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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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