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Allowance for Loan and Lease Losses (Gross Loan and Allowance for loan and lease losses) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans and Leases Receivable, Gross, Carrying Amount $ 4,689,259 $ 4,669,192    
Non-covered acquired loans accounted under ASC 310-20
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 0 0    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 3,618 2,354    
Financing Receivable, Allowance for Credit Losses 3,618 2,354 386 0
Financing Receivable, Individually Evaluated for Impairment 0 0    
Financing Receivable, Collectively Evaluated for Impairment 392,491 435,439    
Loans and Leases Receivable, Gross, Carrying Amount 392,491 435,439    
Non-covered originated loans [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 9,705 10,139    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 39,802 38,942    
Financing Receivable, Allowance for Credit Losses 49,507 49,081 42,334 39,921
Financing Receivable, Individually Evaluated for Impairment 115,511 112,639    
Financing Receivable, Collectively Evaluated for Impairment 2,427,216 2,288,901    
Loans and Leases Receivable, Gross, Carrying Amount 2,542,727 2,401,540    
Residential Portfolio Segment | Non-covered acquired loans accounted under ASC 310-20
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Financing Receivable, Allowance for Credit Losses     0  
Residential Portfolio Segment | Non-covered originated loans [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 8,001 8,708    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 11,510 11,229    
Financing Receivable, Allowance for Credit Losses 19,511 19,937 22,889 21,092
Financing Receivable, Individually Evaluated for Impairment 87,744 84,494    
Financing Receivable, Collectively Evaluated for Impairment 694,406 681,771    
Loans and Leases Receivable, Gross, Carrying Amount 782,150 766,265    
Commercial Portfolio Segment | Non-covered acquired loans accounted under ASC 310-20
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 0 0    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 867 926    
Financing Receivable, Allowance for Credit Losses 867 926 386 0
Financing Receivable, Individually Evaluated for Impairment 0 0    
Financing Receivable, Collectively Evaluated for Impairment 71,577 77,681    
Loans and Leases Receivable, Gross, Carrying Amount 71,577 77,681    
Commercial Portfolio Segment | Non-covered originated loans [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 1,704 1,431    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 12,290 13,466    
Financing Receivable, Allowance for Credit Losses 13,994 14,897 16,314 17,072
Financing Receivable, Individually Evaluated for Impairment 27,767 28,145    
Financing Receivable, Collectively Evaluated for Impairment 1,142,378 1,099,512    
Loans and Leases Receivable, Gross, Carrying Amount 1,170,145 1,127,657    
Consumer Portfolio Segment | Non-covered acquired loans accounted under ASC 310-20
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 0 0    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 504 0    
Financing Receivable, Allowance for Credit Losses 504 0 0 0
Financing Receivable, Individually Evaluated for Impairment 0 0    
Financing Receivable, Collectively Evaluated for Impairment 52,049 56,174    
Loans and Leases Receivable, Gross, Carrying Amount 52,049 56,174    
Consumer Portfolio Segment | Non-covered originated loans [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 0 0    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 7,135 6,006    
Financing Receivable, Allowance for Credit Losses 7,135 6,006 1,313 856
Financing Receivable, Individually Evaluated for Impairment 0 0    
Financing Receivable, Collectively Evaluated for Impairment 142,492 127,744    
Loans and Leases Receivable, Gross, Carrying Amount 142,492 127,744    
Auotomobile loans portfolio segment [Member] | Non-covered acquired loans accounted under ASC 310-20
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 0 0    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 2,247 1,428    
Financing Receivable, Allowance for Credit Losses 2,247 1,428    
Financing Receivable, Individually Evaluated for Impairment 0 0    
Financing Receivable, Collectively Evaluated for Impairment 268,865 301,584    
Loans and Leases Receivable, Gross, Carrying Amount 268,865 301,584    
Auotomobile loans portfolio segment [Member] | Non-covered originated loans [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 0 0    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 8,731 7,866    
Financing Receivable, Allowance for Credit Losses 8,731 7,866    
Financing Receivable, Individually Evaluated for Impairment 0 0    
Financing Receivable, Collectively Evaluated for Impairment 447,940 379,874    
Loans and Leases Receivable, Gross, Carrying Amount 447,940 379,874    
Auto and Leasing loans receivable [Member] | Non-covered originated loans [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Financing Receivable, Allowance for Credit Losses 8,731 7,866 1,741 533
Unallocated Financing Receivables | Non-covered acquired loans accounted under ASC 310-20
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 0 0    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 0 0    
Financing Receivable, Allowance for Credit Losses 0 0 0 0
Financing Receivable, Individually Evaluated for Impairment 0 0    
Financing Receivable, Collectively Evaluated for Impairment 0 0    
Loans and Leases Receivable, Gross, Carrying Amount 0 0    
Unallocated Financing Receivables | Non-covered originated loans [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 0 0    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 136 375    
Financing Receivable, Allowance for Credit Losses 136 375 77 368
Financing Receivable, Individually Evaluated for Impairment 0 0    
Financing Receivable, Collectively Evaluated for Impairment 0 0    
Loans and Leases Receivable, Gross, Carrying Amount $ 0 $ 0