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Segment Reporting (Business Segment Assets) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Segment Reporting Information [Line Items]    
Goodwill $ 65,840 $ 65,840
Other intangible assets, net 8,575 8,863
Assets 4,152,432 4,105,210
Banking [Member]    
Segment Reporting Information [Line Items]    
Goodwill 48,536 48,536
Other intangible assets, net 329 373
Assets 4,116,335 4,069,086
Non-Banking [Member]    
Segment Reporting Information [Line Items]    
Goodwill 17,304 17,304
Other intangible assets, net 8,246 8,490
Assets 30,714 31,466
Holding Company and Other [Member]    
Segment Reporting Information [Line Items]    
Assets $ 5,383 $ 4,658