Derivatives and Hedging Activities Derivatives Fair Value and Balance Sheet Classification (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Other assets
Derivatives, Fair Value [Line Items]
Asset derivatives	$ 22,444	$ 19,133
Other liabilities
Derivatives, Fair Value [Line Items]
Liability derivatives	22,537	19,143
Interest rate products | Derivatives designated as hedging instruments: | Other assets
Derivatives, Fair Value [Line Items]
Asset derivatives	553	555
Interest rate products | Derivatives designated as hedging instruments: | Other liabilities
Derivatives, Fair Value [Line Items]
Liability derivatives	0	80
Interest rate products | Derivatives not designated as hedging instruments: | Other assets
Derivatives, Fair Value [Line Items]
Asset derivatives	21,889	18,575
Interest rate products | Derivatives not designated as hedging instruments: | Other liabilities
Derivatives, Fair Value [Line Items]
Liability derivatives	22,385	18,953
Foreign exchange contracts | Derivatives not designated as hedging instruments: | Other assets
Derivatives, Fair Value [Line Items]
Asset derivatives	0	2
Foreign exchange contracts | Derivatives not designated as hedging instruments: | Other liabilities
Derivatives, Fair Value [Line Items]
Liability derivatives	0	2
Risk participation agreements | Derivatives not designated as hedging instruments: | Other assets
Derivatives, Fair Value [Line Items]
Asset derivatives	2	1
Risk participation agreements | Derivatives not designated as hedging instruments: | Other liabilities
Derivatives, Fair Value [Line Items]
Liability derivatives	$ 152	$ 108