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Securities Available for Sale - Aggregate Unrealized Losses and Fair Value (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2016
USD ($)
security
Mar. 31, 2015
USD ($)
Dec. 31, 2015
USD ($)
security
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions [Abstract]      
Number of Securities, Less than 12 months | security 10   61
Number of Securities, 12 months or longer | security 14   12
Number of Securities, Total | security 24   73
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]      
Fair Value - Less than 12 months $ 21,786   $ 560,758
Fair Value - 12 months or longer 111,953   102,554
Fair Value - Total 133,739   663,312
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]      
Gross Unrealized Losses - Less than 12 months (75)   (4,254)
Gross Unrealized Losses - 12 months or longer (2,378)   (4,498)
Gross Unrealized Losses - Total (2,453)   $ (8,752)
Unrealized gain on available-for-sale securities 15,592 $ 5,255  
Reclassification adjustments for gains realized in income $ 0 $ (424)  
GSE collateralized mortgage obligations      
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions [Abstract]      
Number of Securities, Less than 12 months | security [1] 1   31
Number of Securities, 12 months or longer | security [1] 9   8
Number of Securities, Total | security [1] 10   39
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]      
Fair Value - Less than 12 months [1] $ 7,098   $ 300,202
Fair Value - 12 months or longer [1] 78,032   70,857
Fair Value - Total [1] 85,130   371,059
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]      
Gross Unrealized Losses - Less than 12 months [1] (26)   (2,611)
Gross Unrealized Losses - 12 months or longer [1] (676)   (2,344)
Gross Unrealized Losses - Total [1] $ (702)   $ (4,955)
GSE mortgage-backed securities      
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions [Abstract]      
Number of Securities, Less than 12 months | security [1] 7   28
Number of Securities, 12 months or longer | security [1] 4   3
Number of Securities, Total | security [1] 11   31
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]      
Fair Value - Less than 12 months [1] $ 13,612   $ 247,160
Fair Value - 12 months or longer [1] 30,527   27,947
Fair Value - Total [1] 44,139   275,107
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]      
Gross Unrealized Losses - Less than 12 months [1] (42)   (1,487)
Gross Unrealized Losses - 12 months or longer [1] (547)   (1,358)
Gross Unrealized Losses - Total [1] $ (589)   $ (2,845)
Trust preferred securities      
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions [Abstract]      
Number of Securities, Less than 12 months | security 0   0
Number of Securities, 12 months or longer | security 1   1
Number of Securities, Total | security 1   1
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]      
Fair Value - Less than 12 months $ 0   $ 0
Fair Value - 12 months or longer 3,394   3,750
Fair Value - Total 3,394   3,750
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]      
Gross Unrealized Losses - Less than 12 months 0   0
Gross Unrealized Losses - 12 months or longer (1,155)   (796)
Gross Unrealized Losses - Total $ (1,155)   $ (796)
Municipal bonds      
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions [Abstract]      
Number of Securities, Less than 12 months | security 2   1
Number of Securities, 12 months or longer | security 0   0
Number of Securities, Total | security 2   1
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]      
Fair Value - Less than 12 months $ 1,076   $ 127
Fair Value - 12 months or longer 0   0
Fair Value - Total 1,076   127
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]      
Gross Unrealized Losses - Less than 12 months (7)   0
Gross Unrealized Losses - 12 months or longer 0   0
Gross Unrealized Losses - Total $ (7)   $ 0
Mutual funds - GSE mortgage related securities      
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions [Abstract]      
Number of Securities, Less than 12 months | security 0   1
Number of Securities, 12 months or longer | security 0   0
Number of Securities, Total | security 0   1
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]      
Fair Value - Less than 12 months $ 0   $ 13,269
Fair Value - 12 months or longer 0   0
Fair Value - Total 0   13,269
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]      
Gross Unrealized Losses - Less than 12 months 0   (156)
Gross Unrealized Losses - 12 months or longer 0   0
Gross Unrealized Losses - Total $ 0   $ (156)
Credit concentration risk | Stockholders' equity | Non-US Government and agency securities      
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]      
Maximum exposure to any single issuer 10.00%   10.00%
[1] Investments in U.S. Government agency and U.S. Government sponsored enterprises