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Derivative Financial Instruments - Narrative (Details) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2020 USD ($) interest_rate_swap instrument | Dec. 31, 2019 USD ($) interest_rate_swap
Derivative [Line Items] |  |
Estimated amount to be transferred from accumulated other comprehensive income to earnings | $ 1,016 |
Termination value of derivatives in a net liability position | 81,962 |
Derivative collateral posted | 75,415 |
Not Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Notional amount of interest rate derivatives | $ 878,640 | $ 692,287
Federal Home Loan Bank Advances |  |
Derivative [Line Items] |  |
Number of debt instruments held | instrument | 1 |
Interest rate contracts | Not Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Increase in derivative assets | $ 54,200 |
Increase in derivative liabilities | 55,000 |
Increase in outstanding notional balance | $ 176,400 |
Cash Flow Hedging | Interest rate swap |  |
Derivative [Line Items] |  |
Number of interest rate derivatives held | interest_rate_swap | 3 | 4
Notional amount of interest rate derivatives | $ 36,000 | $ 46,000
Cash Flow Hedging | Interest rate swap | Trust Preferred Debt |  |
Derivative [Line Items] |  |
Notional amount of interest rate derivatives | 26,000 |
Cash Flow Hedging | Interest rate swap | Federal Home Loan Bank Advances |  |
Derivative [Line Items] |  |
Notional amount of interest rate derivatives | $ 10,000 |

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