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Securities (Schedule of Information Regarding Securities with Unrealized Losses) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Total temporarily impaired securities Fair Value	$ 72,958	$ 108,745
Total temporarily impaired securities Unrealized Losses	406	863
Total temporarily impaired securities Fair Value	331,813	320,445
Total temporarily impaired securities Unrealized Losses	8,545	13,561
Total temporarily impaired securities Fair Value	404,771	429,190
Total temporarily impaired securities Unrealized Losses	8,951	14,424
Government-sponsored enterprise securities [Member]
AFS Fair Value		4,921
AFS Unrealized Losses		78
AFS Fair Value	18,808	13,682
AFS Unrealized Losses	192	318
Total temporarily impaired securities Fair Value	18,808	18,603
Total temporarily impaired securities Unrealized Losses	192	396
Mortgage-backed securities [Member]
AFS Fair Value	70,478	82,525
AFS Unrealized Losses	346	351
AFS Fair Value	298,133	294,305
AFS Unrealized Losses	8,225	12,939
Total temporarily impaired securities Fair Value	368,611	376,830
Total temporarily impaired securities Unrealized Losses	8,571	13,290
Corporate bonds [Member]
AFS Fair Value	2,480	20,704
AFS Unrealized Losses	60	433
AFS Fair Value	9,049	5,817
AFS Unrealized Losses	110	256
Total temporarily impaired securities Fair Value	11,529	26,521
Total temporarily impaired securities Unrealized Losses	170	689
State and local governments [Member]
HTM Fair Value		595
HTM Unrealized Losses		1
AFS Fair Value	5,823	6,641
AFS Unrealized Losses	18	48
Total temporarily impaired securities Fair Value	5,823	7,236
Total temporarily impaired securities Unrealized Losses	$ 18	$ 49

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