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Loans, Impaired Loans, Average Investments in Impaired Loans, and Interest Income Recognized on Impaired Loans (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended		12 Months Ended
		Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Loans with a specific valuation allowance [Abstract]
Specific Allowance		$ 875	$ 907	$ 875	$ 907	$ 801
Total impaired loans [Abstract]
Recorded balance		54,593	46,743	54,593	46,743	46,366
Unpaid Contractual Principal Balance		60,105	51,443	60,105	51,443	50,956
Specific Allowance		875	907	875	907	801
Average Investment in Impaired Loans		55,813	47,198	53,468	48,001	47,097
Interest Income Recognized	[1]	637	585	1,218	1,126	2,171
Commercial [Member] | Construction [Member]
Loans without a specific valuation allowance [Abstract]
Recorded Balance		3,313	4,299	3,313	4,299	4,100
Unpaid Contractual Principal Balance		3,383	4,299	3,383	4,299	4,100
Average Investment in Impaired Loans		3,419	4,353	3,537	4,261	3,923
Interest Income Recognized	[1]	49	69	95	106	171
Loans with a specific valuation allowance [Abstract]
Recorded Balance		174		174		127
Unpaid Contractual Principal Balance		174		174		127
Specific Allowance		99	0	99	0	50
Average Investment in Impaired Loans		189		257		42
Interest Income Recognized	[1]	3		6		0
Total impaired loans [Abstract]
Recorded balance		3,487	4,299	3,487	4,299	4,227
Unpaid Contractual Principal Balance		3,557	4,299	3,557	4,299	4,227
Specific Allowance		99	0	99	0	50
Average Investment in Impaired Loans		3,608	4,353	3,794	4,261	3,965
Interest Income Recognized	[1]	52	69	101	106	171
Commercial [Member] | Real Estate [Member]
Loans without a specific valuation allowance [Abstract]
Recorded Balance		35,043	29,718	35,043	29,718	29,645
Unpaid Contractual Principal Balance		36,740	31,653	36,740	31,653	31,409
Average Investment in Impaired Loans		35,259	29,982	34,035	30,774	30,250
Interest Income Recognized	[1]	403	372	750	724	1,412
Loans with a specific valuation allowance [Abstract]
Recorded Balance		1,985	2,156	1,985	2,156	1,854
Unpaid Contractual Principal Balance		3,473	3,277	3,473	3,277	2,983
Specific Allowance		594	807	594	807	605
Average Investment in Impaired Loans		2,314	2,199	2,140	2,166	2,051
Interest Income Recognized	[1]	5	1	15	1	1
Total impaired loans [Abstract]
Recorded balance		37,028	31,874	37,028	31,874	31,499
Unpaid Contractual Principal Balance		40,213	34,930	40,213	34,930	34,392
Specific Allowance		594	807	594	807	605
Average Investment in Impaired Loans		37,573	32,181	36,175	32,940	32,301
Interest Income Recognized	[1]	408	373	765	725	1,413
Commercial [Member] | Other [Member]
Loans without a specific valuation allowance [Abstract]
Recorded Balance		10,992	8,606	10,992	8,606	8,285
Unpaid Contractual Principal Balance		13,249	10,250	13,249	10,250	9,982
Average Investment in Impaired Loans		11,546	8,722	10,206	9,027	8,774
Interest Income Recognized	[1]	149	128	288	280	530
Loans with a specific valuation allowance [Abstract]
Recorded Balance		516	343	516	343	473
Unpaid Contractual Principal Balance		516	343	516	343	473
Specific Allowance		182	100	182	100	146
Average Investment in Impaired Loans		514	321	842	161	285
Interest Income Recognized	[1]	6	4	23	4	16
Total impaired loans [Abstract]
Recorded balance		11,508	8,949	11,508	8,949	8,758
Unpaid Contractual Principal Balance		13,765	10,593	13,765	10,593	10,455
Specific Allowance		182	100	182	100	146
Average Investment in Impaired Loans		12,060	9,043	11,048	9,188	9,059
Interest Income Recognized	[1]	155	132	311	284	546
Residential [Member] | Construction [Member]
Loans without a specific valuation allowance [Abstract]
Recorded Balance						0
Unpaid Contractual Principal Balance						0
Average Investment in Impaired Loans			0		159	106
Interest Income Recognized	[1]		0		0	0
Loans with a specific valuation allowance [Abstract]
Specific Allowance						0
Total impaired loans [Abstract]
Recorded balance						0
Unpaid Contractual Principal Balance						0
Specific Allowance						0
Average Investment in Impaired Loans			0		159	106
Interest Income Recognized	[1]		0		0	0
Residential [Member] | Real Estate [Member]
Loans without a specific valuation allowance [Abstract]
Recorded Balance		2,570	1,621	2,570	1,621	1,882
Unpaid Contractual Principal Balance		2,570	1,621	2,570	1,621	1,882
Average Investment in Impaired Loans		2,572	1,621	2,451	1,453	1,666
Interest Income Recognized	[1]	22	11	41	11	41
Loans with a specific valuation allowance [Abstract]
Specific Allowance		0	0	0	0	0
Total impaired loans [Abstract]
Recorded balance		2,570	1,621	2,570	1,621	1,882
Unpaid Contractual Principal Balance		2,570	1,621	2,570	1,621	1,882
Specific Allowance		0	0	0	0	0
Average Investment in Impaired Loans		2,572	1,621	2,451	1,453	1,666
Interest Income Recognized	[1]	$ 22	$ 11	$ 41	$ 11	$ 41
[1] Cash basis interest is substantially the same as interest income recognized.

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