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Securities Available for Sale - Amortized Cost and Estimated Fair Value (Details) (USD $)
Dec. 31, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost - Due within one year $ 0  
Amortized Cost - Due after one year through five years 340,000  
Amortized Cost - Due after five years through ten years 3,883,000  
Amortized Cost - Due after ten years 5,980,000  
Amortized Cost 723,401,000 689,016,000
Estimated Fair Value - Due within one year 0  
Estimated Fair Value - Due after one year through five years 350,000  
Estimated Fair Value - Due after five years through ten years 4,170,000  
Estimated Fair Value - Due after ten years 5,113,000  
Estimated Fair Value 705,751,000 704,403,000
Available-for-sale securities, restricted 360,600,000 338,600,000
Collateralized mortgage obligations
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 286,608,000  
Amortized Cost 286,608,000 249,373,000
Estimated Fair Value 274,101,000  
Estimated Fair Value 274,101,000 254,912,000
Mortgage-backed securities
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 409,165,000  
Amortized Cost 409,165,000 415,925,000
Estimated Fair Value 404,996,000  
Estimated Fair Value 404,996,000 425,540,000
Mutual funds
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 17,425,000  
Amortized Cost 17,425,000 14,710,000
Estimated Fair Value 17,021,000  
Estimated Fair Value $ 17,021,000 $ 14,996,000