Allowance for Loan and Lease Losses (Details 3) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total $ 3,196,507 $ 2,955,473
Commercial and industrial, total
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 765,730 692,080
Commercial real estate, total
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 1,411,314 1,303,867
Residential real estate, total
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 933,294 856,856
Consumer and other, total
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 54,738 60,452
Finance Leases
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 5,563 4,618
Covered Loans
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 25,868 37,600
Orginated Loans and Leases
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually Evaluated For Impairment 22,156 24,732
Collectively Evaluated For Impairment 2,507,311 2,109,237
Total 2,529,467 2,133,969
Orginated Loans and Leases | Commercial and industrial, total
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually Evaluated For Impairment 4,664 2,771
Collectively Evaluated For Impairment 632,563 521,882
Total 637,227 524,653
Orginated Loans and Leases | Commercial real estate, total
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually Evaluated For Impairment 16,269 21,478
Collectively Evaluated For Impairment 986,119 790,709
Total 1,002,388 812,187
Orginated Loans and Leases | Residential real estate, total
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually Evaluated For Impairment 1,223 483
Collectively Evaluated For Impairment 829,552 733,098
Total 830,775 733,581
Orginated Loans and Leases | Consumer and other, total
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually Evaluated For Impairment 0 0
Collectively Evaluated For Impairment 53,514 58,930
Total 53,514 58,930
Orginated Loans and Leases | Finance Leases
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually Evaluated For Impairment 0 0
Collectively Evaluated For Impairment 5,563 4,618
Total 5,563 4,618
Orginated Loans and Leases | Covered Loans
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 0 0
Acquired Loans and Leases
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually Evaluated For Impairment 4,733 2,335
Loans Acquired With Deteriorated Credit Quality 46,809 85,077
Collectively Evaluated For Impairment 615,498 734,092
Total 667,040 821,504
Acquired Loans and Leases | Commercial and industrial, total
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually Evaluated For Impairment 2,231 519
Loans Acquired With Deteriorated Credit Quality 2,558 7,144
Collectively Evaluated For Impairment 123,714 159,764
Total 128,503 167,427
Acquired Loans and Leases | Commercial real estate, total
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually Evaluated For Impairment 2,429 1,816
Loans Acquired With Deteriorated Credit Quality 10,263 24,032
Collectively Evaluated For Impairment 396,234 465,832
Total 408,926 491,680
Acquired Loans and Leases | Residential real estate, total
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually Evaluated For Impairment 73 0
Loans Acquired With Deteriorated Credit Quality 9,355 17,650
Collectively Evaluated For Impairment 93,091 105,625
Total 102,519 123,275
Acquired Loans and Leases | Consumer and other, total
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually Evaluated For Impairment 0 0
Loans Acquired With Deteriorated Credit Quality 0 0
Collectively Evaluated For Impairment 1,224 1,522
Total 1,224 1,522
Acquired Loans and Leases | Finance Leases
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 0 0
Acquired Loans and Leases | Covered Loans
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually Evaluated For Impairment 0 0
Loans Acquired With Deteriorated Credit Quality 24,633 36,251
Collectively Evaluated For Impairment 1,235 1,349
Total $ 25,868 $ 37,600