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Derivative Financial Instruments (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2021 | Dec. 31, 2019
Securities Sold under Agreements to Repurchase [Abstract] |  |  |
Gross Amounts Recognized | $ 173,061 |  | $ 230,886
Gross Amounts Offset in the Statement of Financial Position | 0 |  | 0
Net Amounts of Liabilities presented in the Statement of Financial Position | 173,061 |  | 230,886
Financial Instruments | 0 |  | 0
Fair Value Collateral Posted | 173,061 |  | 230,886
Net Amount | 0 |  | 0
Fair value of derivatives in a net liability position | 43,300 |  |
Posted collateral | 43,300 |  |
Interest rate swap |  |  |
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract] |  |  |
Asset derivatives (other assets), fair value | 33,697 |  | 11,055
Liability derivatives (other liabilities), fair value | 43,319 |  | 14,747
Derivative Asset [Abstract] |  |  |
Gross Amounts Offset in the Statement of Financial Position | 0 |  | 0
Derivative financial instruments | 33,697 |  | 11,055
Financial Instruments | 13 |  | 56
Fair Value Collateral Posted | 0 |  | 0
Net Amount | 33,683 |  | 10,999
Derivative Liability [Abstract] |  |  |
Gross Amounts Offset in the Statement of Financial Position | 0 |  | 0
Net Amounts of Liabilities presented in the Statement of Financial Position | 43,319 |  | 14,747
Financial Instruments | 13 |  | 56
Fair Value Collateral Posted | 42,746 |  | 14,573
Net Amount | 560 |  | 118
Derivatives Designated as Hedging Instruments |  |  |
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract] |  |  |
Asset derivatives (other assets), fair value | 0 |  | 0
Liability derivatives (other liabilities), fair value | 9,587 |  | 2,872
Derivatives Designated as Hedging Instruments | Other Assets | Interest rate swap |  |  |
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract] |  |  |
Derivative Asset, Notional Amount | 261,962 |  | 61,962
Asset derivatives (other assets), fair value | 0 |  | 0
Derivatives Designated as Hedging Instruments | Other Liabilities | Interest rate swap |  |  |
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract] |  |  |
Liability derivatives (other liabilities), fair value | 9,587 |  | 2,872
Derivatives not Designated as Hedging Instruments |  |  |
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract] |  |  |
Asset derivatives (other assets), fair value | 33,697 |  | 11,055
Liability derivatives (other liabilities), fair value | 33,732 |  | 11,875
Derivatives not Designated as Hedging Instruments | Other Assets | Interest rate swap |  |  |
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract] |  |  |
Derivative Asset, Notional Amount | 842,899 |  | 749,819
Asset derivatives (other assets), fair value | 33,697 |  | 11,055
Derivatives not Designated as Hedging Instruments | Other Liabilities | Interest rate swap |  |  |
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract] |  |  |
Liability derivatives (other liabilities), fair value | $ 33,732 |  | $ 11,875
Cash Flow Hedging | Subordinated Debt [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative, Variable Interest Rate | 2.62% |  |
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract] |  |  |
Derivative Asset, Notional Amount | $ 62,000 |  |
Cash Flow Hedging | Federal Home Loan Bank Overnight Advances [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative, fixed rate | 1.12% |  |
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract] |  |  |
Derivative Asset, Notional Amount | $ 100,000 |  |
Cash Flow Hedging | Federal Home Loan Bank 3 Month Advances [Member] |  |  |
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract] |  |  |
Derivative Asset, Notional Amount | $ 100,000 |  |
Maximum | Cash Flow Hedging | Subordinated Debt [Member] |  |  |
Derivative [Line Items] |  |  |
Cash flow hedge term | 6 years |  |
Maximum | Cash Flow Hedging | Federal Home Loan Bank Overnight Advances [Member] |  |  |
Derivative [Line Items] |  |  |
Cash flow hedge term | 3 years |  |
Maximum | Cash Flow Hedging | Federal Home Loan Bank 3 Month Advances [Member] |  |  |
Derivative [Line Items] |  |  |
Cash flow hedge term | 5 years |  |
Scenario, Forecast | Cash Flow Hedging |  |  |
Derivative [Line Items] |  |  |
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income |  | $ 2,200 |

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