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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
Sep. 30, 2014
Jun. 30, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]            
Loans and Leases Receivable, Gross, Carrying Amount $ 4,589,736   $ 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 4,460   2,354      
Financing Receivable, Allowance for Credit Losses 4,460 3,444 2,354 2,041 924 0
Financing Receivable, Individually Evaluated for Impairment 0   0      
Financing Receivable, Collectively Evaluated for Impairment 285,076   435,439      
Loans and Leases Receivable, Gross, Carrying Amount 285,076   435,439      
Most recent acquired loans accounted under ASC 310-30
            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Financing Receivable, Allowance for Credit Losses 10,120 6,278 2,863      
Non-covered originated loans [Member]
            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 9,040   10,139      
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 41,239   38,942      
Financing Receivable, Allowance for Credit Losses 50,279 50,638 49,081 47,573 45,701 39,921
Financing Receivable, Individually Evaluated for Impairment 318,275   112,639      
Financing Receivable, Collectively Evaluated for Impairment 2,408,840   2,288,901      
Loans and Leases Receivable, Gross, Carrying Amount 2,727,115   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       680    
Residential Portfolio Segment | Most recent acquired loans accounted under ASC 310-30
            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Financing Receivable, Allowance for Credit Losses 0 0 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 7,932   8,708      
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 10,940   11,229      
Financing Receivable, Allowance for Credit Losses 18,872 19,062 19,937 20,991 21,375 21,092
Financing Receivable, Individually Evaluated for Impairment 91,692   84,494      
Financing Receivable, Collectively Evaluated for Impairment 699,414   681,771      
Loans and Leases Receivable, Gross, Carrying Amount 791,106   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 270   926      
Financing Receivable, Allowance for Credit Losses 270 464 926 1,361 924 0
Financing Receivable, Individually Evaluated for Impairment 0   0      
Financing Receivable, Collectively Evaluated for Impairment 26,984   77,681      
Loans and Leases Receivable, Gross, Carrying Amount 26,984   77,681      
Commercial Portfolio Segment | Most recent acquired loans accounted under ASC 310-30
            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Financing Receivable, Allowance for Credit Losses 10,115 6,216 1,713      
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 1,108   1,431      
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 8,004   13,466      
Financing Receivable, Allowance for Credit Losses 9,112 12,423 14,897 14,715 17,624 17,072
Financing Receivable, Individually Evaluated for Impairment 226,583   28,145      
Financing Receivable, Collectively Evaluated for Impairment 990,652   1,099,512      
Loans and Leases Receivable, Gross, Carrying Amount 1,217,235   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 1,031   0      
Financing Receivable, Allowance for Credit Losses 1,031 338 0 0 0 0
Financing Receivable, Individually Evaluated for Impairment 0   0      
Financing Receivable, Collectively Evaluated for Impairment 47,284   56,174      
Loans and Leases Receivable, Gross, Carrying Amount 47,284   56,174      
Consumer Portfolio Segment | Most recent acquired loans accounted under ASC 310-30
            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Financing Receivable, Allowance for Credit Losses 5 62 418      
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 8,709   6,006      
Financing Receivable, Allowance for Credit Losses 8,709 7,887 6,006 4,828 2,341 856
Financing Receivable, Individually Evaluated for Impairment 0   0      
Financing Receivable, Collectively Evaluated for Impairment 175,882   127,744      
Loans and Leases Receivable, Gross, Carrying Amount 175,882   127,744      
Auotomobile Loans 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 3,159   1,428      
Financing Receivable, Allowance for Credit Losses 3,159   1,428      
Financing Receivable, Individually Evaluated for Impairment 0   0      
Financing Receivable, Collectively Evaluated for Impairment 210,808   301,584      
Loans and Leases Receivable, Gross, Carrying Amount 210,808   301,584      
Auto and Leasing loans receivable
            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Financing Receivable, Allowance for Credit Losses 13,404          
Auto and Leasing loans receivable | 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 13,404   7,866      
Financing Receivable, Allowance for Credit Losses 13,404 11,127 7,866 6,118 3,641 533
Financing Receivable, Individually Evaluated for Impairment 0   0      
Financing Receivable, Collectively Evaluated for Impairment 542,892   379,874      
Loans and Leases Receivable, Gross, Carrying Amount 542,892   379,874      
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 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 182   375      
Financing Receivable, Allowance for Credit Losses 182 139 375 921 720 368
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