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Securities Available for Sale - Aggregate Unrealized Losses and Fair Value (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2017
USD ($)
security
Mar. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
security
Number of Securities      
Number of Securities, Less than 12 months | security 186   222
Number of Securities, 12 months or longer | security 6   5
Number of Securities, Total | security 192   227
Fair Value      
Fair Value - Less than 12 months $ 1,302,740,000   $ 1,328,003,000
Fair Value - 12 months or longer 39,665,000   40,446,000
Fair Value - Total 1,342,405,000   1,368,449,000
Gross Unrealized Losses      
Gross Unrealized Losses - Less than 12 months (23,277,000)   (25,760,000)
Gross Unrealized Losses - 12 months or longer (1,396,000)   (1,651,000)
Gross Unrealized Losses - Total (24,673,000)   $ (27,411,000)
Change in unrealized net holding gains on securities available for sale $ 3,181,000 $ 15,633,000  
US Government Agencies Debt Securities [Member]      
Number of Securities      
Number of Securities, Less than 12 months | security [1] 3    
Number of Securities, 12 months or longer | security [1] 0    
Number of Securities, Total | security [1] 3    
Fair Value      
Fair Value - Less than 12 months [1] $ 9,998,000    
Fair Value - 12 months or longer [1] 0    
Fair Value - Total [1] 9,998,000    
Gross Unrealized Losses      
Gross Unrealized Losses - Less than 12 months [1] (4,000)    
Gross Unrealized Losses - 12 months or longer [1] 0    
Gross Unrealized Losses - Total [1] $ (4,000)    
GSE collateralized mortgage obligations      
Number of Securities      
Number of Securities, Less than 12 months | security [1] 67   66
Number of Securities, 12 months or longer | security [1] 4   4
Number of Securities, Total | security [1] 71   70
Fair Value      
Fair Value - Less than 12 months [1] $ 624,327,000   $ 615,803,000
Fair Value - 12 months or longer [1] 34,843,000   36,333,000
Fair Value - Total [1] 659,170,000   652,136,000
Gross Unrealized Losses      
Gross Unrealized Losses - Less than 12 months [1] (8,668,000)   (9,459,000)
Gross Unrealized Losses - 12 months or longer [1] (1,119,000)   (1,204,000)
Gross Unrealized Losses - Total [1] (9,787,000)   $ (10,663,000)
OTTI recognized $ 0    
GSE mortgage-backed securities      
Number of Securities      
Number of Securities, Less than 12 months | security [1] 59   57
Number of Securities, 12 months or longer | security [1] 0   0
Number of Securities, Total | security [1] 59   57
Fair Value      
Fair Value - Less than 12 months [1] $ 606,378,000   $ 622,797,000
Fair Value - 12 months or longer [1] 0   0
Fair Value - Total [1] 606,378,000   622,797,000
Gross Unrealized Losses      
Gross Unrealized Losses - Less than 12 months [1] (13,214,000)   (14,395,000)
Gross Unrealized Losses - 12 months or longer [1] 0   0
Gross Unrealized Losses - Total [1] (13,214,000)   $ (14,395,000)
OTTI recognized $ 0    
Trust preferred securities      
Number of Securities      
Number of Securities, Less than 12 months | security 0   1
Number of Securities, 12 months or longer | security 1   1
Number of Securities, Total | security 1   2
Fair Value      
Fair Value - Less than 12 months $ 0   $ 7,014,000
Fair Value - 12 months or longer 4,313,000   4,113,000
Fair Value - Total 4,313,000   11,127,000
Gross Unrealized Losses      
Gross Unrealized Losses - Less than 12 months 0   (2,000)
Gross Unrealized Losses - 12 months or longer (251,000)   (447,000)
Gross Unrealized Losses - Total (251,000)   $ (449,000)
OTTI recognized $ 0    
Municipal bonds      
Number of Securities      
Number of Securities, Less than 12 months | security 54   95
Number of Securities, 12 months or longer | security 1   0
Number of Securities, Total | security 55   95
Fair Value      
Fair Value - Less than 12 months $ 50,447,000   $ 69,331,000
Fair Value - 12 months or longer 509,000   0
Fair Value - Total 50,956,000   69,331,000
Gross Unrealized Losses      
Gross Unrealized Losses - Less than 12 months (1,018,000)   (1,537,000)
Gross Unrealized Losses - 12 months or longer (26,000)   0
Gross Unrealized Losses - Total $ (1,044,000)   $ (1,537,000)
Mutual funds - GSE mortgage related securities      
Number of Securities      
Number of Securities, Less than 12 months | security 3   3
Number of Securities, 12 months or longer | security 0   0
Number of Securities, Total | security 3   3
Fair Value      
Fair Value - Less than 12 months $ 11,590,000   $ 13,058,000
Fair Value - 12 months or longer 0   0
Fair Value - Total 11,590,000   13,058,000
Gross Unrealized Losses      
Gross Unrealized Losses - Less than 12 months (373,000)   (367,000)
Gross Unrealized Losses - 12 months or longer 0   0
Gross Unrealized Losses - Total $ (373,000)   $ (367,000)
Credit concentration risk | Stockholders' equity | Non-US Government and agency securities      
Gross Unrealized Losses      
Maximum exposure to any single issuer 10.00%   10.00%
[1] Investments in U.S. Government agency and U.S. Government sponsored enterprises