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Securities Available for Sale - Aggregate Unrealized Losses and Fair Value (Details)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2016
USD ($)
security
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
security
Jun. 30, 2015
USD ($)
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 6   6   61
Number of Securities, 12 months or longer | security 9   9   12
Number of Securities, Total | security 15   15   73
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]          
Fair Value - Less than 12 months $ 23,619   $ 23,619   $ 560,758
Fair Value - 12 months or longer 75,589   75,589   102,554
Fair Value - Total 99,208   99,208   663,312
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]          
Gross Unrealized Losses - Less than 12 months (92)   (92)   (4,254)
Gross Unrealized Losses - 12 months or longer (1,121)   (1,121)   (4,498)
Gross Unrealized Losses - Total (1,213)   (1,213)   $ (8,752)
Unrealized gain on available-for-sale securities 6,603 $ (8,446) 22,194 $ (3,191)  
Reclassification adjustments for gains realized in income $ 0 $ 0 $ 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   1   31
Number of Securities, 12 months or longer | security [1] 4   4   8
Number of Securities, Total | security [1] 5   5   39
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]          
Fair Value - Less than 12 months [1] $ 15,337   $ 15,337   $ 300,202
Fair Value - 12 months or longer [1] 41,563   41,563   70,857
Fair Value - Total [1] 56,900   56,900   371,059
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]          
Gross Unrealized Losses - Less than 12 months [1] (44)   (44)   (2,611)
Gross Unrealized Losses - 12 months or longer [1] (141)   (141)   (2,344)
Gross Unrealized Losses - Total [1] $ (185)   $ (185)   $ (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] 4   4   28
Number of Securities, 12 months or longer | security [1] 4   4   3
Number of Securities, Total | security [1] 8   8   31
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]          
Fair Value - Less than 12 months [1] $ 7,747   $ 7,747   $ 247,160
Fair Value - 12 months or longer [1] 30,313   30,313   27,947
Fair Value - Total [1] 38,060   38,060   275,107
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]          
Gross Unrealized Losses - Less than 12 months [1] (46)   (46)   (1,487)
Gross Unrealized Losses - 12 months or longer [1] (140)   (140)   (1,358)
Gross Unrealized Losses - Total [1] $ (186)   $ (186)   $ (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   0
Number of Securities, 12 months or longer | security 1   1   1
Number of Securities, Total | security 1   1   1
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]          
Fair Value - Less than 12 months $ 0   $ 0   $ 0
Fair Value - 12 months or longer 3,713   3,713   3,750
Fair Value - Total 3,713   3,713   3,750
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]          
Gross Unrealized Losses - Less than 12 months 0   0   0
Gross Unrealized Losses - 12 months or longer (840)   (840)   (796)
Gross Unrealized Losses - Total $ (840)   $ (840)   $ (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 1   1   1
Number of Securities, 12 months or longer | security 0   0   0
Number of Securities, Total | security 1   1   1
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]          
Fair Value - Less than 12 months $ 535   $ 535   $ 127
Fair Value - 12 months or longer 0   0   0
Fair Value - Total 535   535   127
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]          
Gross Unrealized Losses - Less than 12 months (2)   (2)   0
Gross Unrealized Losses - 12 months or longer 0   0   0
Gross Unrealized Losses - Total $ (2)   $ (2)   $ 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   0   1
Number of Securities, 12 months or longer | security 0   0   0
Number of Securities, Total | security 0   0   1
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]          
Fair Value - Less than 12 months $ 0   $ 0   $ 13,269
Fair Value - 12 months or longer 0   0   0
Fair Value - Total 0   0   13,269
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]          
Gross Unrealized Losses - Less than 12 months 0   0   (156)
Gross Unrealized Losses - 12 months or longer 0   0   0
Gross Unrealized Losses - Total $ 0   $ 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