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Securities - Securities In An Unrealized Loss Position (Details)
$ in Thousands
Dec. 31, 2020
USD ($)
security
Dec. 31, 2019
USD ($)
security
Fair Value    
Number of Securities | security 178 286
Fair Value - Less Than 12 Months $ 682,644 $ 375,608
Fair Value - 12 Months or Longer 123,370 608,390
Fair Value - Total 806,014 983,998
Unrealized Losses    
Unrealized Losses - Less Than 12 Months 8,628 4,744
Unrealized Losses - 12 Months or Longer 1,585 4,554
Unrealized Losses - Total $ 10,213 $ 9,298
U.S. treasury securities    
Fair Value    
Number of Securities | security   5
Fair Value - Less Than 12 Months   $ 4,966
Fair Value - 12 Months or Longer   0
Fair Value - Total   4,966
Unrealized Losses    
Unrealized Losses - Less Than 12 Months   1
Unrealized Losses - 12 Months or Longer   0
Unrealized Losses - Total   $ 1
U.S. agency securities    
Fair Value    
Number of Securities | security 48 52
Fair Value - Less Than 12 Months $ 253,841 $ 97,729
Fair Value - 12 Months or Longer 14,932 49,387
Fair Value - Total 268,773 147,116
Unrealized Losses    
Unrealized Losses - Less Than 12 Months 4,764 1,200
Unrealized Losses - 12 Months or Longer 212 636
Unrealized Losses - Total $ 4,976 $ 1,836
CMOs    
Fair Value    
Number of Securities | security 104 148
Fair Value - Less Than 12 Months $ 349,853 $ 187,470
Fair Value - 12 Months or Longer 86,618 412,083
Fair Value - Total 436,471 599,553
Unrealized Losses    
Unrealized Losses - Less Than 12 Months 3,205 2,177
Unrealized Losses - 12 Months or Longer 1,118 2,850
Unrealized Losses - Total $ 4,323 $ 5,027
MBSs    
Fair Value    
Number of Securities | security 19 59
Fair Value - Less Than 12 Months $ 69,838 $ 66,340
Fair Value - 12 Months or Longer 12,307 121,861
Fair Value - Total 82,145 188,201
Unrealized Losses    
Unrealized Losses - Less Than 12 Months 550 996
Unrealized Losses - 12 Months or Longer 90 852
Unrealized Losses - Total $ 640 $ 1,848
Municipal securities    
Fair Value    
Number of Securities | security 4 16
Fair Value - Less Than 12 Months $ 1,012 $ 9,384
Fair Value - 12 Months or Longer 0 3,104
Fair Value - Total 1,012 12,488
Unrealized Losses    
Unrealized Losses - Less Than 12 Months 4 89
Unrealized Losses - 12 Months or Longer 0 10
Unrealized Losses - Total $ 4 $ 99
Corporate debt securities    
Fair Value    
Number of Securities | security 3 6
Fair Value - Less Than 12 Months $ 8,100 $ 9,719
Fair Value - 12 Months or Longer 9,513 21,955
Fair Value - Total 17,613 31,674
Unrealized Losses    
Unrealized Losses - Less Than 12 Months 105 281
Unrealized Losses - 12 Months or Longer 165 206
Unrealized Losses - Total $ 270 $ 487