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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, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Loans with a specific valuation allowance [Abstract]
Specific Allowance		$ 907	$ 1,319	$ 907	$ 1,319	$ 991
Total impaired loans [Abstract]
Recorded balance		46,743	50,729	46,743	50,729	47,412
Unpaid Contractual Principal Balance		51,443	54,443	51,443	54,443	52,212
Specific Allowance		907	1,319	907	1,319	991
Average Investment in Impaired Loans		47,198	51,594	48,001	51,214	49,343
Interest Income Recognized	[1]	585	541	1,126	1,090	2,127
Commercial [Member] | Construction [Member]
Loans without a specific valuation allowance [Abstract]
Recorded Balance		4,299	4,707	4,299	4,707	4,431
Unpaid Contractual Principal Balance		4,299	4,709	4,299	4,709	4,439
Average Investment in Impaired Loans		4,353	5,041	4,261	5,101	4,835
Interest Income Recognized	[1]	69	49	106	86	200
Loans with a specific valuation allowance [Abstract]
Recorded Balance			153		153	153
Unpaid Contractual Principal Balance			174		174	173
Specific Allowance		0	25	0	25	25
Average Investment in Impaired Loans			153		157	155
Interest Income Recognized	[1]		0		0	0
Total impaired loans [Abstract]
Recorded balance		4,299	4,860	4,299	4,860	4,584
Unpaid Contractual Principal Balance		4,299	4,883	4,299	4,883	4,612
Specific Allowance		0	25	0	25	25
Average Investment in Impaired Loans		4,353	5,194	4,261	5,258	4,990
Interest Income Recognized	[1]	69	49	106	86	200
Commercial [Member] | Real Estate [Member]
Loans without a specific valuation allowance [Abstract]
Recorded Balance		29,718	27,509	29,718	27,509	28,480
Unpaid Contractual Principal Balance		31,653	28,195	31,653	28,195	30,365
Average Investment in Impaired Loans		29,982	27,858	30,774	28,252	27,753
Interest Income Recognized	[1]	372	343	724	704	1,344
Loans with a specific valuation allowance [Abstract]
Recorded Balance		2,156	4,731	2,156	4,731	2,985
Unpaid Contractual Principal Balance		3,277	5,833	3,277	5,833	4,095
Specific Allowance		807	1,227	807	1,227	966
Average Investment in Impaired Loans		2,199	4,745	2,166	4,362	3,932
Interest Income Recognized	[1]	1	5	1	5	8
Total impaired loans [Abstract]
Recorded balance		31,874	32,240	31,874	32,240	31,465
Unpaid Contractual Principal Balance		34,930	34,028	34,930	34,028	34,460
Specific Allowance		807	1,227	807	1,227	966
Average Investment in Impaired Loans		32,181	32,603	32,940	32,614	31,685
Interest Income Recognized	[1]	373	348	725	709	1,352
Commercial [Member] | Equipment Lease Financing [Member]
Loans without a specific valuation allowance [Abstract]
Recorded Balance			130		130	0
Unpaid Contractual Principal Balance			130		130	0
Average Investment in Impaired Loans			135		68	34
Interest Income Recognized	[1]		0		0	0
Loans with a specific valuation allowance [Abstract]
Specific Allowance			0		0	0
Total impaired loans [Abstract]
Recorded balance			130		130	0
Unpaid Contractual Principal Balance			130		130	0
Specific Allowance			0		0	0
Average Investment in Impaired Loans			135		68	34
Interest Income Recognized	[1]		0		0	0
Commercial [Member] | Other [Member]
Loans without a specific valuation allowance [Abstract]
Recorded Balance		8,606	10,719	8,606	10,719	9,481
Unpaid Contractual Principal Balance		10,250	12,619	10,250	12,619	11,252
Average Investment in Impaired Loans		8,722	10,882	9,027	10,981	10,444
Interest Income Recognized	[1]	128	133	280	273	539
Loans with a specific valuation allowance [Abstract]
Recorded Balance		343	131	343	131	0
Unpaid Contractual Principal Balance		343	134	343	134	0
Specific Allowance		100	67	100	67	0
Average Investment in Impaired Loans		321	131	161	66	65
Interest Income Recognized	[1]	4	0	4	0	0
Total impaired loans [Abstract]
Recorded balance		8,949	10,850	8,949	10,850	9,481
Unpaid Contractual Principal Balance		10,593	12,753	10,593	12,753	11,252
Specific Allowance		100	67	100	67	0
Average Investment in Impaired Loans		9,043	11,013	9,188	11,047	10,509
Interest Income Recognized	[1]	132	133	284	273	539
Residential [Member] | Construction [Member]
Loans without a specific valuation allowance [Abstract]
Recorded Balance			846		846	318
Unpaid Contractual Principal Balance			846		846	318
Average Investment in Impaired Loans		0	846	159	423	534
Interest Income Recognized	[1]	0	0	0	0	0
Loans with a specific valuation allowance [Abstract]
Specific Allowance			0		0	0
Total impaired loans [Abstract]
Recorded balance			846		846	318
Unpaid Contractual Principal Balance			846		846	318
Specific Allowance			0		0	0
Average Investment in Impaired Loans		0	846	159	423	534
Interest Income Recognized	[1]	0	0	0	0	0
Residential [Member] | Real Estate [Member]
Loans without a specific valuation allowance [Abstract]
Recorded Balance		1,621	1,803	1,621	1,803	1,564
Unpaid Contractual Principal Balance		1,621	1,803	1,621	1,803	1,570
Average Investment in Impaired Loans		1,621	1,803	1,453	1,804	1,591
Interest Income Recognized	[1]	11	11	11	22	36
Loans with a specific valuation allowance [Abstract]
Specific Allowance		0	0	0	0	0
Total impaired loans [Abstract]
Recorded balance		1,621	1,803	1,621	1,803	1,564
Unpaid Contractual Principal Balance		1,621	1,803	1,621	1,803	1,570
Specific Allowance		0	0	0	0	0
Average Investment in Impaired Loans		1,621	1,803	1,453	1,804	1,591
Interest Income Recognized	[1]	$ 11	$ 11	$ 11	$ 22	$ 36
[1] Cash basis interest is substantially the same as interest income recognized.

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