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Securities - Securities In An Unrealized Loss Position (Details)
$ in Thousands
Sep. 30, 2020
USD ($)
security
Dec. 31, 2019
USD ($)
security
Securities available-for-sale    
Number of Securities | security 131 286
Available-for-Sale, Fair Value    
Less Than 12 Months $ 495,541 $ 375,608
12 Months or Longer 72,653 608,390
Total 568,194 983,998
Unrealized Losses    
Less Than 12 Months 5,555 4,744
12 Months or Longer 1,322 4,554
Total $ 6,877 $ 9,298
U.S. treasury securities    
Securities available-for-sale    
Number of Securities | security   5
Available-for-Sale, Fair Value    
Less Than 12 Months   $ 4,966
12 Months or Longer   0
Total   4,966
Unrealized Losses    
Less Than 12 Months   1
12 Months or Longer   0
Total   $ 1
U.S. agency securities    
Securities available-for-sale    
Number of Securities | security 44 52
Available-for-Sale, Fair Value    
Less Than 12 Months $ 235,984 $ 97,729
12 Months or Longer 14,772 49,387
Total 250,756 147,116
Unrealized Losses    
Less Than 12 Months 3,816 1,200
12 Months or Longer 231 636
Total $ 4,047 $ 1,836
CMOs    
Securities available-for-sale    
Number of Securities | security 52 148
Available-for-Sale, Fair Value    
Less Than 12 Months $ 155,637 $ 187,470
12 Months or Longer 42,137 412,083
Total 197,774 599,553
Unrealized Losses    
Less Than 12 Months 1,111 2,177
12 Months or Longer 554 2,850
Total $ 1,665 $ 5,027
MBSs    
Securities available-for-sale    
Number of Securities | security 19 59
Available-for-Sale, Fair Value    
Less Than 12 Months $ 92,959 $ 66,340
12 Months or Longer 3,395 121,861
Total 96,354 188,201
Unrealized Losses    
Less Than 12 Months 581 996
12 Months or Longer 11 852
Total $ 592 $ 1,848
Municipal securities    
Securities available-for-sale    
Number of Securities | security 13 16
Available-for-Sale, Fair Value    
Less Than 12 Months $ 5,965 $ 9,384
12 Months or Longer 0 3,104
Total 5,965 12,488
Unrealized Losses    
Less Than 12 Months 43 89
12 Months or Longer 0 10
Total $ 43 $ 99
Corporate debt securities    
Securities available-for-sale    
Number of Securities | security 3 6
Available-for-Sale, Fair Value    
Less Than 12 Months $ 4,996 $ 9,719
12 Months or Longer 12,349 21,955
Total 17,345 31,674
Unrealized Losses    
Less Than 12 Months 4 281
12 Months or Longer 526 206
Total $ 530 $ 487