Derivative Financial Instruments - Fair Value of Derivative Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Derivatives, Fair Value [Line Items]
Total Asset Derivatives	$ 36,433	$ 11,686
Total Liability Derivatives	43,631	15,899
Derivatives designated as hedging instruments
Derivatives, Fair Value [Line Items]
Total Asset Derivatives	35,388	11,422
Total Liability Derivatives	43,631	15,861
Derivatives designated as hedging instruments | Interest rate contracts | Other assets
Derivatives, Fair Value [Line Items]
Total Asset Derivatives	35,388	11,422
Derivatives designated as hedging instruments | Interest rate contracts | Other liabilities
Derivatives, Fair Value [Line Items]
Total Liability Derivatives	43,631	15,861
Derivatives not designated as hedging instruments
Derivatives, Fair Value [Line Items]
Total Asset Derivatives	1,045	264
Total Liability Derivatives	0	38
Derivatives not designated as hedging instruments | Mortgage loan contracts | Other assets
Derivatives, Fair Value [Line Items]
Total Asset Derivatives	1,045	264
Derivatives not designated as hedging instruments | Mortgage loan contracts | Other liabilities
Derivatives, Fair Value [Line Items]
Total Liability Derivatives	$ 0	$ 38