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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, 2017	Dec. 31, 2016
Total temporarily impaired securities Fair Value	$ 116,928	$ 232,817
Total temporarily impaired securities Unrealized Losses	564	4,138
Total temporarily impaired securities Fair Value	25,998	19,943
Total temporarily impaired securities Unrealized Losses	573	622
Total temporarily impaired securities Fair Value	142,926	252,760
Total temporarily impaired securities Unrealized Losses	1,137	4,760
Government-sponsored enterprise securities [Member]
AFS Fair Value	6,491	7,990
AFS Unrealized Losses	9	7
AFS Fair Value
AFS Unrealized Losses
Total AFS Fair Value	6,491	7,990
Total AFS Unrealized Losses	9	7
Mortgage-backed securities [Member]
AFS Fair Value	110,437	196,999
AFS Unrealized Losses	555	3,841
AFS Fair Value	24,250	19,001
AFS Unrealized Losses	501	552
Total AFS Fair Value	134,687	216,000
Total AFS Unrealized Losses	1,056	4,393
Corporate bonds [Member]
AFS Fair Value		27,027
AFS Unrealized Losses		259
AFS Fair Value	935	935
AFS Unrealized Losses	65	65
Total AFS Fair Value	935	27,962
Total AFS Unrealized Losses	65	324
Equity securities [Member]
AFS Fair Value
AFS Unrealized Losses
AFS Fair Value		7
AFS Unrealized Losses		5
Total AFS Fair Value		7
Total AFS Unrealized Losses		5
State and local governments [Member]
AFS Fair Value		801
AFS Unrealized Losses		31
AFS Fair Value	813
AFS Unrealized Losses	7
Total AFS Fair Value	813	801
Total AFS Unrealized Losses	$ 7	$ 31

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