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Securities Available for Sale (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 731,748 $ 723,401
Gross Unrealized Gains 6,243 5,043
Gross Unrealized Losses (12,762) (22,693)
Estimated Fair Value 725,229 705,751
GSE collateralized mortgage obligations
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 283,963 286,608
Gross Unrealized Gains 1,509 1,104
Gross Unrealized Losses (6,118) (13,611)
Estimated Fair Value 279,354 274,101
GSE mortgage-backed securities
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 420,159 409,165
Gross Unrealized Gains 4,352 3,620
Gross Unrealized Losses (5,550) (7,789)
Estimated Fair Value 418,961 404,996
Trust preferred securities
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 4,520 4,516
Gross Unrealized Gains 0 0
Gross Unrealized Losses (720) (819)
Estimated Fair Value 3,800 3,697
Municipal bonds
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 5,681 5,687
Gross Unrealized Gains 382 319
Gross Unrealized Losses (44) (70)
Estimated Fair Value 6,019 5,936
Total Debt securities
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 714,323 705,976
Gross Unrealized Gains 6,243 5,043
Gross Unrealized Losses (12,432) (22,289)
Estimated Fair Value 708,134 688,730
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 (330) (404)
Estimated Fair Value $ 17,095 $ 17,021