Securities - Fair Value and Gross Unrealized Losses by Investment Category and Length of Time (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Fair Value, Debt and Equity Securities
Total	$ 156,938	$ 230,888
Less than 12 Months	2,886	27,654
12 Months or More	154,052	203,234
Unrealized Loss, Debt and Equity Securities
Total	1,092	6,427
Less than 12 Months	30	41
12 Months or More	1,062	6,386
Federal agencies and GSEs
Fair Value, Debt and Equity Securities
Total	86,417	103,797
Less than 12 Months	2,038	14,982
12 Months or More	84,379	88,815
Unrealized Loss, Debt and Equity Securities
Total	647	3,473
Less than 12 Months	28	8
12 Months or More	619	3,465
Mortgage-backed and CMOs
Fair Value, Debt and Equity Securities
Total	59,842	86,852
Less than 12 Months	848	5,473
12 Months or More	58,994	81,379
Unrealized Loss, Debt and Equity Securities
Total	398	2,401
Less than 12 Months	2	15
12 Months or More	396	2,386
State and municipal
Fair Value, Debt and Equity Securities
Total	10,679	39,755
Less than 12 Months	0	7,199
12 Months or More	10,679	32,556
Unrealized Loss, Debt and Equity Securities
Total	47	531
Less than 12 Months	0	18
12 Months or More	47	513
Corporate
Fair Value, Debt and Equity Securities
Total	0	484
Less than 12 Months	0	0
12 Months or More	0	484
Unrealized Loss, Debt and Equity Securities
Total	0	22
Less than 12 Months	0	0
12 Months or More	$ 0	$ 22