Derivatives and Hedging Activities Derivatives Fair Value and Balance Sheet Classification (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Other assets
Derivatives, Fair Value [Line Items]
Asset derivatives	$ 23,952	$ 22,444
Other assets | Derivatives designated as hedging instruments: | Interest rate products
Derivatives, Fair Value [Line Items]
Asset derivatives	205	553
Other assets | Derivatives not designated as hedging instruments: | Interest rate products
Derivatives, Fair Value [Line Items]
Asset derivatives	23,609	21,889
Other assets | Derivatives not designated as hedging instruments: | Risk participation agreements
Derivatives, Fair Value [Line Items]
Asset derivatives	138	2
Other liabilities
Derivatives, Fair Value [Line Items]
Liability derivatives	24,480	22,537
Other liabilities | Derivatives designated as hedging instruments: | Interest rate products
Derivatives, Fair Value [Line Items]
Liability derivatives	0	0
Other liabilities | Derivatives not designated as hedging instruments: | Interest rate products
Derivatives, Fair Value [Line Items]
Liability derivatives	24,296	22,385
Other liabilities | Derivatives not designated as hedging instruments: | Risk participation agreements
Derivatives, Fair Value [Line Items]
Liability derivatives	$ 184	$ 152