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Derivative Instruments - Hedge Derivatives (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 16, 2020	Mar. 31, 2020
Derivative [Line Items]
Derivative, Gain (Loss) on Derivative, Net	$ (1,109,000)	$ (80,000)	$ (33,000)
Gain (loss) on cash flow hedges reclassified from other comprehensive income into net income, net of tax	5,542,000	1,588,000	(657,000)
Amortization	2,300,000	2,700,000	3,000,000.0
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	6,600,000
Swap Termination Payment	14,000,000.0
Cash flow hedge
Derivative [Line Items]
Unrealized Gain (Loss) in Accumulated Other Comprehensive Income	16,500,000
Notional				$ 99,000,000.0	$ 1,300,000,000
Gain (loss) on cash flow hedges reclassified from other comprehensive income into net income, net of tax	4,700,000
Hedging derivative | Cash flow hedge
Derivative [Line Items]
Unrealized Gain (Loss) in Accumulated Other Comprehensive Income	65,426,000	(2,581,000)	2,660,000
Hedging derivative | Fair value hedge
Derivative [Line Items]
Amortization	4,300,000	2,700,000
Hedging derivative | Fair value hedge | Securities
Derivative [Line Items]
Derivative Instruments and Hedges, Assets	841,543,000	551,789,000
Fair Value Hedging Adjustment	67,314,000	40,778,000
Gain (Loss) on Fair Value Hedges Recognized in Earnings	(26,536,000)	(25,982,000)	(14,796,000)
Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge	26,536,000	25,982,000	14,796,000
Notional	708,931,000	477,905,000
Fair Value Hedges, Net	(67,314,000)	(40,778,000)
Hedging derivative | Fair value hedge | Loans
Derivative [Line Items]
Gain (Loss) on Fair Value Hedges Recognized in Earnings	0	(6,915,000)	(7,037,000)
Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge	0	6,915,000	7,037,000
Asset derivatives | Hedging derivative | Cash flow hedge
Derivative [Line Items]
Unrealized Gain (Loss) in Accumulated Other Comprehensive Income	$ 62,979,000	(1,432,000)	0
Description of Location of Interest Rate Derivatives on Balance Sheet	Other assets
Pay Rate (as percent)	0.00%
Receive Rate	2.25% minus 1 month LIBOR
Notional	$ 1,500,000,000	2,800,000,000
Cash Flow Hedges Derivative Instruments at Fair Value, Net	$ 124,585,000	87,422,000
Weighted Average Remaining Maturity Derivative	3 years 11 months 4 days
Asset derivatives | Hedging derivative | Fair value hedge | Securities
Derivative [Line Items]
Description of Location of Interest Rate Derivatives on Balance Sheet	Other assets
Pay Rate (as percent)	0.58%
Notional	$ 231,421,000	0
Weighted Average Remaining Maturity Derivative	8 years 7 months 2 days
Derivative, Underlying Basis	Federal funds
Fair Value Hedge Assets	$ 4,696,000	0
Liability derivatives | Hedging derivative | Cash flow hedge
Derivative [Line Items]
Unrealized Gain (Loss) in Accumulated Other Comprehensive Income	$ 2,447,000	(1,149,000)	$ 2,660,000
Description of Location of Interest Rate Derivatives on Balance Sheet	Other liabilities
Pay Rate (as percent)	0.00%
Notional	$ 0	99,000,000
Cash Flow Hedges Derivative Instruments at Fair Value, Net	$ 0	(3,312,000)
Liability derivatives | Hedging derivative | Fair value hedge | Securities
Derivative [Line Items]
Description of Location of Interest Rate Derivatives on Balance Sheet	Other liabilities
Pay Rate (as percent)	3.08%
Notional	$ 477,510,000	477,905,000
Weighted Average Remaining Maturity Derivative	6 years 14 days
Derivative, Underlying Basis	3 month LIBOR
Fair Value Hedge Liabilities	$ (72,010,000)	$ (40,778,000)

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Fixed interest rate related to the interest rate derivative.

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Carrying amount as of the balance sheet date of the asset arising from derivative instruments and hedging activities, which are expected to be converted into cash or otherwise disposed of within a year or the normal operating cycle, if longer.

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