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Investments (Gross Unrealized Losses and Fair Values of Securities) (Details) $ in Thousands	Sep. 30, 2020 USD ($) item	Dec. 31, 2019 USD ($) item
Schedule of Investments [Line Items]
Available-for-Sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 41,041	$ 34,430
Available-for-Sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses	$ 137	$ 134
Available-for-Sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Number of Investments | item	8	6
Available-for-Sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	$ 12,760	$ 70,606
Available-for-Sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses	$ 5,765	$ 4,266
Available-for-Sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Investments | item	9	16
Held-to-Maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		$ 2,722
Held-to-Maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses		$ 6
Held-to-Maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Number Of Investments | item		3
Held-to-Maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		$ 9,486
Held-to-Maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses		$ 149
Held-to-Maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Number Of Investments | item		12
US government agencies [Member]
Schedule of Investments [Line Items]
Available-for-Sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 16,420	$ 24,907
Available-for-Sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses	$ 30	$ 80
Available-for-Sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Number of Investments | item	4	3
Available-for-Sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		$ 14,987
Available-for-Sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses		$ 13
Available-for-Sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Investments | item		3
Residential mortgage-backed agencies [Member]
Schedule of Investments [Line Items]
Available-for-Sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 8,512	$ 4,900
Available-for-Sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses	$ 93	$ 17
Available-for-Sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Number of Investments | item	3	1
Held-to-Maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		$ 2,722
Held-to-Maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses		$ 6
Held-to-Maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Number Of Investments | item		3
Held-to-Maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		$ 9,486
Held-to-Maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses		$ 149
Held-to-Maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Number Of Investments | item		12
Commercial mortgage-backed agencies [Member]
Schedule of Investments [Line Items]
Available-for-Sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 16,109	$ 4,623
Available-for-Sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses	$ 14	$ 37
Available-for-Sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Number of Investments | item	1	2
Available-for-Sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		$ 5,793
Available-for-Sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses		$ 55
Available-for-Sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Investments | item		3
Collateralized mortgage obligations [Member]
Schedule of Investments [Line Items]
Available-for-Sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		$ 35,472
Available-for-Sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses		$ 109
Available-for-Sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Investments | item		1
Collateralized debt obligations [Member]
Schedule of Investments [Line Items]
Available-for-Sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	$ 12,760	$ 14,354
Available-for-Sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses	$ 5,765	$ 4,089
Available-for-Sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Investments | item	9	9

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