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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		12 Months Ended
		Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Loans with a specific valuation allowance [Abstract]
Specific Allowance		$ 1,631	$ 739	$ 801
Total impaired loans [Abstract]
Recorded balance		50,355	48,185	46,366
Unpaid Contractual Principal Balance		54,879	53,132	50,956
Specific Allowance		1,631	739	801
Average Investment in Impaired Loans		51,120	48,800	47,097
Interest Income Recognized	[1]	581	541	2,171
Commercial [Member] | Construction [Member]
Loans without a specific valuation allowance [Abstract]
Recorded Balance		3,308	4,009	4,100
Unpaid Contractual Principal Balance		3,308	4,009	4,100
Average Investment in Impaired Loans		3,655	4,168	3,923
Interest Income Recognized	[1]	46	37	171
Loans with a specific valuation allowance [Abstract]
Recorded Balance		324		127
Unpaid Contractual Principal Balance		324		127
Specific Allowance		164	0	50
Average Investment in Impaired Loans		324		42
Interest Income Recognized	[1]	3		0
Total impaired loans [Abstract]
Recorded balance		3,632	4,009	4,227
Unpaid Contractual Principal Balance		3,632	4,009	4,227
Specific Allowance		164	0	50
Average Investment in Impaired Loans		3,979	4,168	3,965
Interest Income Recognized	[1]	49	37	171
Commercial [Member] | Real Estate [Member]
Loans without a specific valuation allowance [Abstract]
Recorded Balance		32,407	31,284	29,645
Unpaid Contractual Principal Balance		34,098	33,377	31,409
Average Investment in Impaired Loans		32,811	31,566	30,250
Interest Income Recognized	[1]	347	352	1,412
Loans with a specific valuation allowance [Abstract]
Recorded Balance		1,922	2,105	1,854
Unpaid Contractual Principal Balance		3,060	3,221	2,983
Specific Allowance		847	739	605
Average Investment in Impaired Loans		1,966	2,132	2,051
Interest Income Recognized	[1]	10	0	1
Total impaired loans [Abstract]
Recorded balance		34,329	33,389	31,499
Unpaid Contractual Principal Balance		37,158	36,598	34,392
Specific Allowance		847	739	605
Average Investment in Impaired Loans		34,777	33,698	32,301
Interest Income Recognized	[1]	357	352	1,413
Commercial [Member] | Other [Member]
Loans without a specific valuation allowance [Abstract]
Recorded Balance		8,903	9,183	8,285
Unpaid Contractual Principal Balance		10,598	10,913	9,982
Average Investment in Impaired Loans		8,866	9,332	8,774
Interest Income Recognized	[1]	139	152	530
Loans with a specific valuation allowance [Abstract]
Recorded Balance		1,154		473
Unpaid Contractual Principal Balance		1,154		473
Specific Allowance		620	0	146
Average Investment in Impaired Loans		1,169		285
Interest Income Recognized	[1]	17		16
Total impaired loans [Abstract]
Recorded balance		10,057	9,183	8,758
Unpaid Contractual Principal Balance		11,752	10,913	10,455
Specific Allowance		620	0	146
Average Investment in Impaired Loans		10,035	9,332	9,059
Interest Income Recognized	[1]	156	152	546
Residential [Member] | Construction [Member]
Loans without a specific valuation allowance [Abstract]
Recorded Balance		0	318	0
Unpaid Contractual Principal Balance		0	318	0
Average Investment in Impaired Loans		0	318	106
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	318	0
Unpaid Contractual Principal Balance		0	318	0
Specific Allowance		0	0	0
Average Investment in Impaired Loans		0	318	106
Interest Income Recognized	[1]	0	0	0
Residential [Member] | Real Estate [Member]
Loans without a specific valuation allowance [Abstract]
Recorded Balance		2,337	1,286	1,882
Unpaid Contractual Principal Balance		2,337	1,294	1,882
Average Investment in Impaired Loans		2,329	1,284	1,666
Interest Income Recognized	[1]	19	0	41
Loans with a specific valuation allowance [Abstract]
Specific Allowance		0	0	0
Total impaired loans [Abstract]
Recorded balance		2,337	1,286	1,882
Unpaid Contractual Principal Balance		2,337	1,294	1,882
Specific Allowance		0	0	0
Average Investment in Impaired Loans		2,329	1,284	1,666
Interest Income Recognized	[1]	$ 19	$ 0	$ 41
[1] Cash basis interest is substantially the same as interest income recognized.

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