Loans (Loan Receivable and Allowance Balances Disaggregated) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
Loans and Leases Receivable [Abstract]
Loans receivable	$ 1,622,129		$ 1,454,172
Allowance for loan losses:
Ending balance: individually evaluated for impairment	104		828	$ 1,181
Ending balance: collectively evaluated for impairment	16,215		10,114	9,737
Total Allowance for loan losses	16,319	$ 15,061	10,942	10,918	$ 10,846	$ 10,976
Portfolio Loans
Loans and Leases Receivable [Abstract]
Ending balance: individually evaluated for impairment	26,500		27,986	27,458
Ending balance: collectively evaluated for impairment	1,464,252		1,423,762	1,356,956
Loans receivable	1,492,745		1,454,172	1,387,186
Purchased credit impaired | Portfolio Loans
Loans and Leases Receivable [Abstract]
Loans receivable	1,993		2,424	2,772
Commercial real estate
Loans and Leases Receivable [Abstract]
Loans receivable	996,111		964,777
Allowance for loan losses:
Ending balance: individually evaluated for impairment	60		417	289
Ending balance: collectively evaluated for impairment	11,208		6,981	6,720
Total Allowance for loan losses	11,268	9,083	7,398	7,009	6,742	6,882
Commercial real estate | Portfolio Loans
Loans and Leases Receivable [Abstract]
Ending balance: individually evaluated for impairment	21,157		20,707	20,918
Ending balance: collectively evaluated for impairment	973,361		942,332	895,305
Loans receivable	996,111		964,777	917,948
Commercial real estate | Purchased credit impaired | Portfolio Loans
Loans and Leases Receivable [Abstract]
Loans receivable	1,593		1,738	1,725
Residential first mortgages
Loans and Leases Receivable [Abstract]
Loans receivable	165,670		167,710
Allowance for loan losses:
Ending balance: individually evaluated for impairment				0
Ending balance: collectively evaluated for impairment	885		464	709
Total Allowance for loan losses	885	862	464	709	722	755
Residential first mortgages | Portfolio Loans
Loans and Leases Receivable [Abstract]
Ending balance: individually evaluated for impairment	1,710		1,917	2,123
Ending balance: collectively evaluated for impairment	163,960		165,793	154,096
Loans receivable	165,670		167,710	156,670
Residential first mortgages | Purchased credit impaired | Portfolio Loans
Loans and Leases Receivable [Abstract]
Loans receivable	0		0	451
Residential rentals
Loans and Leases Receivable [Abstract]
Loans receivable	132,590		123,601
Allowance for loan losses:
Ending balance: collectively evaluated for impairment	1,059		397	458
Total Allowance for loan losses	1,059	702	397	458	462	498
Residential rentals | Portfolio Loans
Loans and Leases Receivable [Abstract]
Ending balance: individually evaluated for impairment	643		937	971
Ending balance: collectively evaluated for impairment	131,947		122,369	120,692
Loans receivable	132,590		123,601	121,990
Residential rentals | Purchased credit impaired | Portfolio Loans
Loans and Leases Receivable [Abstract]
Loans receivable	0		295	327
Construction and land development
Loans and Leases Receivable [Abstract]
Loans receivable	37,580		34,133
Allowance for loan losses:
Ending balance: collectively evaluated for impairment	428		273	246
Total Allowance for loan losses	428	436	273	246	148	310
Construction and land development | Portfolio Loans
Loans and Leases Receivable [Abstract]
Ending balance: individually evaluated for impairment	0		0	0
Ending balance: collectively evaluated for impairment	37,580		34,133	35,662
Loans receivable	37,580		34,133	35,662
Construction and land development | Purchased credit impaired | Portfolio Loans
Loans and Leases Receivable [Abstract]
Loans receivable	0		0	0
Home equity and second mortgages
Loans and Leases Receivable [Abstract]
Loans receivable	33,873		36,098
Allowance for loan losses:
Ending balance: collectively evaluated for impairment	259		149	131
Total Allowance for loan losses	259	258	149	131	132	133
Home equity and second mortgages | Portfolio Loans
Loans and Leases Receivable [Abstract]
Ending balance: individually evaluated for impairment	645		510	471
Ending balance: collectively evaluated for impairment	32,828		35,197	35,126
Loans receivable	33,873		36,098	35,866
Home equity and second mortgages | Purchased credit impaired | Portfolio Loans
Loans and Leases Receivable [Abstract]
Loans receivable	400		391	269
Commercial loans
Loans and Leases Receivable [Abstract]
Loans receivable	63,249		63,102
Allowance for loan losses:
Ending balance: individually evaluated for impairment	0		210	700
Ending balance: collectively evaluated for impairment	1,162		876	702
Total Allowance for loan losses	1,162	2,266	1,086	1,402	1,406	1,482
Commercial loans | Portfolio Loans
Loans and Leases Receivable [Abstract]
Ending balance: individually evaluated for impairment	1,807		3,127	2,626
Ending balance: collectively evaluated for impairment	61,442		59,975	64,991
Loans receivable	63,249		63,102	67,617
Consumer loans
Loans and Leases Receivable [Abstract]
Loans receivable	1,117		1,104
Allowance for loan losses:
Ending balance: individually evaluated for impairment	0		0	0
Ending balance: collectively evaluated for impairment	15		10	9
Total Allowance for loan losses	15	15	10	9	8	6
Consumer loans | Portfolio Loans
Loans and Leases Receivable [Abstract]
Ending balance: individually evaluated for impairment	5		0	0
Ending balance: collectively evaluated for impairment	1,112		1,104	967
Loans receivable	1,117		1,104	967
Commercial equipment
Loans and Leases Receivable [Abstract]
Loans receivable	62,555		63,647
Allowance for loan losses:
Ending balance: individually evaluated for impairment	44		201	192
Ending balance: collectively evaluated for impairment	1,199		964	762
Total Allowance for loan losses	1,243	$ 1,439	1,165	954	$ 1,226	$ 910
Commercial equipment | Portfolio Loans
Loans and Leases Receivable [Abstract]
Ending balance: individually evaluated for impairment	533		788	349
Ending balance: collectively evaluated for impairment	62,022		62,859	50,117
Loans receivable	$ 62,555		$ 63,647	$ 50,466