Loans, Allowance for Credit Losses and Impaired Loans - Loan Impairment and Allowance for Credit Losses (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year	$ 7,063
Provision for credit losses	1,441	$ 1,175
Balance at end of year	7,304	7,063
Individually evaluated for impairment: Balance in allowance	572	1,042
Individually evaluated for impairment: Related loan balance	18,324	25,454
Collectively evaluated for impairment: Balance in allowance	6,732	6,021
Collectively evaluated for impairment: Related loan balance	975,664	607,122
Unamortized discounts on acquired loans	6,136	1,327
Non-accrual loans
Interest that would have accrued on loans placed on nonaccrual status	255	329
Loans past due 90 days or more still accruing interest	5	606
Real Estate Mortgage \| Construction and Land Development
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year	647
Balance at end of year	602	647
Individually evaluated for impairment: Related loan balance	723	8,708
Collectively evaluated for impairment: Balance in allowance	602	647
Collectively evaluated for impairment: Related loan balance	84,027	64,943
Non-accrual loans
Loans past due 90 days or more still accruing interest		338
Real Estate Mortgage \| Residential Real Estate
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year	1,521
Balance at end of year	1,380	1,521
Individually evaluated for impairment: Balance in allowance	216	580
Individually evaluated for impairment: Related loan balance	3,905	8,082
Collectively evaluated for impairment: Balance in allowance	1,164	941
Collectively evaluated for impairment: Related loan balance	205,381	117,104
Real Estate Mortgage \| Nonresidential
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year	3,629
Balance at end of year	4,074	3,629
Individually evaluated for impairment: Balance in allowance	82	278
Individually evaluated for impairment: Related loan balance	11,449	6,239
Collectively evaluated for impairment: Balance in allowance	3,992	3,351
Collectively evaluated for impairment: Related loan balance	533,101	345,583
Real Estate Mortgage \| Home Equity Loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year	122
Balance at end of year	142	122
Individually evaluated for impairment: Balance in allowance		6
Individually evaluated for impairment: Related loan balance	9	693
Collectively evaluated for impairment: Balance in allowance	142	116
Collectively evaluated for impairment: Related loan balance	37,706	20,088
Commercial
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year	641
Balance at end of year	826	641
Individually evaluated for impairment: Balance in allowance	274	178
Individually evaluated for impairment: Related loan balance	2,238	1,732
Collectively evaluated for impairment: Balance in allowance	552	463
Collectively evaluated for impairment: Related loan balance	109,759	56,490
Non-accrual loans
Loans past due 90 days or more still accruing interest		268
Consumer and Other
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year	13
Balance at end of year	14	13
Collectively evaluated for impairment: Balance in allowance	14	13
Collectively evaluated for impairment: Related loan balance	5,690	2,914
Non-accrual loans
Loans past due 90 days or more still accruing interest	5
Unallocated
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year	490
Balance at end of year	266	490
Collectively evaluated for impairment: Balance in allowance	266	490
Originated Loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year	7,031	6,703
Charge-offs	(1,584)	(1,153)
Recoveries	384	338
Provision for credit losses	1,441	1,175
Allowance allocation adjustment	(47)	(32)
Balance at end of year	7,225	7,031
Originated Loans \| Real Estate Mortgage \| Construction and Land Development
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year	647	589
Charge-offs	(11)	(58)
Recoveries	11	9
Provision for credit losses	(45)	107
Allowance allocation adjustment	(5)
Balance at end of year	597	647
Originated Loans \| Real Estate Mortgage \| Residential Real Estate
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year	1,521	1,583
Charge-offs	(193)	(332)
Recoveries	182	109
Provision for credit losses	(130)	161
Allowance allocation adjustment	(17)
Balance at end of year	1,363	1,521
Originated Loans \| Real Estate Mortgage \| Nonresidential
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year	3,620	3,269
Charge-offs	(460)	(453)
Recoveries	92	80
Provision for credit losses	813	733
Allowance allocation adjustment	(6)	(9)
Balance at end of year	4,059	3,620
Originated Loans \| Real Estate Mortgage \| Home Equity Loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year	115	161
Charge-offs	(105)	(20)
Recoveries		41
Provision for credit losses	125	(60)
Allowance allocation adjustment	7	(7)
Balance at end of year	142	115
Originated Loans \| Commercial
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year	625	520
Charge-offs	(689)	(129)
Recoveries	51	48
Provision for credit losses	823	202
Allowance allocation adjustment	(26)	(16)
Balance at end of year	784	625
Originated Loans \| Consumer and Other
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year	13	16
Charge-offs	(126)	(161)
Recoveries	48	51
Provision for credit losses	79	107
Balance at end of year	14	13
Originated Loans \| Unallocated
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year	490	565
Provision for credit losses	(224)	(75)
Balance at end of year	266	490
Acquired Loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year	32
Allowance allocation adjustment	47	32
Balance at end of year	79	32
Acquired Loans \| Real Estate Mortgage \| Construction and Land Development
Allowance for Loan and Lease Losses [Roll Forward]
Allowance allocation adjustment	5
Balance at end of year	5
Acquired Loans \| Real Estate Mortgage \| Residential Real Estate
Allowance for Loan and Lease Losses [Roll Forward]
Allowance allocation adjustment	17
Balance at end of year	17
Acquired Loans \| Real Estate Mortgage \| Nonresidential
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year	9
Allowance allocation adjustment	6	9
Balance at end of year	15	9
Acquired Loans \| Real Estate Mortgage \| Home Equity Loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year	7
Allowance allocation adjustment	(7)	7
Balance at end of year		7
Acquired Loans \| Commercial
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year	16
Allowance allocation adjustment	26	16
Balance at end of year	$ 42	$ 16

Amount of interest that would have accrued under terms of the loan on financing receivable on nonaccrual status.

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Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts.

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Amount of other addition (reduction) in allowance reserve for credit loss.

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Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

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The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

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The balance of financing receivables that were collectively evaluated for impairment.

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Amount of financing receivable 90 days or more past due and still accruing.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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Amount of expense related to estimated loss from loan and lease transactions.

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Amount of deferred fees paid by borrowers and unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of loans that are being amortized into income as an adjustment to yield. Excludes amounts for loans and leases covered under loss sharing agreements.

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