Allowance for Loan and Lease Losses (Note Restructurings During Period) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) loans	Dec. 31, 2016 USD ($) loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	$ 164,561	$ 150,916
Commercial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	95,392	101,858
Commercial | Construction and land development
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	4,572	3,600
Commercial | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	78,221	84,698
Commercial | Other commercial real estate
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	1,800	1,715
Commercial | Commercial and industrial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	8,508	10,629
Commercial | Lease financing
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	1,770	1,074
Commercial | Other
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	521	142
Noncommercial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	69,169	49,058
Noncommercial | Construction and land development
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	0	240
Noncommercial | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	43,542	39,129
Noncommercial | Revolving mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	22,853	7,777
Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	$ 146,126	$ 124,547
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	200	143
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 10,836	$ 7,558
Financing Receivable, Modifications, Number of Contracts | loans	617	503
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 46,374	$ 41,031
PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	$ 18,435	$ 26,369
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	4	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 1,154	$ 3
Financing Receivable, Modifications, Number of Contracts | loans	15	10
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 2,626	$ 6,444
Principal Forgiveness [Member] | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	2
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 448
Financing Receivable, Modifications, Number of Contracts | loans	5	3
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 572	$ 691
Principal Forgiveness [Member] | Non-PCI Loans | Commercial | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 326
Financing Receivable, Modifications, Number of Contracts | loans	4	2
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 490	$ 569
Principal Forgiveness [Member] | Non-PCI Loans | Noncommercial | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 122
Financing Receivable, Modifications, Number of Contracts | loans	0	1
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 0	$ 122
Principal Forgiveness [Member] | PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	1	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 634	$ 0
Financing Receivable, Modifications, Number of Contracts | loans	1	0
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 634	$ 0
Principal Forgiveness [Member] | PCI Loans | Commercial | Commercial and industrial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	1	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 634	$ 0
Financing Receivable, Modifications, Number of Contracts | loans	1	0
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 634	$ 0
Extended Maturity [Member] | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	2	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 273	$ 40
Financing Receivable, Modifications, Number of Contracts | loans	47	37
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 6,517	$ 6,919
Extended Maturity [Member] | Non-PCI Loans | Commercial | Construction and land development
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 40
Financing Receivable, Modifications, Number of Contracts | loans	0	1
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 0	$ 40
Extended Maturity [Member] | Non-PCI Loans | Commercial | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0
Financing Receivable, Modifications, Number of Contracts | loans	3	7
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 2,240	$ 2,428
Extended Maturity [Member] | Non-PCI Loans | Commercial | Other commercial real estate
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0
Financing Receivable, Modifications, Number of Contracts | loans	0	1
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 0	$ 747
Extended Maturity [Member] | Non-PCI Loans | Commercial | Commercial and industrial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0
Financing Receivable, Modifications, Number of Contracts | loans	9	8
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 246	$ 1,070
Extended Maturity [Member] | Non-PCI Loans | Noncommercial | Construction and land development
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0
Financing Receivable, Modifications, Number of Contracts | loans	1	2
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 35	$ 421
Extended Maturity [Member] | Non-PCI Loans | Noncommercial | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	1	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 243	$ 0
Financing Receivable, Modifications, Number of Contracts | loans	10	15
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 1,915	$ 2,183
Extended Maturity [Member] | Non-PCI Loans | Noncommercial | Revolving mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	1	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 30	$ 0
Financing Receivable, Modifications, Number of Contracts | loans	14	0
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 1,233	$ 0
Extended Maturity [Member] | Non-PCI Loans | Noncommercial | Consumer
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0
Financing Receivable, Modifications, Number of Contracts | loans	9	3
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 327	$ 30
Interest Rate Below Market Reduction [Member] | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	109	87
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 7,882	$ 6,054
Financing Receivable, Modifications, Number of Contracts | loans	355	309
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 29,373	$ 28,299
Interest Rate Below Market Reduction [Member] | Non-PCI Loans | Commercial | Construction and land development
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	2	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 170	$ 0
Financing Receivable, Modifications, Number of Contracts | loans	3	6
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 170	$ 231
Interest Rate Below Market Reduction [Member] | Non-PCI Loans | Commercial | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	16	16
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 2,001	$ 1,986
Financing Receivable, Modifications, Number of Contracts | loans	49	45
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 11,716	$ 12,030
Interest Rate Below Market Reduction [Member] | Non-PCI Loans | Commercial | Other commercial real estate
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	3	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 181	$ 0
Financing Receivable, Modifications, Number of Contracts | loans	5	3
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 340	$ 619
Interest Rate Below Market Reduction [Member] | Non-PCI Loans | Commercial | Commercial and industrial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	9	11
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 452	$ 1,144
Financing Receivable, Modifications, Number of Contracts | loans	27	34
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 1,227	$ 3,056
Interest Rate Below Market Reduction [Member] | Non-PCI Loans | Commercial | Lease financing
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	2	4
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 588	$ 152
Financing Receivable, Modifications, Number of Contracts | loans	3	4
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 633	$ 152
Interest Rate Below Market Reduction [Member] | Non-PCI Loans | Noncommercial | Construction and land development
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	3	4
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 43	$ 96
Financing Receivable, Modifications, Number of Contracts | loans	16	15
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 1,877	$ 676
Interest Rate Below Market Reduction [Member] | Non-PCI Loans | Noncommercial | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	33	48
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 2,867	$ 2,583
Financing Receivable, Modifications, Number of Contracts | loans	104	185
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 6,858	$ 11,087
Interest Rate Below Market Reduction [Member] | Non-PCI Loans | Noncommercial | Revolving mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	36	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 1,550	$ 0
Financing Receivable, Modifications, Number of Contracts | loans	129	5
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 6,457	$ 106
Interest Rate Below Market Reduction [Member] | Non-PCI Loans | Noncommercial | Consumer
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	5	2
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 30	$ 15
Financing Receivable, Modifications, Number of Contracts | loans	18	10
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 95	$ 222
Interest Rate Below Market Reduction [Member] | Non-PCI Loans | Noncommercial | Other
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 78
Financing Receivable, Modifications, Number of Contracts | loans	1	2
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 0	$ 120
Interest Rate Below Market Reduction [Member] | PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	1	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 101	$ 0
Financing Receivable, Modifications, Number of Contracts | loans	8	8
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 1,039	$ 3,479
Interest Rate Below Market Reduction [Member] | PCI Loans | Commercial | Construction and land development
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0
Financing Receivable, Modifications, Number of Contracts | loans	0	1
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 0	$ 52
Interest Rate Below Market Reduction [Member] | PCI Loans | Commercial | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0
Financing Receivable, Modifications, Number of Contracts | loans	4	4
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 725	$ 3,255
Interest Rate Below Market Reduction [Member] | PCI Loans | Noncommercial | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	1	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 101	$ 0
Financing Receivable, Modifications, Number of Contracts | loans	4	3
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 314	$ 172
Discharge of Debt [Member] | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	89	53
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 2,681	$ 1,016
Financing Receivable, Modifications, Number of Contracts | loans	210	154
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 9,912	$ 5,122
Discharge of Debt [Member] | Non-PCI Loans | Commercial | Construction and land development
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	1	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 15	$ 22
Financing Receivable, Modifications, Number of Contracts | loans	1	1
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 15	$ 22
Discharge of Debt [Member] | Non-PCI Loans | Commercial | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	1	2
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 73
Financing Receivable, Modifications, Number of Contracts | loans	8	4
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 2,052	$ 347
Discharge of Debt [Member] | Non-PCI Loans | Commercial | Commercial and industrial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	7	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0
Financing Receivable, Modifications, Number of Contracts | loans	10	6
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 56	$ 83
Discharge of Debt [Member] | Non-PCI Loans | Commercial | Lease financing
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	16	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 431	$ 0
Financing Receivable, Modifications, Number of Contracts | loans	17	1
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 431	$ 84
Discharge of Debt [Member] | Non-PCI Loans | Noncommercial | Construction and land development
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	2	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 35	$ 0
Financing Receivable, Modifications, Number of Contracts | loans	2	0
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 35	$ 0
Discharge of Debt [Member] | Non-PCI Loans | Noncommercial | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	17	14
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 1,161	$ 326
Financing Receivable, Modifications, Number of Contracts | loans	41	22
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 3,723	$ 773
Discharge of Debt [Member] | Non-PCI Loans | Noncommercial | Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	30	23
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 315	$ 250
Financing Receivable, Modifications, Number of Contracts | loans	85	69
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 1,003	$ 770
Discharge of Debt [Member] | Non-PCI Loans | Noncommercial | Revolving mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	15	13
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 724	$ 345
Financing Receivable, Modifications, Number of Contracts | loans	46	51
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 2,597	$ 3,043
Discharge of Debt [Member] | PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	2	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 419	$ 3
Financing Receivable, Modifications, Number of Contracts | loans	6	2
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 953	$ 2,965
Discharge of Debt [Member] | PCI Loans | Commercial | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	1	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 262	$ 3
Financing Receivable, Modifications, Number of Contracts | loans	3	2
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 458	$ 2,965
Discharge of Debt [Member] | PCI Loans | Noncommercial | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	1	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 157	$ 0
Financing Receivable, Modifications, Number of Contracts | loans	3	0
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 495	$ 0