Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block]: Schedule of Available-for-sale Securities Reconciliation (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Available For Sale Debt Securities Amortized Cost Basis	$ 448,161	$ 460,435
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	1,088	1,241
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	7,337	12,189
Available-for-sale Securities, Debt Securities	441,912	449,487
Available For Sale Equity Securities Amortized Cost Basis	5,200	5,200
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax	448	208
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax	18	75
Available-for-sale Securities, Equity Securities	5,630	5,333
Corporate Debt Securities
Available For Sale Debt Securities Amortized Cost Basis	148,996	192,976
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	298	209
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	2,847	5,490
Available-for-sale Securities, Debt Securities	146,447	187,695
Residential Mortgage Backed Securities Member
Available For Sale Debt Securities Amortized Cost Basis	6,857	6,021
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	0	8
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	180	116
Available-for-sale Securities, Debt Securities	6,677	5,913
US Treasury Securities
Available For Sale Debt Securities Amortized Cost Basis	85,510	43,417
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	0	133
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	396	441
Available-for-sale Securities, Debt Securities	85,114	43,109
US Government Agencies Debt Securities
Available For Sale Debt Securities Amortized Cost Basis	14	22
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	0	1
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	0	0
Available-for-sale Securities, Debt Securities	14	23
US Government-sponsored Enterprises Debt Securities
Available For Sale Debt Securities Amortized Cost Basis	9,887	10,301
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	0	1
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	205	422
Available-for-sale Securities, Debt Securities	9,682	9,880
US States and Political Subdivisions Debt Securities
Available For Sale Debt Securities Amortized Cost Basis	182,664	191,146
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	598	780
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	3,619	5,115
Available-for-sale Securities, Debt Securities	179,643	186,811
Foreign Government Debt
Available For Sale Debt Securities Amortized Cost Basis	4,227	5,098
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	13	13
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	90	157
Available-for-sale Securities, Debt Securities	4,150	4,954
Redeemable Preferred Stock
Available For Sale Debt Securities Amortized Cost Basis	10,006	11,454
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	179	96
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	0	448
Available-for-sale Securities, Debt Securities	10,185	11,102
COMMON STOCK, AMOUNT
Available For Sale Equity Securities Amortized Cost Basis	1,612	1,612
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax	388	178
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax	0	0
Available-for-sale Securities, Equity Securities	2,000	1,790
Nonredeemable Preferred Stock
Available For Sale Equity Securities Amortized Cost Basis	3,588	3,588
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax	60	30
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax	18	75
Available-for-sale Securities, Equity Securities	$ 3,630	$ 3,543

Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

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