Derivatives and Hedging Activities - Derivatives Fair Value and Balance Sheet Classification (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Other assets
Derivatives, Fair Value [Line Items]
Asset derivatives	$ 53,710	$ 83,304
Other assets | Derivatives designated as hedging instruments: | Interest rate swaps
Derivatives, Fair Value [Line Items]
Asset derivatives	0	0
Other assets | Derivatives not designated as hedging instruments: | Interest rate swaps
Derivatives, Fair Value [Line Items]
Asset derivatives	53,682	83,255
Other assets | Derivatives not designated as hedging instruments: | Risk participation agreements
Derivatives, Fair Value [Line Items]
Asset derivatives	28	49
Other liabilities
Derivatives, Fair Value [Line Items]
Liability derivatives	54,897	85,193
Other liabilities | Derivatives designated as hedging instruments: | Interest rate swaps
Derivatives, Fair Value [Line Items]
Liability derivatives	157	228
Other liabilities | Derivatives not designated as hedging instruments: | Interest rate swaps
Derivatives, Fair Value [Line Items]
Liability derivatives	54,529	84,590
Other liabilities | Derivatives not designated as hedging instruments: | Risk participation agreements
Derivatives, Fair Value [Line Items]
Liability derivatives	$ 211	$ 375