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Securities - Gross Unrealized Losses and Fair Value (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Less Than 12 Months, Fair Value | $ 390,392 | $ 58,995
Less Than 12 Months, Unrealized Losses | (4,320) | (391)
12 Months or Longer, Fair Value | 72,404 | 147,092
12 Months or Longer, Unrealized Losses | (2,543) | (6,092)
Total, Fair Value | 462,796 | 206,087
Total, Unrealized Losses | (6,863) | (6,483)
Held-to-maturity securities, Less Than 12 Months, Fair Value |  | 17,456
Held-to-maturity securities, Less Than 12 Months, Unrealized Losses |  | (126)
Held-to-maturity securities, 12 Months or Longer, Fair Value |  | 2,999
Held-to-maturity securities, 12 Months or Longer, Unrealized Losses |  | (1)
Held-to-maturity securities, Total, Fair Value |  | 20,455
Held-to-maturity securities, Total, Unrealized Losses |  | (127)
U.S. Government-sponsored agencies |  |
Less Than 12 Months, Fair Value | 2,931 | 0
Less Than 12 Months, Unrealized Losses | (69) | 0
12 Months or Longer, Fair Value | 44,034 | 52,351
12 Months or Longer, Unrealized Losses | (1,090) | (1,652)
Total, Fair Value | 46,965 | 52,351
Total, Unrealized Losses | (1,159) | (1,652)
Municipal securities |  |
Less Than 12 Months, Fair Value | 61,658 | 18,731
Less Than 12 Months, Unrealized Losses | (164) | (114)
12 Months or Longer, Fair Value | 0 | 23,519
12 Months or Longer, Unrealized Losses | 0 | (617)
Total, Fair Value | 61,658 | 42,250
Total, Unrealized Losses | (164) | (731)
Agency mortgage-backed securities |  |
Less Than 12 Months, Fair Value | 320,805 | 38,987
Less Than 12 Months, Unrealized Losses | (4,085) | (276)
12 Months or Longer, Fair Value | 18,818 | 45,297
12 Months or Longer, Unrealized Losses | (1,007) | (2,189)
Total, Fair Value | 339,623 | 84,284
Total, Unrealized Losses | (5,092) | (2,465)
Private label mortgage-backed securities |  |
Less Than 12 Months, Fair Value |  | 1,277
Less Than 12 Months, Unrealized Losses |  | (1)
12 Months or Longer, Fair Value |  | 558
12 Months or Longer, Unrealized Losses |  | (1)
Total, Fair Value |  | 1,835
Total, Unrealized Losses |  | (2)
Asset-backed securities |  |
Less Than 12 Months, Fair Value |  | 0
Less Than 12 Months, Unrealized Losses |  | 0
12 Months or Longer, Fair Value |  | 4,961
12 Months or Longer, Unrealized Losses |  | (39)
Total, Fair Value |  | 4,961
Total, Unrealized Losses |  | (39)
Corporate securities |  |
Less Than 12 Months, Fair Value | 4,998 | 0
Less Than 12 Months, Unrealized Losses | (2) | 0
12 Months or Longer, Fair Value | 9,552 | 20,406
12 Months or Longer, Unrealized Losses | (446) | (1,594)
Total, Fair Value | 14,550 | 20,406
Total, Unrealized Losses | $ (448) | (1,594)
Held-to-maturity securities, Less Than 12 Months, Fair Value |  | 17,456
Held-to-maturity securities, Less Than 12 Months, Unrealized Losses |  | (126)
Held-to-maturity securities, 12 Months or Longer, Fair Value |  | 2,999
Held-to-maturity securities, 12 Months or Longer, Unrealized Losses |  | (1)
Held-to-maturity securities, Total, Fair Value |  | 20,455
Held-to-maturity securities, Total, Unrealized Losses |  | $ (127)

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