Fair Value Disclosures [Text Block]: Fair Value, Assets Measured on Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale	$ 443,190	$ 441,912
Equity Securities, FV-NI	6,019	6,120
Corporate Debt Securities
Debt Securities, Available-for-sale	155,521	146,447
Collateralized Mortgage Backed Securities
Debt Securities, Available-for-sale	6,366	6,677
US Treasury Securities
Debt Securities, Available-for-sale	80,775	85,114
US Government Agencies Debt Securities
Debt Securities, Available-for-sale	11	14
US Government-sponsored Enterprises Debt Securities
Debt Securities, Available-for-sale	9,593	9,682
US States and Political Subdivisions Debt Securities
Debt Securities, Available-for-sale	176,772	179,643
Debt Security, Government, Non-US
Debt Securities, Available-for-sale	4,077	4,150
Redeemable Preferred Stock
Debt Securities, Available-for-sale	10,075	10,185
Fair Value, Measurements, Recurring
Debt Securities, Available-for-sale	443,190	441,912
Equity Securities, FV-NI	6,019	6,120
Assets, Fair Value Disclosure	449,209	448,032
Fair Value, Measurements, Recurring | Corporate Debt Securities
Debt Securities, Available-for-sale	155,521	146,447
Fair Value, Measurements, Recurring | Collateralized Mortgage Backed Securities
Debt Securities, Available-for-sale	6,366	6,677
Fair Value, Measurements, Recurring | US Treasury Securities
Debt Securities, Available-for-sale	80,775	85,114
Fair Value, Measurements, Recurring | US Government Agencies Debt Securities
Debt Securities, Available-for-sale	11	14
Fair Value, Measurements, Recurring | US Government-sponsored Enterprises Debt Securities
Debt Securities, Available-for-sale	9,593	9,682
Fair Value, Measurements, Recurring | US States and Political Subdivisions Debt Securities
Debt Securities, Available-for-sale	176,772	179,643
Fair Value, Measurements, Recurring | Debt Security, Government, Non-US
Debt Securities, Available-for-sale	4,077	4,150
Fair Value, Measurements, Recurring | Redeemable Preferred Stock
Debt Securities, Available-for-sale	10,075	10,185
Fair Value, Measurements, Recurring | Common Stock
Equity Securities, FV-NI	4,971	2,490
Fair Value, Measurements, Recurring | Nonredeemable Preferred Stock
Equity Securities, FV-NI	1,048	3,630
Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring
Debt Securities, Available-for-sale	10,075	10,185
Equity Securities, FV-NI	6,019	6,120
Assets, Fair Value Disclosure	16,094	16,305
Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | Corporate Debt Securities
Debt Securities, Available-for-sale	0	0
Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | Collateralized Mortgage Backed Securities
Debt Securities, Available-for-sale	0	0
Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | US Treasury Securities
Debt Securities, Available-for-sale	0	0
Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | US Government Agencies Debt Securities
Debt Securities, Available-for-sale	0	0
Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | US Government-sponsored Enterprises Debt Securities
Debt Securities, Available-for-sale	0	0
Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | US States and Political Subdivisions Debt Securities
Debt Securities, Available-for-sale	0	0
Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | Debt Security, Government, Non-US
Debt Securities, Available-for-sale	0	0
Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | Redeemable Preferred Stock
Debt Securities, Available-for-sale	10,075	10,185
Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | Common Stock
Equity Securities, FV-NI	4,971	2,490
Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | Nonredeemable Preferred Stock
Equity Securities, FV-NI	1,048	3,630
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring
Debt Securities, Available-for-sale	431,279	429,851
Equity Securities, FV-NI	0	0
Assets, Fair Value Disclosure	431,279	429,851
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Corporate Debt Securities
Debt Securities, Available-for-sale	155,521	146,447
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Collateralized Mortgage Backed Securities
Debt Securities, Available-for-sale	6,366	6,677
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | US Treasury Securities
Debt Securities, Available-for-sale	80,775	85,114
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | US Government Agencies Debt Securities
Debt Securities, Available-for-sale	11	14
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | US Government-sponsored Enterprises Debt Securities
Debt Securities, Available-for-sale	9,593	9,682
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | US States and Political Subdivisions Debt Securities
Debt Securities, Available-for-sale	174,936	177,767
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Debt Security, Government, Non-US
Debt Securities, Available-for-sale	4,077	4,150
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Redeemable Preferred Stock
Debt Securities, Available-for-sale	0	0
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Common Stock
Equity Securities, FV-NI	0	0
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Nonredeemable Preferred Stock
Equity Securities, FV-NI	0	0
Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring
Debt Securities, Available-for-sale	1,836	1,876
Equity Securities, FV-NI	0	0
Assets, Fair Value Disclosure	1,836	1,876
Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | Corporate Debt Securities
Debt Securities, Available-for-sale	0	0
Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | Collateralized Mortgage Backed Securities
Debt Securities, Available-for-sale	0	0
Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | US Treasury Securities
Debt Securities, Available-for-sale	0	0
Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | US Government Agencies Debt Securities
Debt Securities, Available-for-sale	0	0
Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | US Government-sponsored Enterprises Debt Securities
Debt Securities, Available-for-sale	0	0
Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | US States and Political Subdivisions Debt Securities
Debt Securities, Available-for-sale	1,836	1,876
Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | Debt Security, Government, Non-US
Debt Securities, Available-for-sale	0	0
Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | Redeemable Preferred Stock
Debt Securities, Available-for-sale	0	0
Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | Common Stock
Equity Securities, FV-NI	0	0
Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | Nonredeemable Preferred Stock
Equity Securities, FV-NI	$ 0	$ 0