Fair Value Disclosures [Text Block]: Fair Value, Assets Measured on Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale	$ 414,004	$ 384,974
Equity Securities, FV-NI	2,959	3,747
Corporate Debt Securities
Debt Securities, Available-for-sale	137,970	162,023
Collateralized Mortgage Backed Securities
Debt Securities, Available-for-sale	5,366	5,382
US Treasury Securities
Debt Securities, Available-for-sale	51,523	50,549
US Government-sponsored Enterprises Debt Securities
Debt Securities, Available-for-sale	5,867	6,123
US States and Political Subdivisions Debt Securities
Debt Securities, Available-for-sale	206,337	154,008
Debt Security, Government, Non-US
Debt Securities, Available-for-sale	6,941	6,889
Fair Value, Recurring
Debt Securities, Available-for-sale	414,004	384,974
Equity Securities, FV-NI	2,959	3,747
Assets, Fair Value Disclosure	416,963	388,721
Fair Value, Recurring | Corporate Debt Securities
Debt Securities, Available-for-sale	137,970	162,023
Fair Value, Recurring | Collateralized Mortgage Backed Securities
Debt Securities, Available-for-sale	5,366	5,382
Fair Value, Recurring | US Treasury Securities
Debt Securities, Available-for-sale	51,523	50,549
Fair Value, Recurring | US Government-sponsored Enterprises Debt Securities
Debt Securities, Available-for-sale	5,867	6,123
Fair Value, Recurring | US States and Political Subdivisions Debt Securities
Debt Securities, Available-for-sale	206,337	154,008
Fair Value, Recurring | Debt Security, Government, Non-US
Debt Securities, Available-for-sale	6,941	6,889
Fair Value, Recurring | Common Stock
Equity Securities, FV-NI	2,128	2,864
Fair Value, Recurring | Nonredeemable Preferred Stock
Equity Securities, FV-NI	831	883
Fair Value, Inputs, Level 1 | Fair Value, Recurring
Debt Securities, Available-for-sale	0	0
Equity Securities, FV-NI	2,959	3,747
Assets, Fair Value Disclosure	2,959	3,747
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 | Common Stock
Equity Securities, FV-NI	2,128	2,864
Fair Value, Inputs, Level 1 | Fair Value, Recurring | Nonredeemable Preferred Stock
Equity Securities, FV-NI	831	883
Fair Value, Inputs, Level 2 | Fair Value, Recurring
Debt Securities, Available-for-sale	412,523	383,445
Equity Securities, FV-NI	0	0
Assets, Fair Value Disclosure	412,523	383,445
Fair Value, Inputs, Level 2 | Fair Value, Recurring | Corporate Debt Securities
Debt Securities, Available-for-sale	137,970	162,023
Fair Value, Inputs, Level 2 | Fair Value, Recurring | Collateralized Mortgage Backed Securities
Debt Securities, Available-for-sale	5,366	5,382
Fair Value, Inputs, Level 2 | Fair Value, Recurring | US Treasury Securities
Debt Securities, Available-for-sale	51,523	50,549
Fair Value, Inputs, Level 2 | Fair Value, Recurring | US Government-sponsored Enterprises Debt Securities
Debt Securities, Available-for-sale	5,867	6,123
Fair Value, Inputs, Level 2 | Fair Value, Recurring | US States and Political Subdivisions Debt Securities
Debt Securities, Available-for-sale	204,856	152,479
Fair Value, Inputs, Level 2 | Fair Value, Recurring | Debt Security, Government, Non-US
Debt Securities, Available-for-sale	6,941	6,889
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 3 | Fair Value, Recurring
Debt Securities, Available-for-sale	1,481	1,529
Equity Securities, FV-NI	0	0
Assets, Fair Value Disclosure	1,481	1,529
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	1,481	1,529
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 | 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