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Financial Derivative Instruments (Details) | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2020 USD ($) derivative | Dec. 31, 2019 USD ($) derivative | Sep. 30, 2019 USD ($) derivative
Interest Rate Swap |  |  |
Derivative [Line Items] |  |  |
Expense incurred from restructuring derivatives | $ 1,760,000 |  |
Not Designated as Hedging Instrument | Customer loan interest swap agreements |  |  |
Derivative [Line Items] |  |  |
Fair Value | $ 0 | $ 0 | $ 0
Number of derivative instruments | derivative | 8 | 4 | 2
Derivative notional amount | $ 57,082,000 | $ 32,748,000 | $ 25,828,000
Collateral posted, cash | 3,100,000 |  |
Collateral posted, securities | 10,000,000 |  |
Not Designated as Hedging Instrument | Customer Loan Swaps |  |  |
Derivative [Line Items] |  |  |
Required amount to be pledged | 9,322,000 |  |
Other Liabilities | Not Designated as Hedging Instrument | Customer loan interest swap agreements |  |  |
Derivative [Line Items] |  |  |
Fair Value | $ (3,311,000) | $ (1,205,000) | $ (1,643,000)
Number of derivative instruments | derivative | 4 | 2 | 1
Derivative notional amount | $ 28,541,000 | $ 16,374,000 | $ 12,914,000
Other Assets | Not Designated as Hedging Instrument | Customer loan interest swap agreements |  |  |
Derivative [Line Items] |  |  |
Fair Value | $ 3,311,000 | $ 1,205,000 | $ 1,643,000
Number of derivative instruments | derivative | 4 | 2 | 1
Derivative notional amount | $ 28,541,000 | $ 16,374,000 | $ 12,914,000
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap December 5 2019 |  |  |
Derivative [Line Items] |  |  |
Fixed Rate Paid | 2.466% |  |
Notional Amount | $ 0 | 0 | 25,000,000
Fair Value | $ 0 | 0 | (23,000)
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap June 27 2021 |  |  |
Derivative [Line Items] |  |  |
Fixed Rate Paid | 0.893% |  |
Notional Amount | $ 20,000,000 | 20,000,000 | 20,000,000
Fair Value | $ (112,000) | 199,000 | 214,000
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap June 28 2021 |  |  |
Derivative [Line Items] |  |  |
Fixed Rate Paid | 0.94% |  |
Notional Amount | $ 30,000,000 | 30,000,000 | 30,000,000
Fair Value | $ (179,000) | 278,000 | 296,000
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap June 5 2020 |  |  |
Derivative [Line Items] |  |  |
Fixed Rate Paid | 2.547% |  |
Notional Amount | $ 0 | 25,000,000 | 25,000,000
Fair Value | $ 0 | (96,000) | (140,000)
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap December 5 2020 |  |  |
Derivative [Line Items] |  |  |
Fixed Rate Paid | 2.603% |  |
Notional Amount | $ 0 | 25,000,000 | 25,000,000
Fair Value | $ 0 | (234,000) | (300,000)
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap December 5 2022 |  |  |
Derivative [Line Items] |  |  |
Fixed Rate Paid | 1.779% |  |
Notional Amount | $ 0 | 25,000,000 | 25,000,000
Fair Value | $ 0 | (98,000) | (217,000)
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap August 2 2024 |  |  |
Derivative [Line Items] |  |  |
Fixed Rate Paid | 1.59% |  |
Notional Amount | $ 12,500,000 | 12,500,000 | 12,500,000
Fair Value | $ (692,000) | (11,000) | (133,000)
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap August 5 2024 |  |  |
Derivative [Line Items] |  |  |
Fixed Rate Paid | 1.42% |  |
Notional Amount | $ 12,500,000 | 12,500,000 | 12,500,000
Fair Value | $ (611,000) | 85,000 | (32,000)
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap February 12 2023 |  |  |
Derivative [Line Items] |  |  |
Fixed Rate Paid | 1.486% |  |
Notional Amount | $ 25,000,000 | 0 | 0
Fair Value | $ (762,000) | 0 | 0
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap February 12 2024 |  |  |
Derivative [Line Items] |  |  |
Fixed Rate Paid | 1.477% |  |
Notional Amount | $ 25,000,000 | 0 | 0
Fair Value | $ (1,044,000) | 0 | 0
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap June 28 2026 |  |  |
Derivative [Line Items] |  |  |
Fixed Rate Paid | 1.158% |  |
Notional Amount | $ 50,000,000 | 0 | 0
Fair Value | $ (2,162,000) | 0 | 0
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap March 13 2025 |  |  |
Derivative [Line Items] |  |  |
Fixed Rate Paid | 0.855% |  |
Notional Amount | $ 25,000,000 | 0 | 0
Fair Value | $ (621,000) | 0 | 0
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap March 13 2030 |  |  |
Derivative [Line Items] |  |  |
Fixed Rate Paid | 1.029% |  |
Notional Amount | $ 20,000,000 | 0 | 0
Fair Value | $ (690,000) | 0 | 0
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap April 07 2023 |  |  |
Derivative [Line Items] |  |  |
Fixed Rate Paid | 0.599% |  |
Notional Amount | $ 20,000,000 | 0 | 0
Fair Value | $ (194,000) | 0 | 0
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap April 07 2024 |  |  |
Derivative [Line Items] |  |  |
Fixed Rate Paid | 0.643% |  |
Notional Amount | $ 20,000,000 | 0 | 0
Fair Value | (275,000) | 0 | 0
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap |  |  |
Derivative [Line Items] |  |  |
Notional Amount | 260,000,000 | 150,000,000 | 175,000,000
Fair Value | (7,342,000) | $ 123,000 | $ (335,000)
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap Maturity Date Prior to December 31, 2021 |  |  |
Derivative [Line Items] |  |  |
Notional Amount | $ 50,000,000 |  |
Number of derivative instruments | derivative | 2 |  |
Cash Flow Hedging | Designated as Hedging Instrument | Contract With Maturity Dates Beyond December 31, 2021 |  |  |
Derivative [Line Items] |  |  |
Notional Amount | $ 210,000,000 |  |
Number of derivative instruments | derivative | 9 |  |
Cash Flow Hedging | Designated as Hedging Instrument | Contract with Maturity Dates December 19, 2029, July 1, 2035, and October 1, 2039 |  |  |
Derivative [Line Items] |  |  |
Number of derivative instruments | derivative | 4 |  |

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