Allowance for Loan and Lease Losses (Note Restructurings During Period) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($) loans	Mar. 31, 2017 USD ($) loans
Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	118	99
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 8,778	$ 6,434
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	72	42
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 3,664	$ 4,207
Non-PCI Loans | Loan term extension
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	6	5
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 932	$ 140
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	1	2
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 305	$ 577
Non-PCI Loans | Loan term extension | Commercial | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	1	0
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 305	$ 0
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	1	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 305	$ 0
Non-PCI Loans | Loan term extension | Commercial | Other commercial real estate
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	0	0
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 0	$ 0
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 0	$ 530
Non-PCI Loans | Loan term extension | Commercial | Commercial and industrial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	3	2
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 549	$ 94
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 0	$ 0
Non-PCI Loans | Loan term extension | Noncommercial | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	0	1
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 0	$ 32
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 0	$ 47
Non-PCI Loans | Loan term extension | Noncommercial | Revolving mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	1	0
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 57	$ 0
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 0	$ 0
Non-PCI Loans | Loan term extension | Noncommercial | Consumer
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	1	2
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 21	$ 14
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 0	$ 0
Non-PCI Loans | Below market interest rate
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	66	53
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 5,660	$ 5,635
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	30	19
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 1,814	$ 1,685
Non-PCI Loans | Below market interest rate | Commercial | Construction and land development
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	0	1
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 0	$ 60
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 0	$ 0
Non-PCI Loans | Below market interest rate | Commercial | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	6	10
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 1,380	$ 2,512
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	2	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 47	$ 92
Non-PCI Loans | Below market interest rate | Commercial | Other commercial real estate
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	0	1
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 0	$ 4
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 0	$ 0
Non-PCI Loans | Below market interest rate | Commercial | Commercial and industrial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	8	3
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 361	$ 108
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	4	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 11	$ 0
Non-PCI Loans | Below market interest rate | Commercial | Lease financing
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	0	3
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 0	$ 839
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	2
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 0	$ 769
Non-PCI Loans | Below market interest rate | Noncommercial | Construction and land development
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	0	2
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 0	$ 412
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 0	$ 0
Non-PCI Loans | Below market interest rate | Noncommercial | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	22	30
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 2,189	$ 1,543
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	10	15
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 1,277	$ 824
Non-PCI Loans | Below market interest rate | Noncommercial | Revolving mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	25	0
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 1,659	$ 0
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	11	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 431	$ 0
Non-PCI Loans | Below market interest rate | Noncommercial | Consumer
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	5	2
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 71	$ 14
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	3	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 48	$ 0
Non-PCI Loans | Below market interest rate | Noncommercial | Other
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	0	1
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 0	$ 143
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 0	$ 0
Non-PCI Loans | Discharged from bankruptcy
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	46	41
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 2,186	$ 659
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	41	21
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 1,545	$ 1,945
Non-PCI Loans | Discharged from bankruptcy | Commercial | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	1	0
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 140	$ 0
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	2	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 502	$ 190
Non-PCI Loans | Discharged from bankruptcy | Commercial | Commercial and industrial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	14	0
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 474	$ 0
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	16	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 177	$ 0
Non-PCI Loans | Discharged from bankruptcy | Commercial | Lease financing
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	5	16
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 304	$ 227
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	2	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 73	$ 0
Non-PCI Loans | Discharged from bankruptcy | Noncommercial | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	8	3
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 566	$ 140
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	6	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 417	$ 978
Non-PCI Loans | Discharged from bankruptcy | Noncommercial | Revolving mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	5	4
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 440	$ 99
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	4	9
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 193	$ 649
Non-PCI Loans | Discharged from bankruptcy | Noncommercial | Consumer
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	13	18
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 262	$ 193
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	11	10
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 183	$ 128
PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	3	2
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 2,271	$ 181
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	2	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 1,627	$ 73
PCI Loans | Interest only period provided
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	1	0
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 644	$ 0
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 0	$ 0
PCI Loans | Interest only period provided | Commercial | Commercial and industrial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	1	0
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 644	$ 0
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 0	$ 0
PCI Loans | Below market interest rate
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	0	2
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 0	$ 181
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 0	$ 73
PCI Loans | Below market interest rate | Noncommercial | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	0	2
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 0	$ 181
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 0	$ 73
PCI Loans | Discharged from bankruptcy
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	2	0
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 1,627	$ 0
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	2	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 1,627	$ 0
PCI Loans | Discharged from bankruptcy | Noncommercial | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	2	0
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 1,627	$ 0
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	2	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 1,627	$ 0