Investments (Gross Unrealized Losses and Fair Values of Securities) (Details) - USD ($)	Sep. 30, 2021	Dec. 31, 2020
Schedule of Investments [Line Items]
Available-for-Sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 127,558,000	$ 118,172,000
Available-for-Sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses	$ 2,874,000	$ 459,000
Available-for-Sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Number of Investments	15	14
Available-for-Sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	$ 52,447,000	$ 13,260,000
Available-for-Sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses	$ 3,832,000	$ 5,284,000
Available-for-Sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Investments	12	9
Held-to-Maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 8,500,000	$ 2,973,000
Held-to-Maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses	$ 394,000	$ 38,000
Held-to-Maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Number Of Investments	3	1
U.S. government agencies [Member]
Schedule of Investments [Line Items]
Available-for-Sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		$ 39,611,000
Available-for-Sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses		$ 322,000
Available-for-Sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Number of Investments		7
Available-for-Sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	$ 34,325,000
Available-for-Sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses	$ 2,028,000
Available-for-Sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Investments	6
Residential mortgage-backed agencies [Member]
Schedule of Investments [Line Items]
Available-for-Sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 20,582,000	$ 22,899,000
Available-for-Sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses	$ 603,000	$ 100,000
Available-for-Sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Number of Investments	2	2
Held-to-Maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 8,500,000	$ 2,973,000
Held-to-Maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses	$ 394,000	$ 38,000
Held-to-Maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Number Of Investments	3	1
Commercial mortgage-backed agencies [Member]
Schedule of Investments [Line Items]
Available-for-Sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 41,647,000	$ 16,034,000
Available-for-Sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses	$ 480,000	$ 36,000
Available-for-Sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Number of Investments	5	1
Available-for-Sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	$ 7,725,000
Available-for-Sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses	$ 215,000
Available-for-Sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Investments	1
Collateralized mortgage obligations [Member]
Schedule of Investments [Line Items]
Available-for-Sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 65,329,000	$ 39,628,000
Available-for-Sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses	$ 1,791,000	$ 1,000
Available-for-Sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Number of Investments	8	4
Collateralized debt obligations [Member]
Schedule of Investments [Line Items]
Available-for-Sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	$ 10,397,000	$ 13,260,000
Available-for-Sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses	$ 1,589,000	$ 5,284,000
Available-for-Sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Investments	5	9