Securities - Schedule of Held-to-maturity Securities with Unrealized Losses (Details) - USD ($)	Sep. 30, 2021	Dec. 31, 2020
Held-to-maturity debt securities
Fair Value, Less than 12 Months	$ 115,263,000
Unrealized Losses, Less than 12 Months	2,099,000
Fair Value, 12 Months or Longer	0
Unrealized Losses, 12 Months or Longer	0
Fair Value	115,263,000
Unrealized Losses	2,099,000	$ 0
U.S. Treasuries
Held-to-maturity debt securities
Fair Value, Less than 12 Months	35,277,000
Unrealized Losses, Less than 12 Months	630,000
Fair Value, 12 Months or Longer	0
Unrealized Losses, 12 Months or Longer	0
Fair Value	35,277,000
Unrealized Losses	630,000
Obligations of U.S. Government sponsored entities
Held-to-maturity debt securities
Fair Value, Less than 12 Months	79,986,000
Unrealized Losses, Less than 12 Months	1,469,000
Fair Value, 12 Months or Longer	0
Unrealized Losses, 12 Months or Longer	0
Fair Value	79,986,000
Unrealized Losses	$ 1,469,000

Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity), in continuous loss position for 12 months or longer.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
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Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity), in unrealized loss position.

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Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity), in continuous loss position for less than 12 months.

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-Publisher FASB
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-SubTopic 10
-Section 50
-Paragraph 6
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