Supplemental Comprehensive Income Disclosures (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Supplemental Comprehensive Income Disclosures [Abstract]
Unrealized holding gains on securities arising during the period	$ 3,152	$ (5,382)	$ 22,055	$ (8,704)
Reclassification adjustment for gains on securities included in net income	(9)	0	(15)	(8,102)
Total unrealized gains on securities	3,143	(5,382)	22,040	(16,806)
Unrealized holding (losses) gains on derivatives arising during the period	(124)	198	9	165
Unrealized holding gains on securities arising during the period	(663)	1,130	(4,632)	1,828
Reclassification adjustment for gains on derivatives included in net income, before Tax	0	0	0	10
Total unrealized gain on derivatives	(124)	198	9	175
Reclassification adjustment for gains on securities included in net income	2	0	3	1,701
Total other comprehensive (loss) income	3,019	(5,184)	22,049	(16,631)
Other Comprehensive Income (Loss), Securities, Available-for-sale, Tax	(661)	1,130	(4,629)	3,529
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax	26	(42)	(2)	(35)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax	0	0	0	(3)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax, Total	26	(42)	(2)	(38)
Other Comprehensive Income (Loss), Tax	(635)	1,088	(4,631)	3,491
Other comprehensive income (loss) before reclassification adjustment	2,489	(4,252)	17,423	(6,876)
Total unrealized (losses) gains on securities	2,482	(4,252)	17,411	(13,277)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	(98)	156	7	130
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	0	0	0	(7)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Total	(98)	156	7	137
Total other comprehensive (loss) income	2,384	(4,096)	17,418	(13,140)
Reclassification adjustment for gains on securities included in net income	$ 7	$ 0	$ 12	$ 6,401