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Securities Available for Sale (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 723,401 $ 689,016
Gross Unrealized Gains 5,043 16,824
Gross Unrealized Losses (22,693) (1,437)
Estimated Fair Value 705,751 704,403
Amount of other than temporary impairment loss recognized 0  
Collateralized mortgage obligations
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 286,608 249,373
Gross Unrealized Gains 1,104 5,649
Gross Unrealized Losses (13,611) (110)
Estimated Fair Value 274,101 254,912
Mortgage-backed securities
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 409,165 415,925
Gross Unrealized Gains 3,620 10,277
Gross Unrealized Losses (7,789) (662)
Estimated Fair Value 404,996 425,540
Trust preferred securities
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 4,516 4,502
Gross Unrealized Gains 0 0
Gross Unrealized Losses (819) (665)
Estimated Fair Value 3,697 3,837
Municipal bonds
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 5,687 4,506
Gross Unrealized Gains 319 612
Gross Unrealized Losses (70) 0
Estimated Fair Value 5,936 5,118
Total debt securities
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 705,976 674,306
Gross Unrealized Gains 5,043 16,538
Gross Unrealized Losses (22,289) (1,437)
Estimated Fair Value 688,730 689,407
Mutual funds
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 17,425 14,710
Gross Unrealized Gains 0 286
Gross Unrealized Losses (404) 0
Estimated Fair Value $ 17,021 $ 14,996
Credit concentration risk | Stockholders' equity | Non-US government and agency securities
    
Schedule of Available-for-sale Securities [Line Items]    
Maximum exposure to any single issuer 10.00% 10.00%