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Loans, Impaired Loans, Average Investments in Impaired Loans, and Interest Income Recognized on Impaired Loans (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Loans with a specific valuation allowance [Abstract]
Specific Allowance		$ 1,212	$ 801	$ 991
Total impaired loans [Abstract]
Recorded Balance		57,771	46,366	47,412
Unpaid Contractual Principal Balance		61,786	50,956	52,212
Specific Allowance		1,212	801	991
Average Investment in Impaired Loans		55,700	47,097	49,343
Interest Income Recognized	[1]	2,371	2,171	2,127
Commercial [Member] | Construction [Member]
Loans without a specific valuation allowance [Abstract]
Recorded Balance		2,836	4,100	4,431
Unpaid Contractual Principal Balance		2,837	4,100	4,439
Average Investment in Impaired Loans		3,234	3,923	4,835
Interest Income Recognized	[1]	170	171	200
Loans with a specific valuation allowance [Abstract]
Recorded Balance		174	127	153
Unpaid Contractual Principal Balance		174	127	173
Specific Allowance		99	50	25
Average Investment in Impaired Loans		215	42	155
Interest Income Recognized	[1]	11	0	0
Total impaired loans [Abstract]
Recorded Balance		3,010	4,227	4,584
Unpaid Contractual Principal Balance		3,011	4,227	4,612
Specific Allowance		99	50	25
Average Investment in Impaired Loans		3,449	3,965	4,990
Interest Income Recognized	[1]	181	171	200
Commercial [Member] | Real Estate [Member]
Loans without a specific valuation allowance [Abstract]
Recorded Balance		40,346	29,645	28,480
Unpaid Contractual Principal Balance		41,557	31,409	30,365
Average Investment in Impaired Loans		36,976	30,250	27,753
Interest Income Recognized	[1]	1,601	1,412	1,344
Loans with a specific valuation allowance [Abstract]
Recorded Balance		1,033	1,854	2,985
Unpaid Contractual Principal Balance		2,176	2,983	4,095
Specific Allowance		227	605	966
Average Investment in Impaired Loans		1,678	2,051	3,932
Interest Income Recognized	[1]	15	1	8
Total impaired loans [Abstract]
Recorded Balance		41,379	31,499	31,465
Unpaid Contractual Principal Balance		43,733	34,392	34,460
Specific Allowance		227	605	966
Average Investment in Impaired Loans		38,654	32,301	31,685
Interest Income Recognized	[1]	1,616	1,413	1,352
Commercial [Member] | Equipment Lease Financing [Member]
Loans without a specific valuation allowance [Abstract]
Recorded Balance				0
Unpaid Contractual Principal Balance				0
Average Investment in Impaired Loans				34
Interest Income Recognized	[1]			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				34
Interest Income Recognized	[1]			0
Commercial [Member] | Other [Member]
Loans without a specific valuation allowance [Abstract]
Recorded Balance		7,829	8,285	9,481
Unpaid Contractual Principal Balance		9,489	9,982	11,252
Average Investment in Impaired Loans		9,889	8,774	10,444
Interest Income Recognized	[1]	460	530	539
Loans with a specific valuation allowance [Abstract]
Recorded Balance		3,244	473	0
Unpaid Contractual Principal Balance		3,244	473	0
Specific Allowance		886	146	0
Average Investment in Impaired Loans		1,323	285	65
Interest Income Recognized	[1]	29	16	0
Total impaired loans [Abstract]
Recorded Balance		11,073	8,758	9,481
Unpaid Contractual Principal Balance		12,733	10,455	11,252
Specific Allowance		886	146	0
Average Investment in Impaired Loans		11,212	9,059	10,509
Interest Income Recognized	[1]	489	546	539
Residential [Member] | Construction [Member]
Loans without a specific valuation allowance [Abstract]
Recorded Balance			0	318
Unpaid Contractual Principal Balance			0	318
Average Investment in Impaired Loans			106	534
Interest Income Recognized	[1]		0	0
Loans with a specific valuation allowance [Abstract]
Specific Allowance			0	0
Total impaired loans [Abstract]
Recorded Balance			0	318
Unpaid Contractual Principal Balance			0	318
Specific Allowance			0	0
Average Investment in Impaired Loans			106	534
Interest Income Recognized	[1]		0	0
Residential [Member] | Real Estate [Member]
Loans without a specific valuation allowance [Abstract]
Recorded Balance		2,309	1,882	1,564
Unpaid Contractual Principal Balance		2,309	1,882	1,570
Average Investment in Impaired Loans		2,385	1,666	1,591
Interest Income Recognized	[1]	85	41	36
Loans with a specific valuation allowance [Abstract]
Specific Allowance		0	0	0
Total impaired loans [Abstract]
Recorded Balance		2,309	1,882	1,564
Unpaid Contractual Principal Balance		2,309	1,882	1,570
Specific Allowance		0	0	0
Average Investment in Impaired Loans		2,385	1,666	1,591
Interest Income Recognized	[1]	$ 85	$ 41	$ 36
[1] Cash basis interest is substantially the same as interest income recognized.

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