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Fair Value Information - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps $ 637,476 $ 654,097
Level 2 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps 10,674 10,846
Interest rate swaps 10,674 10,846
Interest Rate Swaps [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps      
Carrying Value [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps 10,674 10,846
Interest rate swaps 10,674 10,846
Fair Value on Recurring Basis [Member] | Level 1 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets      
Total liabilities      
Fair Value on Recurring Basis [Member] | Level 2 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets 2,760,737 2,674,488
Total liabilities 10,674 10,846
Fair Value on Recurring Basis [Member] | Level 3 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets      
Total liabilities      
Fair Value on Recurring Basis [Member] | Government agency [Member] | Level 1 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities - AFS      
Fair Value on Recurring Basis [Member] | Government agency [Member] | Level 2 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities - AFS 316,829 326,525
Fair Value on Recurring Basis [Member] | Government agency [Member] | Level 3 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities - AFS      
Fair Value on Recurring Basis [Member] | Residential mortgage-backed securities [Member] | Level 1 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities - AFS      
Fair Value on Recurring Basis [Member] | Residential mortgage-backed securities [Member] | Level 2 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities - AFS 1,512,176 1,379,943
Fair Value on Recurring Basis [Member] | Residential mortgage-backed securities [Member] | Level 3 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities - AFS      
Fair Value on Recurring Basis [Member] | CMO's / REMIC's - residential [Member] | Level 1 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities - AFS      
Fair Value on Recurring Basis [Member] | CMO's / REMIC's - residential [Member] | Level 2 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities - AFS 351,373 366,175
Fair Value on Recurring Basis [Member] | CMO's / REMIC's - residential [Member] | Level 3 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities - AFS      
Fair Value on Recurring Basis [Member] | Municipal bonds [Member] | Level 1 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities - AFS      
Fair Value on Recurring Basis [Member] | Municipal bonds [Member] | Level 2 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities - AFS 564,685 586,091
Fair Value on Recurring Basis [Member] | Municipal bonds [Member] | Level 3 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities - AFS      
Fair Value on Recurring Basis [Member] | Other securities [Member] | Level 1 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities - AFS      
Fair Value on Recurring Basis [Member] | Other securities [Member] | Level 2 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities - AFS 5,000 4,908
Fair Value on Recurring Basis [Member] | Other securities [Member] | Level 3 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities - AFS      
Fair Value on Recurring Basis [Member] | Investment securities - AFS [Member] | Level 1 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities - AFS      
Fair Value on Recurring Basis [Member] | Investment securities - AFS [Member] | Level 2 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities - AFS 2,750,063 2,663,642
Fair Value on Recurring Basis [Member] | Investment securities - AFS [Member] | Level 3 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities - AFS      
Fair Value on Recurring Basis [Member] | Interest Rate Swaps [Member] | Level 1 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps      
Interest rate swaps      
Fair Value on Recurring Basis [Member] | Interest Rate Swaps [Member] | Level 2 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps 10,674 10,846
Interest rate swaps 10,674 10,846
Fair Value on Recurring Basis [Member] | Interest Rate Swaps [Member] | Level 3 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps      
Interest rate swaps      
Fair Value on Recurring Basis [Member] | Carrying Value [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets 2,760,737 2,674,488
Total liabilities 10,674 10,846
Fair Value on Recurring Basis [Member] | Carrying Value [Member] | Government agency [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities - AFS 316,829 326,525
Fair Value on Recurring Basis [Member] | Carrying Value [Member] | Residential mortgage-backed securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities - AFS 1,512,176 1,379,943
Fair Value on Recurring Basis [Member] | Carrying Value [Member] | CMO's / REMIC's - residential [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities - AFS 351,373 366,175
Fair Value on Recurring Basis [Member] | Carrying Value [Member] | Municipal bonds [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities - AFS 564,685 586,091
Fair Value on Recurring Basis [Member] | Carrying Value [Member] | Other securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities - AFS 5,000 4,908
Fair Value on Recurring Basis [Member] | Carrying Value [Member] | Investment securities - AFS [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities - AFS 2,750,063 2,663,642
Fair Value on Recurring Basis [Member] | Carrying Value [Member] | Interest Rate Swaps [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps 10,674 10,846
Interest rate swaps $ 10,674 $ 10,846