Derivatives and Hedging Activities Derivatives Fair Value and Balance Sheet Classification (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Other assets
Derivatives, Fair Value [Line Items]
Asset derivatives	$ 33,852	$ 22,444
Other assets | Derivatives designated as hedging instruments: | Interest rate swaps
Derivatives, Fair Value [Line Items]
Asset derivatives	5	553
Other assets | Derivatives not designated as hedging instruments: | Interest rate swaps
Derivatives, Fair Value [Line Items]
Asset derivatives	33,835	21,889
Other assets | Derivatives not designated as hedging instruments: | Risk participation agreements
Derivatives, Fair Value [Line Items]
Asset derivatives	12	2
Other liabilities
Derivatives, Fair Value [Line Items]
Liability derivatives	34,858	22,537
Other liabilities | Derivatives designated as hedging instruments: | Interest rate swaps
Derivatives, Fair Value [Line Items]
Liability derivatives	0	0
Other liabilities | Derivatives not designated as hedging instruments: | Interest rate swaps
Derivatives, Fair Value [Line Items]
Liability derivatives	34,586	22,385
Other liabilities | Derivatives not designated as hedging instruments: | Risk participation agreements
Derivatives, Fair Value [Line Items]
Liability derivatives	$ 272	$ 152