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Securities (Schedule of Information Regarding Securities with Unrealized Losses) (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Total temporarily impaired securities Fair Value	$ 262,281	$ 214,027
Total temporarily impaired securities Unrealized Losses	9,147	1,782
Total temporarily impaired securities Fair Value	125,104	128,965
Total temporarily impaired securities Unrealized Losses	5,379	1,972
Total temporarily impaired securities Fair Value	387,385	342,992
Total temporarily impaired securities Unrealized Losses	14,526	3,754
Government-sponsored enterprise securities [Member]
AFS Fair Value	9,687	10,897
AFS Unrealized Losses	313	103
AFS Fair Value	8,735	2,970
AFS Unrealized Losses	265	30
Total temporarily impaired securities Fair Value	18,422	13,867
Total temporarily impaired securities Unrealized Losses	578	133
Mortgage-backed securities [Member]
AFS Fair Value	211,002	192,702
AFS Unrealized Losses	8,222	1,582
AFS Fair Value	115,439	125,060
AFS Unrealized Losses	5,044	1,877
Total temporarily impaired securities Fair Value	326,441	317,762
Total temporarily impaired securities Unrealized Losses	13,266	3,459
Corporate bonds [Member]
AFS Fair Value	31,235	2,500
AFS Unrealized Losses	521	49
AFS Fair Value	930	935
AFS Unrealized Losses	70	65
Total temporarily impaired securities Fair Value	32,165	3,435
Total temporarily impaired securities Unrealized Losses	591	114
State and local governments [Member]
HTM Fair Value	10,357	7,928
HTM Unrealized Losses	91	48
AFS Fair Value
AFS Unrealized Losses
Total temporarily impaired securities Fair Value	10,357	7,928
Total temporarily impaired securities Unrealized Losses	$ 91	$ 48

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