Allowance for Loan and Lease Losses (Note Restructurings During Period) (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017 USD ($) loans	Sep. 30, 2016 USD ($) loans	Sep. 30, 2017 USD ($) loans	Sep. 30, 2016 USD ($) loans
Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	110	105	414	361
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 12,490	$ 10,584	$ 31,477	$ 32,321
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	65	42	153	115
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 3,848	$ 1,978	$ 10,070	$ 7,738
Non-PCI Loans | Loan term extension
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	6	9	31	23
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 156	$ 1,924	$ 2,787	$ 5,144
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	0	1	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 0	$ 0	$ 31	$ 0
Non-PCI Loans | Loan term extension | Commercial | 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	$ 424
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 | Commercial | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	0	3	1	7
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 0	$ 1,321	$ 425	$ 2,407
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	0	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 0	$ 0	$ 0	$ 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	1
Financing Receivable, Modifications, Post-Modification Recorded Investment | $			$ 0	$ 743
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 | Commercial | Commercial and industrial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	1	1	7	1
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 10	$ 22	$ 411	$ 22
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	0	0	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 0	$ 0	$ 0	$ 0
Non-PCI Loans | Loan term extension | Commercial | Other
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans			1	0
Financing Receivable, Modifications, Post-Modification Recorded Investment | $			$ 522	$ 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 | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	2	4	6	11
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 123	$ 572	$ 328	$ 1,539
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	0	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 0	$ 0	$ 0	$ 0
Non-PCI Loans | Loan term extension | Noncommercial | Revolving mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	1	0	10	0
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 20	$ 0	$ 1,059	$ 0
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	0	1	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 0	$ 0	$ 31	$ 0
Non-PCI Loans | Loan term extension | Noncommercial | Consumer
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	2	1	6	1
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 3	$ 9	$ 42	$ 9
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	0	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 0	$ 0	$ 0	$ 0
Non-PCI Loans | Interest only period provided
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	3	1	6	2
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 696	$ 124	$ 1,180	$ 369
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	1	1	2
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 0	$ 124	$ 328	$ 369
Non-PCI Loans | Interest only period provided | Commercial | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	3	0	5	1
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 696	$ 0	$ 1,097	$ 245
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	0	1	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 0	$ 0	$ 328	$ 245
Non-PCI Loans | Interest only period provided | Noncommercial | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	0	1	0	1
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 0	$ 124	$ 0	$ 124
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	1	0	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 0	$ 124	$ 0	$ 124
Non-PCI Loans | Interest only period provided | Noncommercial | Revolving mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans			1	0
Financing Receivable, Modifications, Post-Modification Recorded Investment | $			$ 83	$ 0
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	61	71	231	229
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 6,537	$ 7,914	$ 18,611	$ 22,298
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	27	25	75	71
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 1,956	$ 1,564	$ 5,332	$ 6,372
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	7	1	14
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 0	$ 128	$ 0	$ 510
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	2	0	4
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 0	$ 16	$ 0	$ 43
Non-PCI Loans | Below market interest rate | Commercial | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	10	6	33	34
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 3,643	$ 2,651	$ 8,580	$ 8,983
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	5	1	11	11
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 701	$ 32	$ 1,185	$ 1,719
Non-PCI Loans | Below market interest rate | Commercial | Other commercial real estate
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	2	2	3	3
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 210	$ 178	$ 211	$ 652
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	0	2	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 0	$ 0	$ 210	$ 9
Non-PCI Loans | Below market interest rate | Commercial | Commercial and industrial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	4	12	19	26
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 230	$ 2,340	$ 884	$ 3,086
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	2	5	5	12
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 30	$ 569	$ 314	$ 2,121
Non-PCI Loans | Below market interest rate | Commercial | Lease financing
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	0	2	3	2
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 0	$ 81	$ 755	$ 81
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	2	2	2
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 0	$ 81	$ 701	$ 81
Non-PCI Loans | Below market interest rate | Commercial | Other
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans			1	2
Financing Receivable, Modifications, Post-Modification Recorded Investment | $			$ 0	$ 125
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans			0	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $			$ 0	$ 81
Non-PCI Loans | Below market interest rate | Noncommercial | Construction and land development
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	2	0	10	0
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 33	$ 0	$ 696	$ 0
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	1	0	1	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 11	$ 0	$ 11	$ 0
Non-PCI Loans | Below market interest rate | Noncommercial | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	28	37	81	137
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 1,850	$ 2,449	$ 4,570	$ 8,703
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	9	13	29	37
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 936	$ 849	$ 2,216	$ 2,301
Non-PCI Loans | Below market interest rate | Noncommercial | Revolving mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	14	1	64	5
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 567	$ 12	$ 2,826	$ 109
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	8	0	22	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 274	$ 0	$ 678	$ 0
Non-PCI Loans | Below market interest rate | Noncommercial | Consumer
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	1	3	16	6
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 4	$ 31	$ 89	$ 49
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	2	2	3	3
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 4	$ 17	$ 17	$ 17
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	$ 44
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	40	24	146	107
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 5,101	$ 622	$ 8,899	$ 4,510
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	38	16	76	41
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 1,892	$ 290	$ 4,379	$ 997
Non-PCI Loans | Discharged from bankruptcy | Commercial | Construction and land development
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	0	1	1	1
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 0	$ 23	$ 16	$ 23
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	1	1	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 0	$ 23	$ 16	$ 23
Non-PCI Loans | Discharged from bankruptcy | Commercial | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	5	1	9	3
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 2,249	$ 13	$ 3,207	$ 291
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	1	1	2	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 429	$ 13	$ 1,134	$ 13
Non-PCI Loans | Discharged from bankruptcy | Commercial | Commercial and industrial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	9	0	10	3
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 865	$ 0	$ 865	$ 135
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	6	0	7	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 809	$ 0	$ 809	$ 0
Non-PCI Loans | Discharged from bankruptcy | Commercial | Lease financing
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	0	0	16	0
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 0	$ 0	$ 180	$ 0
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	15	0	15	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 180	$ 0	$ 180	$ 0
Non-PCI Loans | Discharged from bankruptcy | Noncommercial | Construction and land development
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans			1	0
Financing Receivable, Modifications, Post-Modification Recorded Investment | $			$ 19	$ 0
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans			1	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $			$ 19	$ 0
Non-PCI Loans | Discharged from bankruptcy | Noncommercial | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	6	2	25	18
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 1,357	$ 29	$ 2,443	$ 1,030
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	2	6	10	14
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 186	$ 143	$ 1,134	$ 647
Non-PCI Loans | Discharged from bankruptcy | Noncommercial | Revolving mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	10	9	32	42
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 469	$ 407	$ 1,630	$ 2,564
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	5	3	13	13
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 189	$ 37	$ 875	$ 177
Non-PCI Loans | Discharged from bankruptcy | Noncommercial | Consumer
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	10	11	52	40
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 161	$ 150	$ 539	$ 467
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	9	5	27	12
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 99	$ 74	$ 212	$ 137
PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	5	3	12	8
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 690	$ 3,125	$ 1,697	$ 5,252
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	2	1	2	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 423	$ 79	$ 423	$ 79
PCI Loans | Below market interest rate
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	2	2	7	7
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 322	$ 140	$ 915	$ 2,267
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	1	0	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 0	$ 79	$ 0	$ 79
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	$ 53
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 | Commercial | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	1	0	3	3
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 260	$ 0	$ 599	$ 2,026
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	0	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 0	$ 0	$ 0	$ 0
PCI Loans | Below market interest rate | Noncommercial | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	1	2	4	3
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 62	$ 140	$ 316	$ 188
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	0	1	0	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 0	$ 79	$ 0	$ 79
PCI Loans | Discharged from bankruptcy
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	3	1	5	1
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 368	$ 2,985	$ 782	$ 2,985
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	2	0	2	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 423	$ 0	$ 423	$ 0
PCI Loans | Discharged from bankruptcy | Commercial | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans			2	1
Financing Receivable, Modifications, Post-Modification Recorded Investment | $			$ 280	$ 2,985
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans			1	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $			$ 257	$ 0
PCI Loans | Discharged from bankruptcy | Noncommercial | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	2	1	3	0
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 280	$ 2,985	$ 502	$ 0
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	1	0	1	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 257	$ 0	$ 166	$ 0
PCI Loans | Discharged from bankruptcy | Noncommercial | Revolving mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	1	0
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 88	$ 0
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	1	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 166	$ 0