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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
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]            
Loans and Leases Receivable, Gross, Carrying Amount $ 4,644,028   $ 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 3,444   2,354      
Financing Receivable, Allowance for Credit Losses 3,444 3,618 2,354 924 386 0
Financing Receivable, Individually Evaluated for Impairment 0   0      
Financing Receivable, Collectively Evaluated for Impairment 326,605   435,439      
Loans and Leases Receivable, Gross, Carrying Amount 326,605   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 6,278 3,058 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 9,844   10,139      
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 40,794   38,942      
Financing Receivable, Allowance for Credit Losses 50,638 49,507 49,081 45,701 42,334 39,921
Financing Receivable, Individually Evaluated for Impairment 119,285   112,639      
Financing Receivable, Collectively Evaluated for Impairment 2,521,460   2,288,901      
Loans and Leases Receivable, Gross, Carrying Amount 2,640,745   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 | 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 7,730   8,708      
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 11,332   11,229      
Financing Receivable, Allowance for Credit Losses 19,062 19,511 19,937 21,375 22,889 21,092
Financing Receivable, Individually Evaluated for Impairment 90,375   84,494      
Financing Receivable, Collectively Evaluated for Impairment 697,626   681,771      
Loans and Leases Receivable, Gross, Carrying Amount 788,001   766,265      
Commercial Portfolio Segment
            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Financing Receivable, Allowance for Credit Losses 464   926 924   0
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 464   926      
Financing Receivable, Allowance for Credit Losses 464 867 926 924 386  
Financing Receivable, Individually Evaluated for Impairment 0   0      
Financing Receivable, Collectively Evaluated for Impairment 38,602   77,681      
Loans and Leases Receivable, Gross, Carrying Amount 38,602   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 6,216 2,653 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 2,114   1,431      
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 10,309   13,466      
Financing Receivable, Allowance for Credit Losses 12,423 13,994 14,897 17,623 16,314 17,072
Financing Receivable, Individually Evaluated for Impairment 28,910   28,145      
Financing Receivable, Collectively Evaluated for Impairment 1,154,262   1,099,512      
Loans and Leases Receivable, Gross, Carrying Amount 1,183,172   1,127,657      
Consumer Portfolio Segment
            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Financing Receivable, Allowance for Credit Losses 338   0 0   0
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 338   0      
Financing Receivable, Allowance for Credit Losses 338 504 0 0 0  
Financing Receivable, Individually Evaluated for Impairment 0   0      
Financing Receivable, Collectively Evaluated for Impairment 49,604   56,174      
Loans and Leases Receivable, Gross, Carrying Amount 49,604   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 62 405 418      
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 7,887   6,006      
Financing Receivable, Allowance for Credit Losses 7,887 7,135 6,006 2,342 1,313 856
Financing Receivable, Individually Evaluated for Impairment 0   0      
Financing Receivable, Collectively Evaluated for Impairment 161,538   127,744      
Loans and Leases Receivable, Gross, Carrying Amount 161,538   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 2,642   1,428      
Financing Receivable, Allowance for Credit Losses 2,642   1,428      
Financing Receivable, Individually Evaluated for Impairment 0   0      
Financing Receivable, Collectively Evaluated for Impairment 238,399   301,584      
Loans and Leases Receivable, Gross, Carrying Amount 238,399   301,584      
Auto and Leasing loans receivable
            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Financing Receivable, Allowance for Credit Losses 11,127          
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 11,127   7,866      
Financing Receivable, Allowance for Credit Losses 11,127 8,731 7,866 3,641 1,741 533
Financing Receivable, Individually Evaluated for Impairment 0   0      
Financing Receivable, Collectively Evaluated for Impairment 508,034   379,874      
Loans and Leases Receivable, Gross, Carrying Amount 508,034   379,874      
Unallocated Financing Receivables
            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Financing Receivable, Allowance for Credit Losses 0   0 0   0
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  
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 139   375      
Financing Receivable, Allowance for Credit Losses 139 136 375 720 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