Allowance for Loan and Lease Losses (Troubled Debt Restructuring) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Modifications [Line Items]
Accruing	$ 175,955,000	$ 253,388,000
Nonaccruing	30,801,000	79,782,000
Financing Receivable, Modifications, Recorded Investment	206,756,000	333,170,000
Impaired Loans and Leases, Baseline for Meaurement	500,000
Originated Loans
Financing Receivable, Modifications [Line Items]
Nonaccruing	53,170,000	89,845,000
Financing Receivable, Modifications, Recorded Investment	104,448,000	139,963,000
Acquired Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	102,308,000	193,207,000
Commercial
Financing Receivable, Modifications [Line Items]
Accruing	147,712,000	220,397,000
Nonaccruing	26,681,000	73,954,000
Financing Receivable, Modifications, Recorded Investment	174,393,000	294,351,000
Commercial | Construction and land development
Financing Receivable, Modifications [Line Items]
Accruing	21,032,000	47,368,000
Nonaccruing	1,002,000	26,920,000
Financing Receivable, Modifications, Recorded Investment	22,034,000	74,288,000
Commercial | Construction and land development | Originated Loans
Financing Receivable, Modifications [Line Items]
Nonaccruing	544,000	14,930,000
Commercial | Mortgage
Financing Receivable, Modifications [Line Items]
Accruing	113,323,000	151,728,000
Nonaccruing	23,387,000	37,603,000
Financing Receivable, Modifications, Recorded Investment	136,710,000	189,331,000
Commercial | Mortgage | Originated Loans
Financing Receivable, Modifications [Line Items]
Nonaccruing	33,529,000	50,532,000
Commercial | Other commercial real estate
Financing Receivable, Modifications [Line Items]
Accruing	3,470,000	10,137,000
Nonaccruing	1,150,000	2,194,000
Financing Receivable, Modifications, Recorded Investment	4,620,000	12,331,000
Commercial | Other commercial real estate | Originated Loans
Financing Receivable, Modifications [Line Items]
Nonaccruing	1,610,000	2,319,000
Commercial | Commercial and industrial
Financing Receivable, Modifications [Line Items]
Accruing	9,838,000	10,940,000
Nonaccruing	1,142,000	7,237,000
Financing Receivable, Modifications, Recorded Investment	10,980,000	18,177,000
Commercial | Commercial and industrial | Originated Loans
Financing Receivable, Modifications [Line Items]
Nonaccruing	1,428,000	6,972,000
Commercial | Lease financing
Financing Receivable, Modifications [Line Items]
Accruing	49,000	224,000
Nonaccruing	0	0
Financing Receivable, Modifications, Recorded Investment	49,000	224,000
Commercial | Lease financing | Originated Loans
Financing Receivable, Modifications [Line Items]
Nonaccruing	832,000	1,075,000
Noncommerical
Financing Receivable, Modifications [Line Items]
Accruing	28,243,000	32,991,000
Nonaccruing	4,120,000	5,828,000
Financing Receivable, Modifications, Recorded Investment	32,363,000	38,819,000
Noncommerical | Mortgage
Financing Receivable, Modifications [Line Items]
Accruing	23,343,000	28,777,000
Nonaccruing	3,663,000	5,828,000
Financing Receivable, Modifications, Recorded Investment	27,006,000	34,605,000
Noncommerical | Mortgage | Originated Loans
Financing Receivable, Modifications [Line Items]
Nonaccruing	14,701,000	12,603,000
Noncommerical | Construction and land development
Financing Receivable, Modifications [Line Items]
Accruing	651,000	1,657,000
Nonaccruing	457,000	0
Financing Receivable, Modifications, Recorded Investment	1,108,000	1,657,000
Noncommerical | Construction and land development | Originated Loans
Financing Receivable, Modifications [Line Items]
Nonaccruing	457,000	668,000
Noncommerical | Revolving mortgage
Financing Receivable, Modifications [Line Items]
Accruing	3,095,000	48,000
Nonaccruing	0	0
Financing Receivable, Modifications, Recorded Investment	3,095,000	48,000
Noncommerical | Revolving mortgage | Originated Loans
Financing Receivable, Modifications [Line Items]
Nonaccruing	0	0
Noncommerical | Consumer and Other
Financing Receivable, Modifications [Line Items]
Accruing	1,154,000	2,509,000
Nonaccruing	0	0
Financing Receivable, Modifications, Recorded Investment	$ 1,154,000	$ 2,509,000