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Securities Available for Sale - Aggregate Unrealized Losses and Fair Value (Details) (USD $)
3 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2014
security
Mar. 31, 2013
Dec. 31, 2013
security
Mar. 31, 2014
GSE collateralized mortgage obligations
security
Dec. 31, 2013
GSE collateralized mortgage obligations
security
Mar. 31, 2014
GSE mortgage-backed securities
security
Dec. 31, 2013
GSE mortgage-backed securities
security
Mar. 31, 2014
Trust preferred securities
security
Dec. 31, 2013
Trust preferred securities
security
Mar. 31, 2014
Municipal bonds
security
Mar. 31, 2014
Mutual funds - GSE mortgage related securities
security
Dec. 31, 2013
Mutual funds - GSE mortgage related securities
security
Mar. 31, 2014
Credit concentration risk
Stockholders' equity
Non-US Government and agency securities
Dec. 31, 2013
Credit concentration risk
Stockholders' equity
Non-US Government and agency securities
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions [Abstract]                            
Number of Securities, Less than 12 months 31   52 10 [1] 21 [1] 19 [1] 29 [1] 0 1 1 1 1    
Number of Securities, 12 months or longer 20   11 9 [1] 3 [1] 10 [1] 7 [1] 1 1 0 0 0    
Number of Securities, Total 51   63 19 [1] 24 [1] 29 [1] 36 [1] 1 2 1 1 1    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]                            
Fair Value - Less than 12 months $ 264,036,000   $ 416,122,000 $ 103,382,000 [1] $ 198,713,000 [1] $ 146,427,000 [1] $ 203,276,000 [1] $ 0 $ 1,112,000 $ 1,132,000 $ 13,095,000 $ 13,021,000    
Fair Value - 12 months or longer 139,479,000   31,871,000 94,998,000 [1] 13,381,000 [1] 40,681,000 [1] 14,793,000 [1] 3,800,000 3,697,000 0 0 0    
Fair Value - Total 403,515,000   447,993,000 198,380,000 [1] 212,094,000 [1] 187,108,000 [1] 218,069,000 [1] 3,800,000 4,809,000 1,132,000 13,095,000 13,021,000    
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]                            
Gross Unrealized Losses - Less than 12 months (5,347,000)   (20,227,000) (2,408,000) [1] (12,460,000) [1] (2,565,000) [1] (7,293,000) [1] 0 (70,000) (44,000) (330,000) (404,000)    
Gross Unrealized Losses - 12 months or longer (7,415,000)   (2,466,000) (3,710,000) [1] (1,151,000) [1] (2,985,000) [1] (496,000) [1] (720,000) (819,000) 0 0 0    
Gross Unrealized Losses - Total (12,762,000)   (22,693,000) (6,118,000) [1] (13,611,000) [1] (5,550,000) [1] (7,789,000) [1] (720,000) (889,000) (44,000) (330,000) (404,000)    
Maximum exposure to any single issuer                         10.00% 10.00%
Gross unrealized gains (losses) included in accumulated other comprehensive income during the period 11,100,000 (3,700,000)                        
Reclassification out of accumulated other comprehensive income as a result of securities being sold $ 0 $ 54,000                        
[1] Investments in U.S. Government agency and U.S. Government sponsored enterprises