Condensed Financial Information of Parent Company Only Disclosure: Condensed Cash Flow Statement (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 29,053	$ 42,130
Income (Loss) from Equity Method Investments	2,111	(1,846)
Other Noncash Income (Expense)	6,644	6,535
Increase (Decrease) in Other Operating Assets and Liabilities, Net	(7,599)	372
Net Cash Provided by (Used in) Operating Activities	36,017	32,628
Payments for (Proceeds from) Short-term Investments	(999)	6,849
Payments to Acquire Debt Securities, Available-for-sale	(126,529)	(210,694)
Proceeds from Sale of Debt Securities, Available-for-sale	72,905	193,930
Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-sale	32,813	28,355
Net Cash Provided by (Used in) Investing Activities	(27,690)	27,600
Payments for Repurchase of Common Stock	(4,140)	(46,401)
Payments of Ordinary Dividends, Common Stock	(3,712)	(1,928)
Proceeds from Stock Options Exercised	856	0
Payments Related to Tax Withholding for Share-based Compensation	(905)	(1,659)
Net Cash Provided by (Used in) Financing Activities	(9,717)	(51,749)
Cash and Cash Equivalents, at Carrying Value, Beginning Balance	26,465
Cash and Cash Equivalents, at Carrying Value, Ending Balance	26,173	26,465
Parent Company
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	29,053	42,130
Income (Loss) from Equity Method Investments	(32,459)	(44,854)
Other Noncash Income (Expense)	2,465	2,521
Increase (Decrease) in Other Operating Assets and Liabilities, Net	2,561	(3,121)
Net Cash Provided by (Used in) Operating Activities	1,620	(3,324)
Change In Investments In and Advances To Subsidiaries	17,779	26,847
Payments for (Proceeds from) Short-term Investments	0	3,499
Payments to Acquire Debt Securities, Available-for-sale	(16,000)	(46,605)
Proceeds from Sale of Debt Securities, Available-for-sale	4,469	63,568
Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-sale	429	4,640
Net Cash Provided by (Used in) Investing Activities	6,677	51,949
Payments for Repurchase of Common Stock	(4,140)	(46,401)
Payments of Ordinary Dividends, Common Stock	(3,712)	(1,928)
Proceeds from Stock Options Exercised	856	0
Payments Related to Tax Withholding for Share-based Compensation	(905)	(1,659)
Net Cash Provided by (Used in) Financing Activities	(7,901)	(49,988)
Cash and Cash Equivalents, Period Increase (Decrease)	396	(1,363)
Cash and Cash Equivalents, at Carrying Value, Beginning Balance	2,304	3,667
Cash and Cash Equivalents, at Carrying Value, Ending Balance	$ 2,700	$ 2,304