Derivative Instruments and Hedging Activities - Additional Information (Details)	3 Months Ended
	Mar. 31, 2020 USD ($) swap	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)
Derivative [Line Items]
Number of credit swaps | swap	24
Aggregate fair value of net liability position	$ 43,100,000
Interest rate swaps
Derivative [Line Items]
Accumulated net after-tax losses related to effective cash flow hedges	4,300,000		$ 3,700,000
Estimated amount of interest rate derivatives to be reclassified to interest expense	2,200,000
Fair value hedge | Noninterest Income | Interest rate swaps
Derivative [Line Items]
Fee income related to derivative interest rate swaps executed with commercial loan customers	14,200,000	$ 4,100,000
Derivatives designated as hedging instruments
Derivative [Line Items]
Notional amount	737,215,000		187,281,000
Derivatives designated as hedging instruments | Cash flow hedge
Derivative [Line Items]
Notional amount	600,000,000
Derivatives designated as hedging instruments | Fair value hedge | Interest rate swaps
Derivative [Line Items]
Notional amount	7,215,000		7,281,000
Derivatives not designated as hedging instruments
Derivative [Line Items]
Notional amount	5,606,820,000		4,255,866,000
Aggregate notional amount of derivative asset	151,400,000
Derivatives not designated as hedging instruments | Interest rate swaps
Derivative [Line Items]
Notional amount	$ 5,226,704,000		$ 4,113,106,000
Derivatives not designated as hedging instruments | Fair value hedge | Interest rate swaps
Derivative [Line Items]
Number of instruments held | swap	2
Derivatives not designated as hedging instruments | Fair value hedge | Steepener swap, derivative one
Derivative [Line Items]
Notional amount	$ 10,400,000
Derivatives not designated as hedging instruments | Fair value hedge | Steepener swap, derivative two
Derivative [Line Items]
Notional amount	$ 10,400,000
Minimum | Derivatives designated as hedging instruments | Cash flow hedge
Derivative [Line Items]
Fixed interest rate	0.46%
Maximum | Derivatives designated as hedging instruments | Cash flow hedge
Derivative [Line Items]
Fixed interest rate	0.63%