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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)