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Derivative Instruments - Hedge Derivatives (Details) - USD ($)		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Oct. 24, 2018
Derivative [Line Items]
Closed Portfolio and Beneficial Interest, Last-of-Layer, Amortized Cost		$ 2,700,000,000
Description of Location of Gain (Loss) on Interest Rate Derivative on Income Statement		Other noninterest income
Derivative, Gain (Loss) on Derivative, Net		$ (80,000)	$ (33,000)	$ 39,000
Gain on cash flow hedges reclassified from other comprehensive income into net income, net of tax		1,588,000	(657,000)	(347,000)
Amortization		2,700,000	3,000,000.0	2,500,000
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months		826,000
Payments for purchase of interest rate floors		92,900,000
Swap Termination Payment		14,000,000.0
Cash flow hedge
Derivative [Line Items]
Unrealized Gain (Loss) in Accumulated Other Comprehensive Income		1,000,000.0
Notional					$ 101,000,000.0
Hedging derivative | Cash flow hedge
Derivative [Line Items]
Unrealized Gain (Loss) in Accumulated Other Comprehensive Income		(2,581,000)	2,660,000	2,487,000
Hedging derivative | Fair value hedge
Derivative [Line Items]
Amortization		2,700,000
Hedging derivative | Fair value hedge | Loans
Derivative [Line Items]
Derivative Instruments and Hedges, Assets	[1]	0	907,037,000
Fair Value Hedging Adjustment	[1]	0	7,037,000
Hedging derivative | Fair value hedge | Securities
Derivative [Line Items]
Derivative Instruments and Hedges, Assets		551,789,000	529,859,000
Fair Value Hedging Adjustment		40,778,000	14,796,000
Asset derivatives | Hedging derivative | Cash flow hedge
Derivative [Line Items]
Unrealized Gain (Loss) in Accumulated Other Comprehensive Income		$ (1,432,000)	0	0
Description of Location of Interest Rate Derivatives on Balance Sheet		Other assets
Weighted Average Remaining Maturity Derivative		3 years 6 months
Cash Flow Hedges Derivative Instruments at Fair Value, Net		$ 87,422,000	0
Notional		2,800,000,000	0
Liability derivatives | Hedging derivative | Cash flow hedge
Derivative [Line Items]
Unrealized Gain (Loss) in Accumulated Other Comprehensive Income		$ (1,149,000)	2,660,000	2,487,000
Description of Location of Interest Rate Derivatives on Balance Sheet		Other liabilities
Weighted Average Remaining Maturity Derivative		2 years 4 months 2 days
Pay Rate (as percent)		3.09%
Cash Flow Hedges Derivative Instruments at Fair Value, Net		$ (3,312,000)	(1,757,000)
Notional		$ 99,000,000	99,000,000
Liability derivatives | Hedging derivative | Fair value hedge
Derivative [Line Items]
Weighted Average Remaining Maturity Derivative		7 years 14 days
Pay Rate (as percent)		3.08%
Cash Flow Hedges Derivative Instruments at Fair Value, Net		$ (40,778,000)	(21,833,000)
Notional		$ 477,905,000	1,377,905,000
Liability derivatives | Hedging derivative | Fair value hedge | Loans
Derivative [Line Items]
Description of Location of Interest Rate Derivatives on Balance Sheet		Other liabilities
Weighted Average Remaining Maturity Derivative		0 years
Pay Rate (as percent)		0.00%
Cash Flow Hedges Derivative Instruments at Fair Value, Net		$ 0	(7,037,000)
Description of Location of Gain (Loss) on Interest Rate Derivative on Income Statement		Interest income on loans
Gain (Loss) on Fair Value Hedges Recognized in Earnings		$ (6,915,000)	(7,037,000)	0
Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge		6,915,000	7,037,000	0
Notional		$ 0	900,000,000
Liability derivatives | Hedging derivative | Fair value hedge | Securities
Derivative [Line Items]
Description of Location of Interest Rate Derivatives on Balance Sheet		Other liabilities
Weighted Average Remaining Maturity Derivative		7 years 14 days
Pay Rate (as percent)		3.08%
Cash Flow Hedges Derivative Instruments at Fair Value, Net		$ (40,778,000)	(14,796,000)
Description of Location of Gain (Loss) on Interest Rate Derivative on Income Statement		Interest income on securities
Gain (Loss) on Fair Value Hedges Recognized in Earnings		$ (25,982,000)	(14,796,000)	0
Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge		25,982,000	14,796,000	$ 0
Notional		$ 477,905,000	$ 477,905,000
[1] The carrying amount as shown represents the designated last-of-layer. At December 31, 2018, the total amortized cost basis of the closed portfolio of loans designated in these hedging relationships was $2.7 billion.

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Fixed interest rate related to the interest rate derivative.

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