Securities (Narrative) (Details) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018	Jan. 31, 2018
Debt and Equity Securities, FV-NI [Line Items]
Asset-backed securities pledged to secure certain deposits	$ 44,600,000	$ 41,300,000
Asset-backed securities pledged as collateral	0	3,300,000
Amount	225,869,000	216,247,000
Amortized cost, available for sale	128,771,000	122,524,000
Other-than temporary impairment charges	0	0
Sale of securities	0	0	$ 34,900,000
Securities held to maturity (HTM), at amortized cost	95,657,000	96,271,000
Securities available for sale (AFS), at fair value	130,212,000	119,976,000
Fair value of securities of unrealized losses from amortized cost	32,400,000	84,941,000
Unrealized losses	469,000	2,757,000
Held-to-maturity Securities, Fair Value, Total	96,372,000	93,745,000
Fair value of securities of unrealized losses from amortized cost	38,412,000	83,047,000
Total, unrealized losses	372,000	2,672,000
Gross unrealized losses, available for sale	469,000	2,757,000
Gross unrealized losses, held to maturity	372,000	2,672,000
Residential Mortgage Backed Securities Issued By US Government Sponsored Enterprises [Member]
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost, available for sale	12,000,000	7,641,000
Securities held to maturity (HTM), at amortized cost	28,639,000	25,948,000
Securities available for sale (AFS), at fair value	12,033,000	7,361,000
Held-to-maturity Securities, Fair Value, Total	29,208,000	25,267,000
Gross unrealized losses, available for sale	21,000	281,000
Gross unrealized losses, held to maturity	21,000	756,000
Residential Collateralized Mortgage Obligations, Issued By US Government Sponsored Enterprises [Member]
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost, available for sale	105,150,000	102,411,000
Securities held to maturity (HTM), at amortized cost	50,025,000	52,375,000
Securities available for sale (AFS), at fair value	106,534,000	100,740,000
Held-to-maturity Securities, Fair Value, Total	50,100,000	51,079,000
Gross unrealized losses, available for sale	377,000	1,870,000
Gross unrealized losses, held to maturity	$ 278,000	$ 1,360,000
Asset-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Debt and Equity Securities, FV-NI [Line Items]
Held to maturity securities with unrealized losses, average life	4 years 4 months 27 days	4 years 10 months 17 days
Securities held to maturity (HTM), at amortized cost	$ 38,000,000	$ 82,600,000
Fair value of securities of unrealized losses from amortized cost	32,400,000	84,941,000
Unrealized losses	469,000	2,757,000
Fair value of securities of unrealized losses from amortized cost	32,989,000	77,707,000
Total, unrealized losses	$ 350,000	$ 2,521,000
Asset-backed Securities, Issued by Private Enterprises [Member]
Debt and Equity Securities, FV-NI [Line Items]
Held to maturity securities with unrealized losses, average life	3 years 9 months 15 days	3 years 4 days
Held to maturity securities with unrealized losses, average duration	3 years 2 months 17 days	2 years 3 months 29 days
Fair value of securities of unrealized losses from amortized cost	$ 425,000	$ 441,000
Total, unrealized losses	14,000	41,000
Us Government Agencies Callable Agency Bonds [Member]
Debt and Equity Securities, FV-NI [Line Items]
Securities held to maturity (HTM), at amortized cost	5,005,000	5,009,000
Held-to-maturity Securities, Fair Value, Total	4,997,000	4,899,000
Fair value of securities of unrealized losses from amortized cost	4,998,000	4,899,000
Total, unrealized losses	8,000	110,000
Gross unrealized losses, held to maturity	$ 8,000	$ 110,000
Asset Backed Securities Or Bonds Issued By Us Government Sponsored Enterprises [Member]
Debt and Equity Securities, FV-NI [Line Items]
Held to maturity securities with unrealized losses, average duration	3 years 7 months 16 days	4 years 3 months 4 days
Fair value of securities of unrealized losses from amortized cost	$ 93,500,000	$ 84,300,000
Total, unrealized losses	$ 400,000	$ 2,700,000
Asset-backed securities issued by GSEs [Member]
Debt and Equity Securities, FV-NI [Line Items]
Available for sale securities, average life	3 years 9 months 18 days	4 years 4 months 13 days
Available for sale securities, average duration	3 years 5 months 11 days	3 years 10 months 10 days
Held to maturity securities, average life	4 years 4 months 27 days	4 years 10 months 17 days
Held to maturity securities, average duration	3 years 11 months 4 days	4 years 3 months
Available for sale securities with unrealized losses, average life	3 years 11 months 21 days	4 years 3 months 26 days
Available for sale securities with unrealized losses, average duration	3 years 7 months 16 days	3 years 9 months 29 days
Securities held to maturity (HTM), at amortized cost	$ 435,000	$ 482,000
Residential Collateralized Mortgage Obligations, Issued By Private Enterprises [Member]
Debt and Equity Securities, FV-NI [Line Items]
Securities held to maturity (HTM), at amortized cost	435,000	482,000
Held-to-maturity Securities, Fair Value, Total	425,000	441,000
Gross unrealized losses, held to maturity	14,000	41,000
US Government Obligations [Member]
Debt and Equity Securities, FV-NI [Line Items]
Securities held to maturity (HTM), at amortized cost	1,499,000	999,000
Held-to-maturity Securities, Fair Value, Total	1,499,000	998,000
Gross unrealized losses, held to maturity	$ 0	$ 1,000
Standard Poor's, AAA Rating [Member]
Debt and Equity Securities, FV-NI [Line Items]
Percentage of asset backed securities in investment portfolio	99.00%	99.00%
Amount	$ 225,434,000	$ 215,765,000
Standard Poor's, BB Rating [Member]
Debt and Equity Securities, FV-NI [Line Items]
Amount	$ 435,000	$ 482,000