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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, 2018	Dec. 31, 2017	Dec. 31, 2016
Loans with a specific valuation allowance [Abstract]
Specific Allowance		$ 801	$ 991	$ 1,313
Total impaired loans [Abstract]
Recorded Balance		46,366	47,412	52,202
Unpaid Contractual Principal Balance		50,956	52,212	55,888
Specific Allowance		801	991	1,313
Average Investment in Impaired Loans		47,097	49,343	55,679
Interest Income Recognized	[1]	2,171	2,127	2,530
Commercial [Member] | Construction [Member]
Loans without a specific valuation allowance [Abstract]
Recorded Balance		4,100	4,431	4,102
Unpaid Contractual Principal Balance		4,100	4,439	4,123
Average Investment in Impaired Loans		3,923	4,835	4,367
Interest Income Recognized	[1]	171	200	218
Loans with a specific valuation allowance [Abstract]
Recorded Balance		127	153	1,507
Unpaid Contractual Principal Balance		127	173	1,509
Specific Allowance		50	25	213
Average Investment in Impaired Loans		42	155	2,290
Interest Income Recognized	[1]	0	0	0
Total impaired loans [Abstract]
Recorded Balance		4,227	4,584	5,609
Unpaid Contractual Principal Balance		4,227	4,612	5,632
Specific Allowance		50	25	213
Average Investment in Impaired Loans		3,965	4,990	6,657
Interest Income Recognized	[1]	171	200	218
Commercial [Member] | Real Estate [Member]
Loans without a specific valuation allowance [Abstract]
Recorded Balance		29,645	28,480	29,025
Unpaid Contractual Principal Balance		31,409	30,365	29,594
Average Investment in Impaired Loans		30,250	27,753	31,136
Interest Income Recognized	[1]	1,412	1,344	1,609
Loans with a specific valuation allowance [Abstract]
Recorded Balance		1,854	2,985	4,731
Unpaid Contractual Principal Balance		2,983	4,095	5,885
Specific Allowance		605	966	1,035
Average Investment in Impaired Loans		2,051	3,932	4,151
Interest Income Recognized	[1]	1	8	19
Total impaired loans [Abstract]
Recorded Balance		31,499	31,465	33,756
Unpaid Contractual Principal Balance		34,392	34,460	35,479
Specific Allowance		605	966	1,035
Average Investment in Impaired Loans		32,301	31,685	35,287
Interest Income Recognized	[1]	1,413	1,352	1,628
Commercial [Member] | Equipment Lease Financing [Member]
Loans without a specific valuation allowance [Abstract]
Recorded Balance		0	0	0
Unpaid Contractual Principal Balance		0	0	0
Average Investment in Impaired Loans		0	34	0
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		0	0	0
Unpaid Contractual Principal Balance		0	0	0
Specific Allowance		0	0	0
Average Investment in Impaired Loans		0	34	0
Interest Income Recognized	[1]	0	0	0
Commercial [Member] | Other [Member]
Loans without a specific valuation allowance [Abstract]
Recorded Balance		8,285	9,481	11,215
Unpaid Contractual Principal Balance		9,982	11,252	13,155
Average Investment in Impaired Loans		8,774	10,444	11,561
Interest Income Recognized	[1]	530	539	632
Loans with a specific valuation allowance [Abstract]
Recorded Balance		473	0	139
Unpaid Contractual Principal Balance		473	0	139
Specific Allowance		146	0	65
Average Investment in Impaired Loans		285	65	483
Interest Income Recognized	[1]	16	0	0
Total impaired loans [Abstract]
Recorded Balance		8,758	9,481	11,354
Unpaid Contractual Principal Balance		10,455	11,252	13,294
Specific Allowance		146	0	65
Average Investment in Impaired Loans		9,059	10,509	12,044
Interest Income Recognized	[1]	546	539	632
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		1,882	1,564	1,483
Unpaid Contractual Principal Balance		1,882	1,570	1,483
Average Investment in Impaired Loans		1,666	1,591	1,691
Interest Income Recognized	[1]	41	36	52
Loans with a specific valuation allowance [Abstract]
Specific Allowance		0	0	0
Total impaired loans [Abstract]
Recorded Balance		1,882	1,564	1,483
Unpaid Contractual Principal Balance		1,882	1,570	1,483
Specific Allowance		0	0	0
Average Investment in Impaired Loans		1,666	1,591	1,691
Interest Income Recognized	[1]	$ 41	$ 36	$ 52
[1] Cash basis interest is substantially the same as interest income recognized.

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