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Investment Securities - Summary of Amortized Cost and Estimated Fair Value of Investment Securities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]    
Amortized Cost, Available-for-sale $ 2,259,505 $ 3,083,582
Gross Unrealized Holding Gain, Available-for-sale 53,217 65,754
Gross Unrealized Holding Loss, Available-for-sale (1) (12,178)
Fair Value, Available-for-sale $ 2,312,721 $ 3,137,158
Total Percent, Available-for-sale 100.00% 100.00%
Amortized Cost, Held-to-maturity $ 869,650 $ 1,528
Gross Unrealized Holding Gain, Held-to-maturity 6,929 649
Gross Unrealized Holding Loss, Held-to-maturity (196) 0
Fair Value, Held-to-maturity $ 876,383 $ 2,177
Total Percent, Held-to-maturity 100.00% 100.00%
CMO's/REMIC's - Residential [Member]    
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]    
Amortized Cost, Available-for-sale $ 380,260 $ 297,318
Gross Unrealized Holding Gain, Available-for-sale 8,237 7,050
Gross Unrealized Holding Loss, Available-for-sale 0 (277)
Fair Value, Available-for-sale $ 388,497 $ 304,091
Total Percent, Available-for-sale 16.80% 9.69%
Amortized Cost, Held-to-maturity $ 1,348 $ 1,528
Gross Unrealized Holding Gain, Held-to-maturity 589 649
Gross Unrealized Holding Loss, Held-to-maturity 0 0
Fair Value, Held-to-maturity $ 1,937 $ 2,177
Total Percent, Held-to-maturity 0.15% 100.00%
Municipal Bonds [Member]    
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]    
Amortized Cost, Available-for-sale $ 182,849 $ 557,823
Gross Unrealized Holding Gain, Available-for-sale 4,049 22,463
Gross Unrealized Holding Loss, Available-for-sale 0 (645)
Fair Value, Available-for-sale $ 186,898 $ 579,641
Total Percent, Available-for-sale 8.08% 18.48%
Amortized Cost, Held-to-maturity $ 332,105  
Gross Unrealized Holding Gain, Held-to-maturity 1,635  
Gross Unrealized Holding Loss, Held-to-maturity (196)  
Fair Value, Held-to-maturity $ 333,544  
Total Percent, Held-to-maturity 38.19%  
Government Agency/GSEs [Member]    
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]    
Amortized Cost, Available-for-sale $ 20,753 $ 339,071
Gross Unrealized Holding Gain, Available-for-sale 16 0
Gross Unrealized Holding Loss, Available-for-sale (1) (8,228)
Fair Value, Available-for-sale $ 20,768 $ 330,843
Total Percent, Available-for-sale 0.90% 10.55%
Amortized Cost, Held-to-maturity $ 297,204  
Gross Unrealized Holding Gain, Held-to-maturity 3,321  
Gross Unrealized Holding Loss, Held-to-maturity 0  
Fair Value, Held-to-maturity $ 300,525  
Total Percent, Held-to-maturity 34.18%  
Residential Mortgage-backed Securities [Member]    
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]    
Amortized Cost, Available-for-sale $ 1,670,643 $ 1,884,370
Gross Unrealized Holding Gain, Available-for-sale 40,902 36,154
Gross Unrealized Holding Loss, Available-for-sale 0 (3,028)
Fair Value, Available-for-sale $ 1,711,545 $ 1,917,496
Total Percent, Available-for-sale 74.00% 61.12%
Amortized Cost, Held-to-maturity $ 238,993  
Gross Unrealized Holding Gain, Held-to-maturity 1,384  
Gross Unrealized Holding Loss, Held-to-maturity 0  
Fair Value, Held-to-maturity $ 240,377  
Total Percent, Held-to-maturity 27.48%  
Other Securities [Member]    
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]    
Amortized Cost, Available-for-sale $ 5,000 $ 5,000
Gross Unrealized Holding Gain, Available-for-sale 13 87
Gross Unrealized Holding Loss, Available-for-sale 0 0
Fair Value, Available-for-sale $ 5,013 $ 5,087
Total Percent, Available-for-sale 0.22% 0.16%