged off	1,622	1,668
Loans Charged Off, Net Of Recoveries	(423)	(501)
Provision for loan losses	(5,481)	12,452
Financing receivable, allowance for credit losses, collectively evaluated for impairment	45,634	50,681
Financing receivable, allowance for credit losses, individually evaluated for impairment	7,255	8,112
Loans and Leases Receivable, Allowance, Ending Balance	52,889	58,793	46,842
Measured for impairment under FASB ASC Subtopic 450-20	6,388,212	6,316,023
Evaluated for impairment under FASB ASC Section 310-10-35	46,073	48,781
Loans, net of unearned income	6,434,285	6,364,804
Commercial – industrial, financial and agricultural
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Allowance, Beginning Balance	66,280	54,353
Loans charged off	(52,441)	(19,067)
Recoveries of loans previously charged off	4,994	7,771
Loans Charged Off, Net Of Recoveries	(47,447)	(11,296)
Provision for loan losses	40,035	23,223
Financing receivable, allowance for credit losses, collectively evaluated for impairment	46,355	54,874
Financing receivable, allowance for credit losses, individually evaluated for impairment	12,513	11,406
Loans and Leases Receivable, Allowance, Ending Balance	58,868	66,280	54,353
Measured for impairment under FASB ASC Subtopic 450-20	4,349,255	4,236,572
Evaluated for impairment under FASB ASC Section 310-10-35	55,293	63,725
Loans, net of unearned income	4,404,548	4,300,297
Real estate – home equity
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Allowance, Beginning Balance	18,127	26,801
Loans charged off	(3,087)	(2,340)
Recoveries of loans previously charged off	1,127	813
Loans Charged Off, Net Of Recoveries	(1,960)	(1,527)
Provision for loan losses	2,744	(7,147)
Financing receivable, allowance for credit losses, collectively evaluated for impairment	8,541	7,003
Financing receivable, allowance for credit losses, individually evaluated for impairment	10,370	11,124
Loans and Leases Receivable, Allowance, Ending Balance	18,911	18,127	26,801
Measured for impairment under FASB ASC Subtopic 450-20	1,428,764	1,535,026
Evaluated for impairment under FASB ASC Section 310-10-35	23,373	24,693
Loans, net of unearned income	1,452,137	1,559,719
Real estate – residential mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Allowance, Beginning Balance	16,088	22,929
Loans charged off	(1,574)	(687)
Recoveries of loans previously charged off	620	786
Loans Charged Off, Net Of Recoveries	(954)	99
Provision for loan losses	3,787	(6,940)
Financing receivable, allowance for credit losses, collectively evaluated for impairment	9,527	6,193
Financing receivable, allowance for credit losses, individually evaluated for impairment	9,394	9,895
Loans and Leases Receivable, Allowance, Ending Balance	18,921	16,088	22,929
Measured for impairment under FASB ASC Subtopic 450-20	2,212,274	1,913,004
Evaluated for impairment under FASB ASC Section 310-10-35	38,770	41,707
Loans, net of unearned income	2,251,044	1,954,711
Real estate – construction
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Allowance, Beginning Balance	6,620	6,455
Loans charged off	(1,368)	(3,765)
Recoveries of loans previously charged off	1,829	1,582
Loans Charged Off, Net Of Recoveries	461	(2,183)
Provision for loan losses	(2,020)	2,348
Financing receivable, allowance for credit losses, collectively evaluated for impairment	4,268	5,653
Financing receivable, allowance for credit losses, individually evaluated for impairment	793	967
Loans and Leases Receivable, Allowance, Ending Balance	5,061	6,620	6,455
Measured for impairment under FASB ASC Subtopic 450-20	909,209	994,738
Evaluated for impairment under FASB ASC Section 310-10-35	7,390	12,197
Loans, net of unearned income	916,599	1,006,935
Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Allowance, Beginning Balance	2,045	3,574
Loans charged off	(3,040)	(2,227)
Recoveries of loans previously charged off	1,266	1,156
Loans Charged Off, Net Of Recoveries	(1,774)	(1,071)
Provision for loan losses	2,946	(458)
Financing receivable, allowance for credit losses, collectively evaluated for impairment	3,210	2,028
Financing receivable, allowance for credit losses, individually evaluated for impairment	7	17
Loans and Leases Receivable, Allowance, Ending Balance	3,217	2,045	3,574
Measured for impairment under FASB ASC Subtopic 450-20	419,175	313,757
Evaluated for impairment under FASB ASC Section 310-10-35	11	26
Loans, net of unearned income	419,186	313,783
Leasing and other and overdrafts
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Allowance, Beginning Balance	1,957	3,192
Loans charged off	(2,521)	(3,035)
Recoveries of loans previously charged off	1,037	968
Loans Charged Off, Net Of Recoveries	(1,484)	(2,067)
Provision for loan losses	2,197	832
Financing receivable, allowance for credit losses, collectively evaluated for impairment	2,670	1,957
Financing receivable, allowance for credit losses, individually evaluated for impairment	0	0
Loans and Leases Receivable, Allowance, Ending Balance	2,670	1,957	3,192
Measured for impairment under FASB ASC Subtopic 450-20	268,733	267,998
Evaluated for impairment under FASB ASC Section 310-10-35	19,268	0
Loans, net of unearned income	288,001	267,998
Unallocated
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Allowance, Beginning Balance	0	4,533
Loans charged off	0	0
Recoveries of loans previously charged off		0
Loans Charged Off, Net Of Recoveries	0	0
Provision for loan losses	0	(4,533)
Financing receivable, allowance for credit losses, collectively evaluated for impairment	0	0
Loans and Leases Receivable, Allowance, Ending Balance	$ 0	$ 0	$ 4,533

Allowance for loan and lease losses, provision for loss, net of provision applied to unfunded commitments.

No definition available.

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- Definition

Reflects the increase in the allowance account attributable to collections of loans and lease receivables which had previously been fully or partially charged off as bad debts.

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Represents the change in allocation needs for commitments to lend to borrowers.

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Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts.

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Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

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The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

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Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The balance of financing receivables that were collectively evaluated for impairment.

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- Definition

Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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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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Amount of expense related to estimated loss from loan and lease transactions.

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