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Securities Available for Sale (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 746,537 $ 723,401
Gross Unrealized Gains 8,952 5,043
Gross Unrealized Losses (8,806) (22,693)
Estimated Fair Value 746,683 705,751
GSE collateralized mortgage obligations
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 291,676 286,608
Gross Unrealized Gains 1,564 1,104
Gross Unrealized Losses (5,102) (13,611)
Estimated Fair Value 288,138 274,101
GSE mortgage-backed securities
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 427,237 409,165
Gross Unrealized Gains 6,940 3,620
Gross Unrealized Losses (2,983) (7,789)
Estimated Fair Value 431,194 404,996
Trust preferred securities
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 4,524 4,516
Gross Unrealized Gains 0 0
Gross Unrealized Losses (536) (819)
Estimated Fair Value 3,988 3,697
Municipal bonds
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 5,675 5,687
Gross Unrealized Gains 448 319
Gross Unrealized Losses (29) (70)
Estimated Fair Value 6,094 5,936
Total Debt securities
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 729,112 705,976
Gross Unrealized Gains 8,952 5,043
Gross Unrealized Losses (8,650) (22,289)
Estimated Fair Value 729,414 688,730
Mutual funds - GSE mortgage related securities
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 17,425 17,425
Gross Unrealized Gains 0 0
Gross Unrealized Losses (156) (404)
Estimated Fair Value $ 17,269 $ 17,021