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Investment Securities Narrative (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
Security
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
Security
Sep. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Schedule of Investments [Line Items]          
Available-for-sale Securities Pledged as Collateral $ 1,800,000   $ 1,800,000   $ 1,700,000
Amortized cost 2,424,164   2,424,164   2,312,087
Available-for-sale Securities, Gross Realized Gain (Loss) 1,730 $ 81 8,290 $ 1,193  
Available-for-sale Securities, Fair Value Disclosure 2,436,337   2,436,337   2,323,371
Single Bank Stock Investment, cost basis 8,500   8,500    
Single Bank Stock Investment, Fair Value $ 12,800   $ 12,800    
Percent Ownership In An Individual Financial Institution 57.10%   57.10%    
IndividualBankStockInvestmentPercenttoTotalPortfolio 5.00%   5.00%    
Auction Rate Certificates Not Subject To Any Additional Other Than Temporary Impairment Charges Fair Value $ 97,900   $ 97,900    
Domestic Corporate debt securities 99,900   99,900    
Equity Securities [Member]          
Schedule of Investments [Line Items]          
Amortized cost 16,087   16,087   33,469
Available-for-sale Securities, Gross Realized Gain (Loss) 1,730 $ 99 5,990 $ 88  
Available-for-sale Securities, Fair Value Disclosure 23,532   23,532   47,623
Equity Securities Financial Institution [Member]          
Schedule of Investments [Line Items]          
Available-for-sale Securities, Equity Securities 22,400   22,400   41,800
Amortized cost 15,100   15,100    
Available-for-sale Securities, Fair Value Disclosure 22,400   22,400    
Equity Securities, Other [Member]          
Schedule of Investments [Line Items]          
Available-for-sale Securities, Equity Securities 1,100   1,100    
Auction Rate Securities [Member]          
Schedule of Investments [Line Items]          
Amortized cost 106,661   106,661   108,751
Available-for-sale Securities, Fair Value Disclosure 97,873   97,873   $ 100,941
Pooled Trust Preferred Securities [Member]          
Schedule of Investments [Line Items]          
Amortized cost $ 1,900   1,900    
Available-for-sale Securities, Gross Realized Gain (Loss)     $ 2,300    
Number of Securities Sold | Security     3    
Single-issuer Trust Preferred Securities [Member]          
Schedule of Investments [Line Items]          
Unrealized Loss on Securities     $ 4,800    
Number of Trust Preferred Securities | Security 19   19    
Moody's, A2 Rating [Member] | Auction Rate Securities [Member]          
Schedule of Investments [Line Items]          
Carrying Value Auction Rate Securities Rated Investment Grade $ 92,000   $ 92,000    
Percentage Auction Rate Securities Investment Grade 94.00%   94.00%    
Moody's, A3 Rating [Member] | Auction Rate Securities [Member]          
Schedule of Investments [Line Items]          
Carrying Value Auction Rate Securities Rated Investment Grade $ 5,000   $ 5,000    
Percentage Auction Rate Securities Investment Grade 6.00%   6.00%    
External Credit Rating, BBB [Member] | Single-issuer Trust Preferred Securities [Member]          
Schedule of Investments [Line Items]          
Amortized cost $ 3,700   $ 3,700    
Available-for-sale Securities, Fair Value Disclosure 2,700   2,700    
External Credit Rating, Rated Below Investment Grade [Member] | Pooled Trust Preferred Securities [Member]          
Schedule of Investments [Line Items]          
Amortized cost 0   0    
Available-for-sale Securities, Fair Value Disclosure 530   530    
External Credit Rating, Rated Below Investment Grade [Member] | Single-issuer Trust Preferred Securities [Member]          
Schedule of Investments [Line Items]          
Amortized cost 14,500   14,500    
Available-for-sale Securities, Fair Value Disclosure $ 13,200   $ 13,200    
Number of Trust Preferred Securities | Security 7   7