Allowance for Loan and Lease Losses (Troubled Debt Restructuring) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Financing Receivable, Modifications [Line Items]
Accruing	$ 198,658	$ 175,955
Nonaccruing	32,343	30,801
Financing Receivable, Modifications, Recorded Investment	231,001	206,756
TDRs
Financing Receivable, Modifications [Line Items]
Accruing	198,658	175,955
Nonaccruing	32,343	30,801
Financing Receivable, Modifications, Recorded Investment	231,001	206,756
Originated Loans
Financing Receivable, Modifications [Line Items]
Nonaccruing	46,952	53,170
Originated Loans | TDRs
Financing Receivable, Modifications [Line Items]
Accruing	93,016	85,126
Nonaccruing	20,717	19,322
Financing Receivable, Modifications, Recorded Investment	113,733	104,448
Acquired Loans | TDRs
Financing Receivable, Modifications [Line Items]
Accruing	105,642	90,829
Nonaccruing	11,626	11,479
Financing Receivable, Modifications, Recorded Investment	117,268	102,308
Commercial
Financing Receivable, Modifications [Line Items]
Accruing	169,838	147,712
Nonaccruing	28,537	26,681
Financing Receivable, Modifications, Recorded Investment	198,375	174,393
Commercial | Construction and land development
Financing Receivable, Modifications [Line Items]
Accruing	20,791	21,032
Nonaccruing	1,002	1,002
Financing Receivable, Modifications, Recorded Investment	21,793	22,034
Commercial | Construction and land development | Originated Loans
Financing Receivable, Modifications [Line Items]
Nonaccruing	702	544
Commercial | Mortgage
Financing Receivable, Modifications [Line Items]
Accruing	136,563	113,323
Nonaccruing	25,276	23,387
Financing Receivable, Modifications, Recorded Investment	161,839	136,710
Commercial | Mortgage | Originated Loans
Financing Receivable, Modifications [Line Items]
Nonaccruing	28,910	33,529
Commercial | Other commercial real estate
Financing Receivable, Modifications [Line Items]
Accruing	3,308	3,470
Nonaccruing	933	1,150
Financing Receivable, Modifications, Recorded Investment	4,241	4,620
Commercial | Other commercial real estate | Originated Loans
Financing Receivable, Modifications [Line Items]
Nonaccruing	1,459	1,610
Commercial | Commercial and industrial
Financing Receivable, Modifications [Line Items]
Accruing	8,929	9,838
Nonaccruing	1,180	1,142
Financing Receivable, Modifications, Recorded Investment	10,109	10,980
Commercial | Commercial and industrial | Originated Loans
Financing Receivable, Modifications [Line Items]
Nonaccruing	1,075	1,428
Commercial | Lease financing
Financing Receivable, Modifications [Line Items]
Accruing	247	49
Nonaccruing	146	0
Financing Receivable, Modifications, Recorded Investment	393	49
Commercial | Lease financing | Originated Loans
Financing Receivable, Modifications [Line Items]
Nonaccruing	689	832
Noncommerical
Financing Receivable, Modifications [Line Items]
Accruing	28,820	28,243
Nonaccruing	3,806	4,120
Financing Receivable, Modifications, Recorded Investment	32,626	32,363
Noncommerical | Mortgage
Financing Receivable, Modifications [Line Items]
Accruing	23,519	23,343
Nonaccruing	3,806	3,663
Financing Receivable, Modifications, Recorded Investment	27,325	27,006
Noncommerical | Mortgage | Originated Loans
Financing Receivable, Modifications [Line Items]
Nonaccruing	14,091	14,701
Noncommerical | Construction and land development
Financing Receivable, Modifications [Line Items]
Accruing	699	651
Nonaccruing	0	457
Financing Receivable, Modifications, Recorded Investment	699	1,108
Noncommerical | Construction and land development | Originated Loans
Financing Receivable, Modifications [Line Items]
Nonaccruing	0	457
Noncommerical | Revolving mortgage
Financing Receivable, Modifications [Line Items]
Accruing	3,587	3,095
Nonaccruing	0	0
Financing Receivable, Modifications, Recorded Investment	3,587	3,095
Noncommerical | Revolving mortgage | Originated Loans
Financing Receivable, Modifications [Line Items]
Nonaccruing	0	0
Noncommerical | Consumer and Other
Financing Receivable, Modifications [Line Items]
Accruing	1,015	1,154
Nonaccruing	0	0
Financing Receivable, Modifications, Recorded Investment	$ 1,015	$ 1,154