Comprehensive Income (Loss) OCI Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Equity [Abstract]
Change in fair value of debt securities, pre tax	$ 9,574	$ 4,040
Change in fair value of debt securities, tax expense (benefit)	(2,136)	(907)
Change in fair value of debt securities, after tax	7,438	3,133
Net security gains (losses) reclassifed into non-interest income, pre tax	100	(1)
Net security gains (losses) reclassified into non-interest income, tax expense (benefit)	(22)	0
Net security gains (losses) reclassified into non-interest income, after tax	78	(1)
Net change in fair value of debt securities, pre tax	9,474	4,041
Net change in fair value of debt securities, tax expense (benefit)	(2,114)	(907)
Net change in fair value of debt securities, after tax	7,360	3,134
Change in fair value of cash flow hedges, pre tax	(2,844)	0
Change in fair value of cash flow hedges, tax expense (benefit)	799	0
Change in fair value of cash flow hedges, after tax	(2,045)	0
Net cash flow hedges gains (losses) reclassified into interest expense, pre tax	25	0
Net cash flow hedges gains (losses) reclassified into interest expense, tax expense (benefit)	(7)	0
Net cash flow hedges gains (losses) reclassified into interest expense, after tax	18	0
Net change in fair value of cash flow hedges, pre tax	(2,869)	0
Net change in fair value of cash flow hedges, tax expense (benefit)	806	0
Net change in fair value of cash flow hedges, after tax	(2,063)	0
Other comprehensive income (loss), net, pre tax	6,605	4,041
Other comprehensive income (loss), net, tax expense (benefit)	(1,308)	(907)
Other comprehensive income, net of tax	$ 5,297	$ 3,134