Allowance for Loan and Lease Losses (Troubled Debt Restructuring) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($) loans	Mar. 31, 2017 USD ($) loans	Dec. 31, 2017 USD ($)
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	$ 163,470		$ 164,561
Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	118	99
Financing Receivable, Modifications, Recorded Investment	$ 144,840		146,126
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
PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	3	2
Financing Receivable, Modifications, Recorded Investment	$ 18,630		18,435
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
Commercial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	87,067		95,392
Commercial | Construction and land development
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	1,201		4,572
Commercial | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	74,408		78,221
Commercial | Other commercial real estate
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	1,441		1,800
Commercial | Commercial and industrial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	8,049		8,508
Commercial | Lease financing
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	1,968		1,770
Commercial | Other
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	0		521
Noncommercial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	76,403		69,169
Noncommercial | Construction and land development
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	3,097		0
Noncommercial | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	46,083		43,542
Noncommercial | Revolving mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	24,631		22,853
Noncommercial | Consumer and Other
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	2,592		2,774
Accruing
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	131,920		130,391
Accruing | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	113,540		112,228
Accruing | PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	18,380		18,163
Accruing | Commercial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	71,244		76,300
Accruing | Commercial | Construction and land development
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	948		4,089
Accruing | Commercial | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	61,444		62,358
Accruing | Commercial | Other commercial real estate
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	950		1,012
Accruing | Commercial | Commercial and industrial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	7,000		7,598
Accruing | Commercial | Lease financing
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	902		722
Accruing | Commercial | Other
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	0		521
Accruing | Noncommercial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	60,676		54,091
Accruing | Noncommercial | Construction and land development
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	2,914		0
Accruing | Noncommercial | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	36,432		34,067
Accruing | Noncommercial | Revolving mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	19,267		17,673
Accruing | Noncommercial | Consumer and Other
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	2,063		2,351
Nonaccruing
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	31,550		34,170
Nonaccruing | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	31,300		33,898
Nonaccruing | PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	250		272
Nonaccruing | Commercial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	15,823		19,092
Nonaccruing | Commercial | Construction and land development
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	253		483
Nonaccruing | Commercial | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	12,964		15,863
Nonaccruing | Commercial | Other commercial real estate
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	491		788
Nonaccruing | Commercial | Commercial and industrial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	1,049		910
Nonaccruing | Commercial | Lease financing
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	1,066		1,048
Nonaccruing | Commercial | Other
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	0		0
Nonaccruing | Noncommercial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	15,727		15,078
Nonaccruing | Noncommercial | Construction and land development
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	183		0
Nonaccruing | Noncommercial | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	9,651		9,475
Nonaccruing | Noncommercial | Revolving mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	5,364		5,180
Nonaccruing | Noncommercial | Consumer and Other
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	$ 529		$ 423
Interest only period provided | PCI Loans
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
Interest only period provided | Commercial | Commercial and industrial | PCI Loans
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
Loan term extension | Non-PCI Loans
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
Loan term extension | Commercial | Mortgage | Non-PCI Loans
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
Loan term extension | Commercial | Other commercial real estate | Non-PCI Loans
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
Loan term extension | Commercial | Commercial and industrial | Non-PCI Loans
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
Loan term extension | Noncommercial | Consumer | Non-PCI Loans
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
Loan term extension | Noncommercial | Mortgage | Non-PCI Loans
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
Loan term extension | Noncommercial | Revolving mortgage | Non-PCI Loans
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
Below market interest rate | Non-PCI Loans
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
Below market interest rate | PCI Loans
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
Below market interest rate | Commercial | Construction and land development | Non-PCI Loans
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
Below market interest rate | Commercial | Mortgage | Non-PCI Loans
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
Below market interest rate | Commercial | Other commercial real estate | Non-PCI Loans
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
Below market interest rate | Commercial | Commercial and industrial | Non-PCI Loans
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
Below market interest rate | Commercial | Lease financing | Non-PCI Loans
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
Below market interest rate | Noncommercial | Construction and land development | Non-PCI Loans
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
Below market interest rate | Noncommercial | Consumer | Non-PCI Loans
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
Below market interest rate | Noncommercial | Mortgage | Non-PCI Loans
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
Below market interest rate | Noncommercial | Mortgage | PCI Loans
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
Below market interest rate | Noncommercial | Other | Non-PCI Loans
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
Below market interest rate | Noncommercial | Revolving mortgage | Non-PCI Loans
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
Discharged from bankruptcy | Non-PCI Loans
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
Discharged from bankruptcy | PCI Loans
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
Discharged from bankruptcy | Commercial | Mortgage | Non-PCI Loans
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
Discharged from bankruptcy | Commercial | Commercial and industrial | Non-PCI Loans
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
Discharged from bankruptcy | Commercial | Lease financing | Non-PCI Loans
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
Discharged from bankruptcy | Noncommercial | Consumer | Non-PCI Loans
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
Discharged from bankruptcy | Noncommercial | Mortgage | Non-PCI Loans
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
Discharged from bankruptcy | Noncommercial | Mortgage | PCI Loans
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
Discharged from bankruptcy | Noncommercial | Revolving mortgage | Non-PCI Loans
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