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 |