Fair Value Disclosures [Text Block]: Fair Value, Assets Measured on Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale	$ 461,426	$ 453,464
Equity Securities, FV-NI	5,543	5,166
Corporate Debt Securities
Debt Securities, Available-for-sale	236,800	197,489
Collateralized Mortgage Backed Securities
Debt Securities, Available-for-sale	5,752	5,840
US Treasury Securities
Debt Securities, Available-for-sale	31,979	62,809
US Government-sponsored Enterprises Debt Securities
Debt Securities, Available-for-sale	6,303	6,486
US States and Political Subdivisions Debt Securities
Debt Securities, Available-for-sale	167,429	167,934
Debt Security, Government, Non-US
Debt Securities, Available-for-sale	7,027	7,044
Redeemable Preferred Stock
Debt Securities, Available-for-sale	6,136	5,859
US Government Agencies Debt Securities
Debt Securities, Available-for-sale		3
Fair Value, Recurring
Debt Securities, Available-for-sale	461,426	453,464
Equity Securities, FV-NI	5,543	5,166
Assets, Fair Value Disclosure	466,969	458,630
Fair Value, Recurring | Corporate Debt Securities
Debt Securities, Available-for-sale	236,800	197,489
Fair Value, Recurring | Collateralized Mortgage Backed Securities
Debt Securities, Available-for-sale	5,752	5,840
Fair Value, Recurring | US Treasury Securities
Debt Securities, Available-for-sale	31,979	62,809
Fair Value, Recurring | US Government-sponsored Enterprises Debt Securities
Debt Securities, Available-for-sale	6,303	6,486
Fair Value, Recurring | US States and Political Subdivisions Debt Securities
Debt Securities, Available-for-sale	167,429	167,934
Fair Value, Recurring | Debt Security, Government, Non-US
Debt Securities, Available-for-sale	7,027	7,044
Fair Value, Recurring | Redeemable Preferred Stock
Debt Securities, Available-for-sale	6,136	5,859
Fair Value, Recurring | Common Stock
Equity Securities, FV-NI	2,649	2,366
Fair Value, Recurring | Nonredeemable Preferred Stock
Equity Securities, FV-NI	2,894	2,800
Fair Value, Recurring | US Government Agencies Debt Securities
Debt Securities, Available-for-sale		3
Fair Value, Inputs, Level 1 | Fair Value, Recurring
Debt Securities, Available-for-sale	6,136	5,859
Equity Securities, FV-NI	5,543	5,166
Assets, Fair Value Disclosure	11,679	11,025
Fair Value, Inputs, Level 1 | Fair Value, Recurring | Corporate Debt Securities
Debt Securities, Available-for-sale	0	0
Fair Value, Inputs, Level 1 | Fair Value, Recurring | Collateralized Mortgage Backed Securities
Debt Securities, Available-for-sale	0	0
Fair Value, Inputs, Level 1 | Fair Value, Recurring | US Treasury Securities
Debt Securities, Available-for-sale	0	0
Fair Value, Inputs, Level 1 | Fair Value, Recurring | US Government-sponsored Enterprises Debt Securities
Debt Securities, Available-for-sale	0	0
Fair Value, Inputs, Level 1 | Fair Value, Recurring | US States and Political Subdivisions Debt Securities
Debt Securities, Available-for-sale	0	0
Fair Value, Inputs, Level 1 | Fair Value, Recurring | Debt Security, Government, Non-US
Debt Securities, Available-for-sale	0	0
Fair Value, Inputs, Level 1 | Fair Value, Recurring | Redeemable Preferred Stock
Debt Securities, Available-for-sale	6,136	5,859
Fair Value, Inputs, Level 1 | Fair Value, Recurring | Common Stock
Equity Securities, FV-NI	2,649	2,366
Fair Value, Inputs, Level 1 | Fair Value, Recurring | Nonredeemable Preferred Stock
Equity Securities, FV-NI	2,894	2,800
Fair Value, Inputs, Level 1 | Fair Value, Recurring | US Government Agencies Debt Securities
Debt Securities, Available-for-sale		0
Fair Value, Inputs, Level 2 | Fair Value, Recurring
Debt Securities, Available-for-sale	453,670	445,896
Equity Securities, FV-NI	0	0
Assets, Fair Value Disclosure	453,670	445,896
Fair Value, Inputs, Level 2 | Fair Value, Recurring | Corporate Debt Securities
Debt Securities, Available-for-sale	236,800	197,489
Fair Value, Inputs, Level 2 | Fair Value, Recurring | Collateralized Mortgage Backed Securities
Debt Securities, Available-for-sale	5,752	5,840
Fair Value, Inputs, Level 2 | Fair Value, Recurring | US Treasury Securities
Debt Securities, Available-for-sale	31,979	62,809
Fair Value, Inputs, Level 2 | Fair Value, Recurring | US Government-sponsored Enterprises Debt Securities
Debt Securities, Available-for-sale	6,303	6,486
Fair Value, Inputs, Level 2 | Fair Value, Recurring | US States and Political Subdivisions Debt Securities
Debt Securities, Available-for-sale	165,809	166,225
Fair Value, Inputs, Level 2 | Fair Value, Recurring | Debt Security, Government, Non-US
Debt Securities, Available-for-sale	7,027	7,044
Fair Value, Inputs, Level 2 | Fair Value, Recurring | Redeemable Preferred Stock
Debt Securities, Available-for-sale	0	0
Fair Value, Inputs, Level 2 | Fair Value, Recurring | Common Stock
Equity Securities, FV-NI	0	0
Fair Value, Inputs, Level 2 | Fair Value, Recurring | Nonredeemable Preferred Stock
Equity Securities, FV-NI	0	0
Fair Value, Inputs, Level 2 | Fair Value, Recurring | US Government Agencies Debt Securities
Debt Securities, Available-for-sale		3
Fair Value, Inputs, Level 3 | Fair Value, Recurring
Debt Securities, Available-for-sale	1,620	1,709
Equity Securities, FV-NI	0	0
Assets, Fair Value Disclosure	1,620	1,709
Fair Value, Inputs, Level 3 | Fair Value, Recurring | Corporate Debt Securities
Debt Securities, Available-for-sale	0	0
Fair Value, Inputs, Level 3 | Fair Value, Recurring | Collateralized Mortgage Backed Securities
Debt Securities, Available-for-sale	0	0
Fair Value, Inputs, Level 3 | Fair Value, Recurring | US Treasury Securities
Debt Securities, Available-for-sale	0	0
Fair Value, Inputs, Level 3 | Fair Value, Recurring | US Government-sponsored Enterprises Debt Securities
Debt Securities, Available-for-sale	0	0
Fair Value, Inputs, Level 3 | Fair Value, Recurring | US States and Political Subdivisions Debt Securities
Debt Securities, Available-for-sale	1,620	1,709
Fair Value, Inputs, Level 3 | Fair Value, Recurring | Debt Security, Government, Non-US
Debt Securities, Available-for-sale	0	0
Fair Value, Inputs, Level 3 | Fair Value, Recurring | Redeemable Preferred Stock
Debt Securities, Available-for-sale	0	0
Fair Value, Inputs, Level 3 | Fair Value, Recurring | Common Stock
Equity Securities, FV-NI	0	0
Fair Value, Inputs, Level 3 | Fair Value, Recurring | Nonredeemable Preferred Stock
Equity Securities, FV-NI	$ 0	0
Fair Value, Inputs, Level 3 | Fair Value, Recurring | US Government Agencies Debt Securities
Debt Securities, Available-for-sale		$ 0