Securities - Fair Value and Gross Unrealized Losses by Investment Category and Length of Time (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Fair Value, Debt and Equity Securities
Total	$ 198,173	$ 230,888
Less than 12 Months	2,494	27,654
12 Months or More	195,679	203,234
Unrealized Loss, Debt and Equity Securities
Total	3,470	6,427
Less than 12 Months	3	41
12 Months or More	3,467	6,386
Federal agencies and GSEs
Fair Value, Debt and Equity Securities
Total	90,268	103,797
Less than 12 Months	0	14,982
12 Months or More	90,268	88,815
Unrealized Loss, Debt and Equity Securities
Total	2,020	3,473
Less than 12 Months	0	8
12 Months or More	2,020	3,465
Mortgage-backed and CMOs
Fair Value, Debt and Equity Securities
Total	78,494	86,852
Less than 12 Months	244	5,473
12 Months or More	78,250	81,379
Unrealized Loss, Debt and Equity Securities
Total	1,247	2,401
Less than 12 Months	1	15
12 Months or More	1,246	2,386
State and municipal
Fair Value, Debt and Equity Securities
Total	28,916	39,755
Less than 12 Months	2,250	7,199
12 Months or More	26,666	32,556
Unrealized Loss, Debt and Equity Securities
Total	199	531
Less than 12 Months	2	18
12 Months or More	197	513
Corporate
Fair Value, Debt and Equity Securities
Total	495	484
Less than 12 Months	0	0
12 Months or More	495	484
Unrealized Loss, Debt and Equity Securities
Total	4	22
Less than 12 Months	0	0
12 Months or More	$ 4	$ 22