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Derivative Instruments - Hedge Derivatives (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Derivative [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income (Loss)	$ 34,300,000
Net (gain) loss on cash flow hedges reclassified from other comprehensive income into net income, net of tax	(4,338,000)	$ 156,000	$ (6,526,000)	$ 1,858,000
Notional Amount	1,500,000,000		1,500,000,000
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months			10,600,000
Not Designated as Hedging Instrument
Derivative [Line Items]
Notional Amount	3,269,178,000		3,269,178,000		$ 3,131,832,000
Cash flow hedge | Hedging derivative
Derivative [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income (Loss)	0	(3,026,000)	$ (15,034,000)	67,202,000
Cash flow hedge | Hedging derivative | Asset derivatives
Derivative [Line Items]
Description of Location of Interest Rate Cash Flow Hedge Derivative on Balance Sheet			Other assets		Other assets
Forecasted Notional Amount	0		$ 0		$ 1,500,000,000
Cash Flow Hedges Derivative Instruments at Fair Value, Net	0		0		124,585,000
Amount of Gain (Loss) Recognized in Other Comprehensive Income (Loss)	0	(3,506,000)	(15,034,000)	68,161,000
Cash flow hedge | Hedging derivative | Liability derivatives
Derivative [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income (Loss)	0	480,000	0	(959,000)
Fair value hedge | Hedging derivative
Derivative [Line Items]
Forecasted Notional Amount	1,031,490,000		1,031,490,000		708,931,000
Fair Value Hedge Assets	(36,790,000)		(36,790,000)		(67,314,000)
Fair value hedge | Hedging derivative | Securities
Derivative [Line Items]
Gain (Loss) on Fair Value Hedges Recognized in Earnings	3,850,000	4,996,000	30,524,000	(36,436,000)
Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge	(3,850,000)	(4,996,000)	(30,524,000)	36,436,000
Derivative Instruments and Hedges, Assets	1,198,990,000		1,198,990,000		841,543,000
Fair Value Hedging Adjustment	36,790,000		36,790,000		67,314,000
Fair value hedge | Hedging derivative | Securities | Asset derivatives
Derivative [Line Items]
Forecasted Notional Amount	$ 464,762,000		$ 464,762,000		$ 231,421,000
Description of Location of Interest Rate Fair Value Hedge Derivative on Balance Sheet			Other assets		Other assets
Weighted Average Remaining Maturity			5 years 7 months 28 days
Pay Rate (as percent)	0.54%		0.54%
Derivative, Type of Interest Rate Paid on Swap			Federal Funds
Fair Value Hedge Assets	$ 11,989,000		$ 11,989,000		$ 4,696,000
Fair value hedge | Hedging derivative | Securities | Liability derivatives
Derivative [Line Items]
Forecasted Notional Amount	$ 566,728,000		$ 566,728,000		$ 477,510,000
Description of Location of Interest Rate Fair Value Hedge Derivative on Balance Sheet			Other liabilities		Other liabilities
Weighted Average Remaining Maturity			5 years 1 month 24 days
Pay Rate (as percent)	2.71%		2.71%
Derivative, Type of Interest Rate Paid on Swap			3 month LIBOR/Federal Funds
Fair Value Hedge Assets	$ (48,779,000)		$ (48,779,000)		$ (72,010,000)
Fair value hedge | Hedging derivative | Securities | LIBOR
Derivative [Line Items]
Forecasted Notional Amount	477,500,000		477,500,000
Fair value hedge | Hedging derivative | Securities | Federal Funds Rate
Derivative [Line Items]
Forecasted Notional Amount	554,000,000		554,000,000
Fair value hedge | Hedging derivative | Loans
Derivative [Line Items]
Amortization expense, reduction to interest income on loans	$ 726,000	$ 1,200,000	$ 2,600,000	$ 3,300,000

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