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Loans and Allowance for Loan and Lease Losses (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Financing Receivable Investment Past Due [Line Items]      
Capital Leases, Net Investment in Direct Financing Leases $ 642,731,000 $ 472,393,000  
Purchases of loans 1,266,097,000 787,834,000 $ 955,995,000
Unpaid principal balance of real estate loans pledged as security for FHLB advances 10,200,000,000    
Recorded investment of real estate loans pledged as security for FHLB advances 9,400,000,000    
Unpaid principal balance of ACI loans 1,500,000,000 2,000,000,000  
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans 3,500,000 $ 2,400,000  
The value at which non accrual status commercial relationships are evaluated for impairment $ 1,000,000    
1-4 single family residential      
Financing Receivable Investment Past Due [Line Items]      
Percent of loans by state 100.00% 100.00%  
Indirect Auto [Member]      
Financing Receivable Investment Past Due [Line Items]      
Recorded investment in loans sold     303,000,000
Residential      
Financing Receivable Investment Past Due [Line Items]      
Mortgage Loans in Process of Foreclosure, Amount $ 8,000,000 $ 13,000,000  
New Loans | 1-4 single family residential      
Financing Receivable Investment Past Due [Line Items]      
Purchases of loans $ 1,266,097,000 $ 788,000,000  
Percent of loans by state 100.00% 100.00%  
New Loans | Commercial Lending Subsidiaries      
Financing Receivable Investment Past Due [Line Items]      
Capital Leases, Net Investment in Direct Financing Leases $ 643,000,000 $ 472,000,000  
Recorded Investment, With no specific allowance recorded 10,620,000 3,839,000  
ACI loans | Commercial Real Estate [Member]      
Financing Receivable Investment Past Due [Line Items]      
Recorded Investment, With no specific allowance recorded 1,300,000 500,000  
ACI loans | Residential      
Financing Receivable Investment Past Due [Line Items]      
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 16,000,000 22,000,000  
New and Non-ACI loans      
Financing Receivable Investment Past Due [Line Items]      
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 1,600,000 1,400,000  
Covered [Member] | Commercial      
Financing Receivable Investment Past Due [Line Items]      
Recorded investment in loans sold     83,052,000
Covered [Member] | Residential      
Financing Receivable Investment Past Due [Line Items]      
Unpaid principal balance of loans sold from pool of ACI loans with zero carrying value 0 0 50,000,000
Recorded investment in loans sold 185,837,000 172,496,000 $ 144,231,000
Other Real Estate, Foreclosed Assets, and Repossessed Assets 5,000,000 $ 9,000,000  
Minimum | Commercial      
Financing Receivable Investment Past Due [Line Items]      
Financing receivable credit quality indicator, the value at which relationships are reevaluated at least annually 1,000,000    
Maximum [Member] | Commercial      
Financing Receivable Investment Past Due [Line Items]      
Financing receivable credit quality indicator, the value at which relationships are reevaluated at least annually $ 3,000,000    
Florida [Member] | 1-4 single family residential      
Financing Receivable Investment Past Due [Line Items]      
Percent of loans by state 19.50% 22.00%  
Florida [Member] | New Loans | 1-4 single family residential      
Financing Receivable Investment Past Due [Line Items]      
Percent of loans by state 14.00% 14.50%  
Florida [Member] | New Loans | Commercial      
Financing Receivable Investment Past Due [Line Items]      
Percent of loans by state 43.10%