XML 16 R48.htm IDEA: XBRL DOCUMENT v2.4.0.8
Impairment of Investment Securities - Schedule of Unrealized Losses and Estimated Fair Values (Detail) (USD $)
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Estimated Fair Value, Less Than 12 Months $ 703,866,000   $ 820,209,000
Grous Unrealized Losses Less Than 12 Months (13,351,000) (24,588,000)  
Estimated Fair Value, 12 Months or More 199,201,000   110,947,000
Gross Unrealized Losses 12 Months or More (22,359,000) (23,078,000)  
Total Estimated Fair Value 903,067,000   931,156,000
Total Gross Unrealized Losses (35,710,000) (47,666,000)  
US Government Agencies Residential Mortgage-backed Securities [Member]
      
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Estimated Fair Value, Less Than 12 Months 2,044,000   2,035,000
Grous Unrealized Losses Less Than 12 Months (34,000) (59,000)  
Estimated Fair Value, 12 Months or More 0   0
Gross Unrealized Losses 12 Months or More 0 0  
Total Estimated Fair Value 2,044,000   2,035,000
Total Gross Unrealized Losses (34,000) (59,000)  
Obligations of U.S. Government-Sponsored Enterprises - Mortgage-Backed Securities - Residential [Member]
      
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Estimated Fair Value, Less Than 12 Months 459,224,000   632,231,000
Grous Unrealized Losses Less Than 12 Months (11,805,000) (22,844,000)  
Estimated Fair Value, 12 Months or More 149,391,000   65,324,000
Gross Unrealized Losses 12 Months or More (7,667,000) (4,319,000)  
Total Estimated Fair Value 608,615,000   697,555,000
Total Gross Unrealized Losses (19,472,000) (27,163,000)  
Obligations of U.S. Government-Sponsored Enterprises - Other Government-Sponsored Enterprises [Member]
      
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Estimated Fair Value, Less Than 12 Months 237,136,000   183,542,000
Grous Unrealized Losses Less Than 12 Months (1,452,000) (1,448,000)  
Estimated Fair Value, 12 Months or More 24,570,000   24,501,000
Gross Unrealized Losses 12 Months or More (411,000) (479,000)  
Total Estimated Fair Value 261,706,000   208,043,000
Total Gross Unrealized Losses (1,863,000) (1,927,000)  
Obligations of States and Political Subdivisions [Member]
      
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Estimated Fair Value, Less Than 12 Months 2,825,000    
Grous Unrealized Losses Less Than 12 Months (3,000)    
Estimated Fair Value, 12 Months or More 0    
Gross Unrealized Losses 12 Months or More 0    
Total Estimated Fair Value 2,825,000    
Total Gross Unrealized Losses (3,000)    
Pooled Trust Preferred Collateralized Debt Obligations [Member]
      
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Estimated Fair Value, Less Than 12 Months 2,637,000   2,401,000
Grous Unrealized Losses Less Than 12 Months (57,000) (237,000)  
Estimated Fair Value, 12 Months or More 25,240,000   21,122,000
Gross Unrealized Losses 12 Months or More (14,281,000) (18,280,000)  
Total Estimated Fair Value 27,877,000   23,523,000
Total Gross Unrealized Losses (14,338,000) (18,517,000)  
Equity Securities [Member]
      
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Total Estimated Fair Value $ 0 $ 0