Comprehensive Income (Loss) OCI Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Equity [Abstract]
Change in fair value of debt securities, pre tax	$ 8,256	$ 10,454	$ 17,830	$ 14,494
Change in fair value of debt securities, tax (expense) benefit	(1,826)	(2,327)	(3,962)	(3,234)
Change in fair value of debt securities, after tax	6,430	8,127	13,868	11,260
Net security gains (losses) reclassifed into non-interest income, pre tax	0	147	100	146
Net security gains (losses) reclassified into non-interest income, tax expense (benefit)	0	(32)	(22)	(32)
Net security gains (losses) reclassified into non-interest income, after tax	0	115	78	114
Net change in fair value of debt securities, pre tax	8,256	10,307	17,730	14,348
Net change in fair value of debt securities, tax expense (benefit)	(1,826)	(2,295)	(3,940)	(3,202)
Net change in fair value of debt securities, after tax	6,430	8,012	13,790	11,146
Change in fair value of cash flow hedges, pre tax	(504)	0	(3,348)	0
Change in fair value of cash flow hedges, tax expense (benefit)	142	0	941	0
Change in fair value of cash flow hedges, after tax	(362)	0	(2,407)	0
Less: net cash flow hedges gains (losses) reclassified into interest expense, pre tax	(85)	0	(60)	0
Less: net cash flow hedges gains (losses) reclassified into interest expense, tax expense (benefit)	24	0	17	0
Less: net cash flow hedges gains (losses) reclassified into interest expense, after tax	(61)	0	(43)	0
Net change in fair value of cash flow hedges, pre tax	(419)	0	(3,288)	0
Net change in fair value of cash flow hedges, tax expense (benefit)	118	0	924	0
Net change in fair value of cash flow hedges, after tax	(301)	0	(2,364)	0
Other comprehensive income (loss), net, pre tax	7,837	10,307	14,442	14,348
Other comprehensive income (loss), net, tax expense (benefit)	(1,708)	(2,295)	(3,016)	(3,202)
Other comprehensive income, net of tax	$ 6,129	$ 8,012	$ 11,426	$ 11,146