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Securities (Securities Portfolio) (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Investment [Line Items]    
Securities Available-for-Sale, Amortized Cost $ 1,549,803 $ 1,709,817
Securities Available-for-Sale, Gross Unrealized Gains 76,181 73,813
Securities Available-for-Sale, Gross Unrealized Losses (335) (165)
Securities Available-for-Sale, Fair Value 1,625,649 1,783,465
Securities Held-to-Maturity, Amortized Cost 693,277 490,143
Securities Held-to-Maturity, Gross Unrealized Gains 13,550 3,172
Securities Held-to-Maturity, Gross Unrealized Losses (79) (85)
Securities Held-to-Maturity, Fair Value 706,748 493,230
Non-Marketable Equity Investments, Amortized Cost 47,702 43,604
Non-Marketable Equity Investments, Fair Value 47,702 43,604
Federal Home Loan Bank Certificates and Obligations (FHLB) [Member]
   
Investment [Line Items]    
Non-Marketable Equity Investments, Amortized Cost 43,467 40,695
Non-Marketable Equity Investments, Fair Value 43,467 40,695
Equity Securities, Other [Member]
   
Investment [Line Items]    
Non-Marketable Equity Investments, Amortized Cost 4,235 2,909
Non-Marketable Equity Investments, Fair Value 4,235 2,909
Residential Mortgage Backed Securities [Member]
   
Investment [Line Items]    
Securities Available-for-Sale, Amortized Cost 983,811 1,140,555
Securities Available-for-Sale, Gross Unrealized Gains 50,302 48,660
Securities Available-for-Sale, Gross Unrealized Losses   (2)
Securities Available-for-Sale, Fair Value 1,034,113 1,189,213
Securities Held-to-Maturity, Amortized Cost 675,211 490,072
Securities Held-to-Maturity, Gross Unrealized Gains 13,365 3,172
Securities Held-to-Maturity, Gross Unrealized Losses (79) (85)
Securities Held-to-Maturity, Fair Value 688,497 493,159
Commercial Mortgage Backed Securities [Member]
   
Investment [Line Items]    
Securities Held-to-Maturity, Amortized Cost 17,495  
Securities Held-to-Maturity, Gross Unrealized Gains 185  
Securities Held-to-Maturity, Fair Value 17,680  
State And Municipal [Member]
   
Investment [Line Items]    
Securities Available-for-Sale, Amortized Cost 186,029 154,080
Securities Available-for-Sale, Gross Unrealized Gains 11,690 12,140
Securities Available-for-Sale, Gross Unrealized Losses (203) (23)
Securities Available-for-Sale, Fair Value 197,516 166,197
Securities Held-to-Maturity, Amortized Cost 571 71
Securities Held-to-Maturity, Fair Value 571 71
US Treasury Securities [Member]
   
Investment [Line Items]    
Securities Available-for-Sale, Amortized Cost 87,286 60,590
Securities Available-for-Sale, Gross Unrealized Gains 966 931
Securities Available-for-Sale, Fair Value 88,252 61,521
US Government Agencies Debt Securities [Member]
   
Investment [Line Items]    
Securities Available-for-Sale, Amortized Cost   10,014
Securities Available-for-Sale, Gross Unrealized Gains   20
Securities Available-for-Sale, Fair Value   10,034
Collateralized Mortgage Obligations [Member]
   
Investment [Line Items]    
Securities Available-for-Sale, Amortized Cost 292,177 344,078
Securities Available-for-Sale, Gross Unrealized Gains 13,223 12,062
Securities Available-for-Sale, Gross Unrealized Losses (132) (140)
Securities Available-for-Sale, Fair Value 305,268 356,000
Foreign Government Debt Securities [Member]
   
Investment [Line Items]    
Securities Available-for-Sale, Amortized Cost 500 500
Securities Available-for-Sale, Fair Value $ 500 $ 500