Debt Securities - Unrealized Loss Position (Details) $ in Thousands	Dec. 31, 2020 USD ($) security	Dec. 31, 2019 USD ($) security
Debt Securities
Number of securities | security	46	88
Available-for-sale, Fair Value
Less than 12 Months	$ 145,530	$ 289,499
12 Months or More	753	46,637
Total	146,283	336,136
Available-for-sale, Unrealized Loss
Less than 12 Months	(783)	(1,608)
12 Months or Longer	(9)	(479)
Total	$ (792)	$ (2,087)
U.S. government and federal agency
Debt Securities
Number of securities | security	18	20
Available-for-sale, Fair Value
Less than 12 Months	$ 13,814	$ 464
12 Months or More	726	9,902
Total	14,540	10,366
Available-for-sale, Unrealized Loss
Less than 12 Months	(258)	0
12 Months or Longer	(9)	(65)
Total	$ (267)	$ (65)
State and local governments
Debt Securities
Number of securities | security	6	12
Available-for-sale, Fair Value
Less than 12 Months	$ 3,121	$ 19,044
12 Months or More	0	0
Total	3,121	19,044
Available-for-sale, Unrealized Loss
Less than 12 Months	(54)	(80)
12 Months or Longer	0	0
Total	$ (54)	$ (80)
Corporate bonds
Debt Securities
Number of securities | security	3	2
Available-for-sale, Fair Value
Less than 12 Months	$ 5,500	$ 7,378
12 Months or More	0	0
Total	5,500	7,378
Available-for-sale, Unrealized Loss
Less than 12 Months	(8)	(1)
12 Months or Longer	0	0
Total	$ (8)	$ (1)
Residential mortgage-backed securities
Debt Securities
Number of securities | security	14	35
Available-for-sale, Fair Value
Less than 12 Months	$ 2,354	$ 85,562
12 Months or More	27	29,038
Total	2,381	114,600
Available-for-sale, Unrealized Loss
Less than 12 Months	(4)	(234)
12 Months or Longer	0	(315)
Total	$ (4)	$ (549)
Commercial mortgage-backed securities
Debt Securities
Number of securities | security	5	19
Available-for-sale, Fair Value
Less than 12 Months	$ 120,741	$ 177,051
12 Months or More	0	7,697
Total	120,741	184,748
Available-for-sale, Unrealized Loss
Less than 12 Months	(459)	(1,293)
12 Months or Longer	0	(99)
Total	$ (459)	$ (1,392)