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Securities - Securities In An Unrealized Loss Position (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
security
Dec. 31, 2017
USD ($)
security
Securities in An Unrealized Loss Position [Line Items]    
Number of Securities | security 882  
Number of Securities | security   656
Fair Value    
Fair Value - Less Than 12 Months $ 501,061  
Fair Value - Less Than 12 Months   $ 613,975
Fair Value - 12 Months or Longer 1,365,068  
Fair Value - 12 Months or Longer   1,015,438
Fair Value - Total 1,866,129  
Fair Value - Total   1,629,413
Unrealized Losses    
Unrealized Losses - Less Than 12 Months 8,046  
Unrealized Losses - Less Than 12 Months   5,247
Unrealized Losses - 12 Months or Longer 36,270  
Unrealized Losses - 12 Months or Longer   19,776
Unrealized Losses - Total $ 44,316  
Unrealized Losses - Total   $ 25,023
U.S. treasury securities    
Securities in An Unrealized Loss Position [Line Items]    
Number of Securities | security 17  
Number of Securities | security   20
Fair Value    
Fair Value - Less Than 12 Months $ 15,894  
Fair Value - Less Than 12 Months   $ 19,918
Fair Value - 12 Months or Longer 13,886  
Fair Value - 12 Months or Longer   26,427
Fair Value - Total 29,780  
Fair Value - Total   46,345
Unrealized Losses    
Unrealized Losses - Less Than 12 Months 57  
Unrealized Losses - Less Than 12 Months   87
Unrealized Losses - 12 Months or Longer 118  
Unrealized Losses - 12 Months or Longer   97
Unrealized Losses - Total $ 175  
Unrealized Losses - Total   $ 184
U.S. agency securities    
Securities in An Unrealized Loss Position [Line Items]    
Number of Securities | security 74  
Number of Securities | security   72
Fair Value    
Fair Value - Less Than 12 Months $ 34,263  
Fair Value - Less Than 12 Months   $ 66,899
Fair Value - 12 Months or Longer 93,227  
Fair Value - 12 Months or Longer   58,021
Fair Value - Total 127,490  
Fair Value - Total   124,920
Unrealized Losses    
Unrealized Losses - Less Than 12 Months 320  
Unrealized Losses - Less Than 12 Months   300
Unrealized Losses - 12 Months or Longer 1,287  
Unrealized Losses - 12 Months or Longer   686
Unrealized Losses - Total $ 1,607  
Unrealized Losses - Total   $ 986
CMOs    
Securities in An Unrealized Loss Position [Line Items]    
Number of Securities | security 234  
Number of Securities | security   211
Fair Value    
Fair Value - Less Than 12 Months $ 171,901  
Fair Value - Less Than 12 Months   $ 365,131
Fair Value - 12 Months or Longer 863,747  
Fair Value - 12 Months or Longer   633,227
Fair Value - Total 1,035,648  
Fair Value - Total   998,358
Unrealized Losses    
Unrealized Losses - Less Than 12 Months 1,671  
Unrealized Losses - Less Than 12 Months   3,265
Unrealized Losses - 12 Months or Longer 23,013  
Unrealized Losses - 12 Months or Longer   14,689
Unrealized Losses - Total $ 24,684  
Unrealized Losses - Total   $ 17,954
MBSs    
Securities in An Unrealized Loss Position [Line Items]    
Number of Securities | security 118  
Number of Securities | security   86
Fair Value    
Fair Value - Less Than 12 Months $ 135,791  
Fair Value - Less Than 12 Months   $ 126,136
Fair Value - 12 Months or Longer 284,273  
Fair Value - 12 Months or Longer   210,017
Fair Value - Total 420,064  
Fair Value - Total   336,153
Unrealized Losses    
Unrealized Losses - Less Than 12 Months 1,715  
Unrealized Losses - Less Than 12 Months   902
Unrealized Losses - 12 Months or Longer 9,536  
Unrealized Losses - 12 Months or Longer   3,432
Unrealized Losses - Total $ 11,251  
Unrealized Losses - Total   $ 4,334
Municipal securities    
Schedule of Held-to-Maturity Securities [Line Items]    
Number of Securities | security 5 8
Fair Value - Less than 12 Months $ 0 $ 0
Unrealized Losses - Less than 12 Months 0 0
Fair Value - 12 Months or Longer 9,871 12,013
Unrealized Losses - 12 Months or Longer 305 1,747
Fair Value - Total 9,871 12,013
Unrealized Losses - Total $ 305 $ 1,747
Securities in An Unrealized Loss Position [Line Items]    
Number of Securities | security 423  
Number of Securities | security   265
Fair Value    
Fair Value - Less Than 12 Months $ 60,863  
Fair Value - Less Than 12 Months   $ 35,500
Fair Value - 12 Months or Longer 109,935  
Fair Value - 12 Months or Longer   81,360
Fair Value - Total 170,798  
Fair Value - Total   116,860
Unrealized Losses    
Unrealized Losses - Less Than 12 Months 558  
Unrealized Losses - Less Than 12 Months   479
Unrealized Losses - 12 Months or Longer 2,316  
Unrealized Losses - 12 Months or Longer   781
Unrealized Losses - Total $ 2,874  
Unrealized Losses - Total   $ 1,260
Corporate debt securities    
Securities in An Unrealized Loss Position [Line Items]    
Number of Securities | security 16  
Fair Value    
Fair Value - Less Than 12 Months $ 82,349  
Fair Value - 12 Months or Longer 0  
Fair Value - Total 82,349  
Unrealized Losses    
Unrealized Losses - Less Than 12 Months 3,725  
Unrealized Losses - 12 Months or Longer 0  
Unrealized Losses - Total $ 3,725  
Equity securities    
Securities in An Unrealized Loss Position [Line Items]    
Number of Securities | security [1]   2
Fair Value    
Fair Value - Less Than 12 Months [1]   $ 391
Fair Value - 12 Months or Longer [1]   6,386
Fair Value - Total [1]   6,777
Unrealized Losses    
Unrealized Losses - Less Than 12 Months [1]   214
Unrealized Losses - 12 Months or Longer [1]   91
Unrealized Losses - Total [1]   $ 305
[1] As a result of accounting guidance adopted in 2018, equity securities are no longer presented within securities available-for-sale and are now presented within equity securities in the Consolidated Statements of Financial Condition for the current period. For further discussion of this guidance, see Note 2, "Recent Accounting Pronouncements."