Loans (Narrative) (Details) $ in Thousands	3 Months Ended			12 Months Ended
	Mar. 31, 2019 USD ($) loan	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan loss	$ 10,846			$ 10,976
Loans and leases receivable, allowance percentage	(0.80%)			(0.81%)
Net deferred costs (fees)	$ 1,261			$ 1,183
Deferred loan fees and premiums include net deferred fees paid by customers	3,100			3,100
Offset by net deferred premiums paid to purchase loans	$ 4,400			$ 4,300
Total number of loans | loan	37			38
Non- accrual delinquent loans	$ 5,738			$ 11,152
Total non-accrual loans	13,815			19,282
Reserve for delinquent non accrual loans	893			978
Increase In Non Accrual Loans		$ 10,100		14,600
Decrease in non accrual loan	3,800
Decrease in loan delinquency	(5,700)
Loans receivable	$ 1,363,176		$ 1,279,655	$ 1,346,922
Percentage status of loan in portfolio	100.00%			100.00%
Charge-offs	$ 742		580
Unpaid contractual principal balance	30,648		36,637	$ 37,208
Total recorded investment	30,579		35,987	36,880
Loans, carrying amount	1,353,591			1,337,129
Non-accrual current loans	8,077			8,130
Past Due	6,472			$ 12,244
PCI Loans, Accretion Interest	$ 172
Number of TDR loans	13,000			13,000
Number of accrual TDR loans	12,000			12,000
Financing receivable post modification recorded investment	$ 6,678			$ 6,705
Accrual TDR loans	$ 6,652			$ 6,676
Twelve Loans And Three Customer Relationships [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total number of loans | loan	12
Total non-accrual loans	$ 10,900
Percentage Status Of Non Accrual Loans	79.00%
Ten Loans Representing Five Customer Relationships [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total number of loans | loan				13
Total non-accrual loans				$ 15,300
Percentage Status Of Non Accrual Loans				79.00%
Financing Receivable Troubled Debt Restructuring [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Increase (Decrease) in Finance Receivables	$ (24)
TDR loan principal curtailment				$ 176
One Troubled Debt Restructuring Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total non-accrual loans	26			29
Specific reserves for TDR loans	$ 164
Number of TDR loans | loan	1
Financing receivable post modification recorded investment	$ 1,500
Seven Troubled Debt Restructuring Loans with Reserves [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Specific reserves for TDR loans				$ 165
Number of TDR loans | loan				1
Financing receivable post modification recorded investment				$ 1,600
Seven Trouble Debt Restructuring Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans removed from troubled debt restructuring | loan				3
Amount of loans removed from troubled debt restructuring				$ 3,900
Nonaccrual Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Increase (Decrease) in Finance Receivables	$ 5,500			$ 19,300
Percentage status of loan in portfolio	1.01%			1.43%
Nonaccrual Loans With No Impairment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non- accrual delinquent loans	$ 8,100
Total non-accrual loans	$ 12,100			$ 17,400
Percentage of current loans on total non accrual loans	58.00%			42.00%
Decrease in non accrual loan	$ 1,800
Interest due to debt	193			$ 456
Nonaccrual Loans With Impairment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non- accrual delinquent loans	5,700			11,200
Total non-accrual loans	$ 1,700			$ 1,900
Percentage of delinquent loans on total non accrual loans	42.00%			58.00%
Interest due to debt	$ 122			$ 81
Unrated [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	332,345			333,349
Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	1,006,554			981,347
Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 24,277			$ 32,226
Residential Rentals Portfolio Segment [Member] | Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Debt maturity period	3 years
Residential Rentals Portfolio Segment [Member] | Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Debt maturity period	20 years
Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total number of loans | loan	14			17
Non- accrual delinquent loans	$ 4,022			$ 8,474
Total non-accrual loans	10,110			14,632
Loans receivable	$ 891,165		817,576	$ 878,016
Percentage status of loan in portfolio	65.37%			65.19%
Charge-offs			236
Unpaid contractual principal balance	$ 22,320		27,398	$ 27,835
Total recorded investment	22,293		26,906	27,540
Non-accrual current loans	6,088			6,158
Past Due	$ 4,387			$ 9,151
Number of TDR loans | loan	7			7
Financing receivable post modification recorded investment	$ 5,590			$ 5,612
Commercial Real Estate Portfolio Segment [Member] | Unrated [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	109,399			112,280
Commercial Real Estate Portfolio Segment [Member] | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	762,790			741,037
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 18,976			$ 24,699
Commercial Real Estate Portfolio Segment [Member] | Commercial Construction Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage status of loan in portfolio	6.00%			5.90%
Residential First Mortgages Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total number of loans | loan	6			5
Non- accrual delinquent loans	$ 149			$ 146
Total non-accrual loans	1,366			1,374
Increase (Decrease) in Finance Receivables	5,900			11,000
Loans receivable	$ 156,653		166,390	$ 156,709
Percentage status of loan in portfolio	11.49%			11.63%
Charge-offs			37
Unpaid contractual principal balance	$ 2,507		2,435	$ 2,527
Total recorded investment	2,505		2,370	2,527
Non-accrual current loans	1,217			1,228
Past Due	$ 150			$ 212
Number of TDR loans | loan	1			1
Financing receivable post modification recorded investment	$ 66			$ 66
Residential First Mortgages Portfolio Segment [Member] | Adjustable Rate Residential First Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 56,800			$ 54,200
Percentage status of loan in portfolio	4.20%			4.00%
Residential First Mortgages Portfolio Segment [Member] | Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Debt maturity period	10 years
Residential First Mortgages Portfolio Segment [Member] | Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Debt maturity period	30 years
Residential Rentals Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total number of loans | loan	6			5
Non- accrual delinquent loans	$ 258			$ 260
Total non-accrual loans	995			963
Loans receivable	$ 124,518		129,026	$ 124,298
Percentage status of loan in portfolio	9.13%			9.23%
Charge-offs	$ 53
Unpaid contractual principal balance	1,773		1,424	$ 1,745
Total recorded investment	1,768		1,401	1,745
Non-accrual current loans	737			703
Past Due	$ 257			$ 313
Number of TDR loans | loan	1			1
Financing receivable post modification recorded investment	$ 215			$ 216
Residential Rentals Portfolio Segment [Member] | 1-4 Family Units [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	95,500			96,600
Residential Rentals Portfolio Segment [Member] | Apartment Buildings Rentals [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	29,000			27,700
Residential Rentals Portfolio Segment [Member] | Adjustable Rate Residential Rentals [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 98,300			$ 97,400
Percentage status of loan in portfolio	7.20%			7.20%
Residential Rentals Portfolio Segment [Member] | Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Debt maturity period	3 years
Residential Rentals Portfolio Segment [Member] | Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Debt maturity period	20 years
Residential Rentals Portfolio Segment [Member] | Unrated [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 37,865			$ 37,478
Residential Rentals Portfolio Segment [Member] | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	85,407			85,551
Residential Rentals Portfolio Segment [Member] | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	1,246			1,269
Construction And Land Development Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 32,798		28,226	$ 29,705
Percentage status of loan in portfolio	2.41%			2.21%
Unpaid contractual principal balance	$ 729		729	$ 729
Total recorded investment	$ 729		729	$ 729
Number of TDR loans | loan	2			2
Financing receivable post modification recorded investment	$ 729			$ 729
Construction And Land Development Portfolio Segment [Member] | Unrated [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	1,616			2,172
Construction And Land Development Portfolio Segment [Member] | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	31,182			26,805
Construction And Land Development Portfolio Segment [Member] | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable				728
Home Equity And Second Mortgages Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 36,746			$ 35,561
Percentage status of loan in portfolio	2.70%			2.64%
Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total number of loans | loan	2			2
Non- accrual delinquent loans	$ 829			$ 866
Total non-accrual loans	829			866
Loans receivable	$ 70,725		52,198	$ 71,680
Percentage status of loan in portfolio	5.19%			5.32%
Unpaid contractual principal balance	$ 2,672		3,008	$ 2,762
Total recorded investment	2,661		2,950	2,751
Past Due	919			$ 866
Number of TDR loans | loan				1
Financing receivable post modification recorded investment				$ 53
Commercial Portfolio Segment [Member] | Unrated [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	19,657			19,157
Commercial Portfolio Segment [Member] | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	48,409			49,828
Commercial Portfolio Segment [Member] | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	2,659			2,695
Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 851		853	$ 751
Percentage status of loan in portfolio	0.06%			0.06%
Charge-offs	$ 4		1
Unpaid contractual principal balance				$ 1
Past Due	$ 1			$ 5
Commercial Equipment Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total number of loans | loan	6			7
Non- accrual delinquent loans	$ 287			$ 1,259
Total non-accrual loans	322			1,300
Loans receivable	$ 49,720		45,905	$ 50,202
Percentage status of loan in portfolio	3.65%			3.73%
Charge-offs	$ 685		299
Unpaid contractual principal balance	390		1,333	$ 1,315
Total recorded investment	373		1,324	1,299
Non-accrual current loans	35			41
Past Due	$ 305			$ 1,284
Number of TDR loans | loan	2			1
Financing receivable post modification recorded investment	$ 78			$ 29
Commercial Equipment Portfolio Segment [Member] | Unrated [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	15,731			15,373
Commercial Equipment Portfolio Segment [Member] | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	33,815			33,685
Commercial Equipment Portfolio Segment [Member] | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	174			1,144
31 - 60 Days [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	771			305
31 - 60 Days [Member] | Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	364
31 - 60 Days [Member] | Residential Rentals Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	12			13
31 - 60 Days [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	90
31 - 60 Days [Member] | Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	1			1
31 - 60 Days [Member] | Commercial Equipment Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	44			25
61 - 89 Days [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due				829
61 - 89 Days [Member] | Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due				677
61 - 89 Days [Member] | Residential First Mortgages Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due				66
61 - 89 Days [Member] | Residential Rentals Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due				53
61 - 89 Days [Member] | Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due				4
61 - 89 Days [Member] | Commercial Equipment Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due				29
90 or Greater Days [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	5,701			11,110
90 or Greater Days [Member] | Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	4,023			8,474
90 or Greater Days [Member] | Residential First Mortgages Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	150			146
90 or Greater Days [Member] | Residential Rentals Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	245			247
90 or Greater Days [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	829			866
90 or Greater Days [Member] | Commercial Equipment Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	$ 261			$ 1,230
Loan Delinquency [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage status of loan in portfolio	0.47%			0.91%
Performing Financing Receivable [Member] | Residential First Mortgages Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 156,504			$ 156,563
Performing Financing Receivable [Member] | Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	851			751
Nonperforming Financing Receivable [Member] | Residential First Mortgages Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	149			146
PCI Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 3,227		3,871	3,220
Percentage status of loan in portfolio	0.19%
Unpaid contractual principal balance	$ 3,900
Total recorded investment	3,200
Loans, carrying amount	3,227			3,220
PCI Loans [Member] | Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	1,750		1,537	1,785
PCI Loans [Member] | Residential First Mortgages Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	468			466
PCI Loans [Member] | Residential Rentals Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	886		1,756	897
PCI Loans [Member] | Construction And Land Development Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable			$ 110
PCI Loans [Member] | Home Equity And Second Mortgages Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	123			72
All Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan loss	10,846			10,976
Net deferred costs (fees)	1,261			1,183
Loans receivable	1,359,949			1,343,702
Loans, carrying amount	1,350,364			1,333,909
All Other Loans [Member] | Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	889,415			876,231
All Other Loans [Member] | Residential First Mortgages Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	156,185			156,243
All Other Loans [Member] | Residential Rentals Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	123,632			123,401
All Other Loans [Member] | Construction And Land Development Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	32,798			29,705
All Other Loans [Member] | Home Equity And Second Mortgages Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	36,623			35,489
All Other Loans [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	70,725			71,680
All Other Loans [Member] | Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	851			751
All Other Loans [Member] | Commercial Equipment Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	49,720			50,202
County First Acquisition [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 101,363			$ 106,887
Percentage status of loan in portfolio	7.44%			7.94%
County First Acquisition [Member] | PCI Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 3,227			$ 3,220
Percentage status of loan in portfolio	0.24%			0.24%
County First Acquisition [Member] | All Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 98,136			$ 103,667
Percentage status of loan in portfolio	7.20%			7.70%
County First Bank Acquisition [Member] | PCI Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
New Acquisition Accounting Far Market Value Adjustment	$ 694
Net Acquisition Accounting Fair Market Value Adjustment, Mark	17.70%
County First Bank Acquisition [Member] | All Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
New Acquisition Accounting Far Market Value Adjustment	$ 1,700
Net Acquisition Accounting Fair Market Value Adjustment, Mark	1.70%