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Allowance for Loan and Lease Losses (Allocation of Allowance for Loan and Lease Losses) (Details) (USD $)
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan and lease losses $ 222,942,000   $ 233,394,000
Originated Loans
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Unpaid principal balance 133,101,000   145,485,000
ALLL for loans and leases individually evaluated for impairment 9,495,000   10,161,000
Financing Receivable, Individually Evaluated for Impairment 123,067,000   132,146,000
Average balance 131,647,000 161,014,000  
Interest income recognized 1,513,000 2,123,000  
Originated Loans | Commercial | Construction and land development
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Unpaid principal balance 3,294,000   7,306,000
ALLL for loans and leases individually evaluated for impairment 144,000   103,000
Financing Receivable, Individually Evaluated for Impairment 2,329,000   2,272,000
Average balance 1,031,000 9,284,000  
Interest income recognized 15,000 112,000  
Originated Loans | Commercial | Mortgage
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Unpaid principal balance 94,950,000   103,522,000
ALLL for loans and leases individually evaluated for impairment 6,400,000   6,873,000
Financing Receivable, Individually Evaluated for Impairment 88,987,000   97,111,000
Average balance 94,547,000 103,848,000  
Interest income recognized 1,120,000 1,425,000  
Originated Loans | Commercial | Other commercial real estate
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Unpaid principal balance 2,027,000   2,279,000
ALLL for loans and leases individually evaluated for impairment 203,000   209,000
Financing Receivable, Individually Evaluated for Impairment 1,627,000   1,878,000
Average balance 1,796,000 3,179,000  
Interest income recognized 21,000 45,000  
Originated Loans | Commercial | Commercial and industrial
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Unpaid principal balance 10,055,000   10,393,000
ALLL for loans and leases individually evaluated for impairment 769,000   771,000
Financing Receivable, Individually Evaluated for Impairment 8,804,000   9,300,000
Average balance 10,234,000 18,997,000  
Interest income recognized 118,000 266,000  
Originated Loans | Commercial | Lease financing
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Unpaid principal balance 393,000   188,000
ALLL for loans and leases individually evaluated for impairment 13,000   54,000
Financing Receivable, Individually Evaluated for Impairment 393,000   188,000
Average balance 284,000 355,000  
Interest income recognized 4,000 6,000  
Originated Loans | Commercial | Other
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
ALLL for loans and leases individually evaluated for impairment 0   0
Financing Receivable, Individually Evaluated for Impairment 0   0
Originated Loans | Noncommerical | Mortgage
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Unpaid principal balance 16,026,000   15,939,000
ALLL for loans and leases individually evaluated for impairment 1,418,000   1,586,000
Financing Receivable, Individually Evaluated for Impairment 15,626,000   15,539,000
Average balance 16,482,000 17,330,000  
Interest income recognized 174,000 228,000  
Originated Loans | Noncommerical | Construction and land development
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Unpaid principal balance 699,000   1,108,000
ALLL for loans and leases individually evaluated for impairment 77,000   72,000
Financing Receivable, Individually Evaluated for Impairment 699,000   1,108,000
Average balance 2,322,000 866,000  
Interest income recognized 29,000 11,000  
Originated Loans | Noncommerical | Revolving mortgage
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Unpaid principal balance 4,618,000   3,596,000
ALLL for loans and leases individually evaluated for impairment 353,000   372,000
Financing Receivable, Individually Evaluated for Impairment 3,587,000   3,596,000
Average balance 3,892,000 5,472,000  
Interest income recognized 27,000 25,000  
Originated Loans | Noncommerical | Consumer
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Unpaid principal balance 1,039,000   1,154,000
ALLL for loans and leases individually evaluated for impairment 118,000   121,000
Financing Receivable, Individually Evaluated for Impairment 1,015,000   1,154,000
Average balance 1,059,000 1,683,000  
Interest income recognized 5,000 5,000  
Originated Loans | With A Recorded Allowance
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total impaired noncovered loans and leases 82,285,000   83,678,000
Originated Loans | With A Recorded Allowance | Commercial | Construction and land development
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan and lease losses 1,646,000   1,025,000
Originated Loans | With A Recorded Allowance | Commercial | Mortgage
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan and lease losses 57,568,000   57,819,000
Originated Loans | With A Recorded Allowance | Commercial | Other commercial real estate
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan and lease losses 755,000   783,000
Originated Loans | With A Recorded Allowance | Commercial | Commercial and industrial
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan and lease losses 6,530,000   7,197,000
Originated Loans | With A Recorded Allowance | Commercial | Lease financing
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan and lease losses 238,000   133,000
Originated Loans | With A Recorded Allowance | Noncommerical | Mortgage
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan and lease losses 10,624,000   11,534,000
Originated Loans | With A Recorded Allowance | Noncommerical | Construction and land development
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan and lease losses 699,000   651,000
Originated Loans | With A Recorded Allowance | Noncommerical | Revolving mortgage
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan and lease losses 3,210,000   3,382,000
Originated Loans | With A Recorded Allowance | Noncommerical | Consumer
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan and lease losses 1,015,000   1,154,000
Originated Loans | With No Recorded Allowance
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan and lease losses 40,782,000   48,468,000
Originated Loans | With No Recorded Allowance | Commercial | Construction and land development
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan and lease losses 683,000   1,247,000
Originated Loans | With No Recorded Allowance | Commercial | Mortgage
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan and lease losses 31,419,000   39,292,000
Originated Loans | With No Recorded Allowance | Commercial | Other commercial real estate
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan and lease losses 872,000   1,095,000
Originated Loans | With No Recorded Allowance | Commercial | Commercial and industrial
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan and lease losses 2,274,000   2,103,000
Originated Loans | With No Recorded Allowance | Commercial | Lease financing
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan and lease losses 155,000   55,000
Originated Loans | With No Recorded Allowance | Noncommerical | Mortgage
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan and lease losses 5,002,000   4,005,000
Originated Loans | With No Recorded Allowance | Noncommerical | Construction and land development
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan and lease losses 0   457,000
Originated Loans | With No Recorded Allowance | Noncommerical | Revolving mortgage
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan and lease losses 377,000   214,000
Originated Loans | With No Recorded Allowance | Noncommerical | Consumer
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan and lease losses 0   0
Acquired Loans
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Acquired loans which have adverse change in expected cash flows $ 382,600,000   $ 459,900,000