Securities - Fair Value and Gross Unrealized Losses by Investment Category and Length of Time (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Total	$ 96,337	$ 230,888
Less than 12 Months	12,785	27,654
12 Months or More	83,552	203,234
Unrealized Loss, Debt and Equity Securities
Total	498	6,427
Less than 12 Months	61	41
12 Months or More	437	6,386
Federal agencies and GSEs
Debt Securities, Available-for-sale [Line Items]
Total	59,141	103,797
Less than 12 Months	1,889	14,982
12 Months or More	57,252	88,815
Unrealized Loss, Debt and Equity Securities
Total	263	3,473
Less than 12 Months	30	8
12 Months or More	233	3,465
Mortgage-backed and CMOs
Debt Securities, Available-for-sale [Line Items]
Total	32,617	86,852
Less than 12 Months	7,468	5,473
12 Months or More	25,149	81,379
Unrealized Loss, Debt and Equity Securities
Total	207	2,401
Less than 12 Months	12	15
12 Months or More	195	2,386
State and municipal
Debt Securities, Available-for-sale [Line Items]
Total	4,579	39,755
Less than 12 Months	3,428	7,199
12 Months or More	1,151	32,556
Unrealized Loss, Debt and Equity Securities
Total	28	531
Less than 12 Months	19	18
12 Months or More	$ 9	513
Corporate
Debt Securities, Available-for-sale [Line Items]
Total		484
Less than 12 Months		0
12 Months or More		484
Unrealized Loss, Debt and Equity Securities
Total		22
Less than 12 Months		0
12 Months or More		$ 22