Other Comprehensive Income (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Securities available for sale and transferred securities: Before Tax Amount
Change in net unrealized gain/loss during the period		$ (872)	$ 2,579	$ (4,429)	$ 4,158
Reclassification adjustment for net gains included in net income	[1]	0	(267)	0	(267)
Total other comprehensive loss		(872)	2,312	(4,429)	3,891
Securities available for sale and transferred securities: Tax Expense (Benefit)
Change in net unrealized gain/loss during the period		183	(902)	930	(1,455)
Reclassification adjustment for net gains included in net income		0	93	0	93
Total other comprehensive loss		183	(808)	930	(1,361)
Securities available for sale and transferred securities: Net of Tax Amount
Change in net unrealized gain/loss during the period		(689)	1,677	(3,499)	2,703
Securities Available For Sale, Amounts reclassified from accumulated other comprehensive income		0	(173)	0	(173)
Other comprehensive income		$ (689)	$ 1,504	$ (3,499)	$ 2,530

[1] Amounts are included in gains on sale or call of securities on the consolidated condensed statements of income. Income tax expense associated with the reclassification adjustments, included in federal income taxes, for the three months ended June 30, 2018 and 2017 was $0 and $93, respectively. Income tax expense associated with the reclassification adjustments, included in federal income taxes, for the six months ended June 30, 2018 and 2017 was $0 and $93, respectively.