Supplemental Comprehensive Income Disclosures (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Supplemental Comprehensive Income Disclosures [Abstract]
Unrealized holding gains on securities arising during the period	$ 9,030	$ (3,982)
Reclassification adjustment for gains on securities included in net income	0	(2,840)
Total unrealized gains on securities	9,030	(6,822)
Unrealized holding gains (losses) on derivatives arising during the period	133	(130)
Unrealized holding gains on securities arising during the period	(1,896)	837
Reclassification adjustment for gains on derivatives included in net income, before Tax	0	0
Total unrealized gain on derivatives	133	(130)
Reclassification adjustment for gains on securities included in net income	0	596
Total other comprehensive (loss) income	9,163	(6,952)
Other Comprehensive Income (Loss), Securities, Available-for-sale, Tax	(1,896)	1,433
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax	(28)	27
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax	0	0
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax, Total	(28)	27
Other Comprehensive Income (Loss), Tax	(1,924)	1,460
Other comprehensive income (loss) before reclassification adjustment	7,134	(3,145)
Total unrealized (losses) gains on securities	7,134	(5,389)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	105	(103)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	0	0
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Total	105	(103)
Total other comprehensive (loss) income	7,239	(5,492)
Reclassification adjustment for gains on securities included in net income	$ 0	$ 2,244