Loans and Allowance for Credit Losses Allowance for Loan Losses by Portfolio Segment (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning Balance	$ 160,537	$ 169,910
Loans and leases charged off	(6,369)	(6,397)
Recoveries of loans and leases previously charged off	2,231	2,362
Net loans and leases charged off	(4,138)	(4,035)
Provision for loan losses	5,710	(2,658)
Ending Balance	162,109	163,217
Provision for loan losses gross	(610)	6,600
Provision for credit losses	5,100	3,970
Real-estate - commercial mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning Balance	52,889	58,793
Loans and leases charged off	(1,145)	(267)
Recoveries of loans and leases previously charged off	136	279
Net loans and leases charged off	(1,009)	12
Provision for loan losses	66	(88)
Ending Balance	51,946	58,717
Commercial - industrial, financial and agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning Balance	58,868	66,280
Loans and leases charged off	(2,787)	(4,005)
Recoveries of loans and leases previously charged off	1,243	1,075
Net loans and leases charged off	(1,544)	(2,930)
Provision for loan losses	3,177	(1,520)
Ending Balance	60,501	61,830
Real-estate - home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning Balance	18,911	18,127
Loans and leases charged off	(219)	(408)
Recoveries of loans and leases previously charged off	197	206
Net loans and leases charged off	(22)	(202)
Provision for loan losses	326	(397)
Ending Balance	19,215	17,528
Real estate - residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning Balance	18,921	16,088
Loans and leases charged off	(655)	(162)
Recoveries of loans and leases previously charged off	132	107
Net loans and leases charged off	(523)	(55)
Provision for loan losses	748	(772)
Ending Balance	19,146	15,261
Real estate - construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning Balance	5,061	6,620
Loans and leases charged off	(95)	(158)
Recoveries of loans and leases previously charged off	84	306
Net loans and leases charged off	(11)	148
Provision for loan losses	(109)	(844)
Ending Balance	4,941	5,924
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning Balance	3,217	2,045
Loans and leases charged off	(683)	(892)
Recoveries of loans and leases previously charged off	210	179
Net loans and leases charged off	(473)	(713)
Provision for loan losses	575	571
Ending Balance	3,319	1,903
Equipment lease financing, other and overdrafts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning Balance	2,670	1,957
Loans and leases charged off	(785)	(505)
Recoveries of loans and leases previously charged off	229	210
Net loans and leases charged off	(556)	(295)
Provision for loan losses	927	392
Ending Balance	$ 3,041	$ 2,054

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

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