Allowance for Loan and Lease Losses (Troubled Debt Restructuring) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
TDRs
Financing Receivable, Modifications [Line Items]
Accruing	$ 156,496	$ 175,955
Nonaccruing	39,425	30,801
Financing Receivable, Modifications, Recorded Investment	195,921	206,756
Originated Loans
Financing Receivable, Modifications [Line Items]
Nonaccruing	46,485	53,170
Originated Loans | TDRs
Financing Receivable, Modifications [Line Items]
Accruing	93,904	85,126
Nonaccruing	21,564	19,322
Financing Receivable, Modifications, Recorded Investment	115,468	104,448
Acquired Loans | TDRs
Financing Receivable, Modifications [Line Items]
Accruing	62,592	90,829
Nonaccruing	17,861	11,479
Financing Receivable, Modifications, Recorded Investment	80,453	102,308
Commercial | TDRs
Financing Receivable, Modifications [Line Items]
Accruing	120,206	147,712
Nonaccruing	36,506	26,681
Financing Receivable, Modifications, Recorded Investment	156,712	174,393
Commercial | Construction and land development | TDRs
Financing Receivable, Modifications [Line Items]
Accruing	5,946	21,032
Nonaccruing	2,248	1,002
Financing Receivable, Modifications, Recorded Investment	8,194	22,034
Commercial | Construction and land development | Originated Loans
Financing Receivable, Modifications [Line Items]
Nonaccruing	659	544
Commercial | Mortgage | TDRs
Financing Receivable, Modifications [Line Items]
Accruing	99,843	113,323
Nonaccruing	32,019	23,387
Financing Receivable, Modifications, Recorded Investment	131,862	136,710
Commercial | Mortgage | Originated Loans
Financing Receivable, Modifications [Line Items]
Nonaccruing	28,591	33,529
Commercial | Other commercial real estate | TDRs
Financing Receivable, Modifications [Line Items]
Accruing	3,203	3,470
Nonaccruing	1,277	1,150
Financing Receivable, Modifications, Recorded Investment	4,480	4,620
Commercial | Other commercial real estate | Originated Loans
Financing Receivable, Modifications [Line Items]
Nonaccruing	1,385	1,610
Commercial | Commercial and industrial | TDRs
Financing Receivable, Modifications [Line Items]
Accruing	10,935	9,838
Nonaccruing	818	1,142
Financing Receivable, Modifications, Recorded Investment	11,753	10,980
Commercial | Commercial and industrial | Originated Loans
Financing Receivable, Modifications [Line Items]
Nonaccruing	1,367	1,428
Commercial | Lease financing | TDRs
Financing Receivable, Modifications [Line Items]
Accruing	233	49
Nonaccruing	144	0
Financing Receivable, Modifications, Recorded Investment	377	49
Commercial | Lease financing | Originated Loans
Financing Receivable, Modifications [Line Items]
Nonaccruing	624	832
Commercial | Other | TDRs
Financing Receivable, Modifications [Line Items]
Accruing	46	0
Nonaccruing	0	0
Financing Receivable, Modifications, Recorded Investment	46	0
Noncommerical | TDRs
Financing Receivable, Modifications [Line Items]
Accruing	36,290	28,243
Nonaccruing	2,919	4,120
Financing Receivable, Modifications, Recorded Investment	39,209	32,363
Noncommerical | Mortgage | TDRs
Financing Receivable, Modifications [Line Items]
Accruing	29,598	23,343
Nonaccruing	2,919	3,663
Financing Receivable, Modifications, Recorded Investment	32,517	27,006
Noncommerical | Mortgage | Originated Loans
Financing Receivable, Modifications [Line Items]
Nonaccruing	13,836	14,701
Noncommerical | Construction and land development | TDRs
Financing Receivable, Modifications [Line Items]
Accruing	1,934	651
Nonaccruing	0	457
Financing Receivable, Modifications, Recorded Investment	1,934	1,108
Noncommerical | Construction and land development | Originated Loans
Financing Receivable, Modifications [Line Items]
Nonaccruing	0	457
Noncommerical | Revolving mortgage | TDRs
Financing Receivable, Modifications [Line Items]
Accruing	3,821	3,095
Nonaccruing	0	0
Financing Receivable, Modifications, Recorded Investment	3,821	3,095
Noncommerical | Revolving mortgage | Originated Loans
Financing Receivable, Modifications [Line Items]
Nonaccruing	0	0
Noncommerical | Consumer and Other | TDRs
Financing Receivable, Modifications [Line Items]
Accruing	937	1,154
Nonaccruing	0	0
Financing Receivable, Modifications, Recorded Investment	$ 937	$ 1,154