Fair Value Disclosures [Text Block]: Fair Value, Assets Measured on Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale	$ 456,260	$ 453,464
Equity Securities, FV-NI	5,359	5,166
Corporate Debt Securities
Debt Securities, Available-for-sale	218,107	197,489
Collateralized Mortgage Backed Securities
Debt Securities, Available-for-sale	5,793	5,840
US Treasury Securities
Debt Securities, Available-for-sale	44,283	62,809
US Government Agencies Debt Securities
Debt Securities, Available-for-sale	1	3
US Government-sponsored Enterprises Debt Securities
Debt Securities, Available-for-sale	6,395	6,486
US States and Political Subdivisions Debt Securities
Debt Securities, Available-for-sale	168,617	167,934
Debt Security, Government, Non-US
Debt Securities, Available-for-sale	7,020	7,044
Redeemable Preferred Stock
Debt Securities, Available-for-sale	6,044	5,859
Fair Value, Measurements, Recurring
Debt Securities, Available-for-sale	456,260	453,464
Equity Securities, FV-NI	5,359	5,166
Assets, Fair Value Disclosure	461,619	458,630
Fair Value, Measurements, Recurring | Corporate Debt Securities
Debt Securities, Available-for-sale	218,107	197,489
Fair Value, Measurements, Recurring | Collateralized Mortgage Backed Securities
Debt Securities, Available-for-sale	5,793	5,840
Fair Value, Measurements, Recurring | US Treasury Securities
Debt Securities, Available-for-sale	44,283	62,809
Fair Value, Measurements, Recurring | US Government Agencies Debt Securities
Debt Securities, Available-for-sale	1	3
Fair Value, Measurements, Recurring | US Government-sponsored Enterprises Debt Securities
Debt Securities, Available-for-sale	6,395	6,486
Fair Value, Measurements, Recurring | US States and Political Subdivisions Debt Securities
Debt Securities, Available-for-sale	168,617	167,934
Fair Value, Measurements, Recurring | Debt Security, Government, Non-US
Debt Securities, Available-for-sale	7,020	7,044
Fair Value, Measurements, Recurring | Redeemable Preferred Stock
Debt Securities, Available-for-sale	6,044	5,859
Fair Value, Measurements, Recurring | Common Stock
Equity Securities, FV-NI	2,484	2,366
Fair Value, Measurements, Recurring | Nonredeemable Preferred Stock
Equity Securities, FV-NI	2,875	2,800
Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring
Debt Securities, Available-for-sale	6,044	5,859
Equity Securities, FV-NI	5,359	5,166
Assets, Fair Value Disclosure	11,403	11,025
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	6,044	5,859
Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | Common Stock
Equity Securities, FV-NI	2,484	2,366
Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | Nonredeemable Preferred Stock
Equity Securities, FV-NI	2,875	2,800
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring
Debt Securities, Available-for-sale	448,552	445,896
Equity Securities, FV-NI	0	0
Assets, Fair Value Disclosure	448,552	445,896
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Corporate Debt Securities
Debt Securities, Available-for-sale	218,107	197,489
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Collateralized Mortgage Backed Securities
Debt Securities, Available-for-sale	5,793	5,840
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | US Treasury Securities
Debt Securities, Available-for-sale	44,283	62,809
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | US Government Agencies Debt Securities
Debt Securities, Available-for-sale	1	3
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | US Government-sponsored Enterprises Debt Securities
Debt Securities, Available-for-sale	6,395	6,486
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | US States and Political Subdivisions Debt Securities
Debt Securities, Available-for-sale	166,953	166,225
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Debt Security, Government, Non-US
Debt Securities, Available-for-sale	7,020	7,044
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	1,664	1,709
Equity Securities, FV-NI	0	0
Assets, Fair Value Disclosure	1,664	1,709
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	1,664	1,709
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