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Derivative Instruments and Hedging Activities (Fair Values of Derivative Instruments on the Balance Sheet) (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Asset derivatives | $ 18,391 | $ 20,120
Derivatives Designated as Hedging Instruments [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross notional amount | 50,000 | 50,000
Derivatives Designated as Hedging Instruments [Member] | Other Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives | 1,677 |
Derivatives Designated as Hedging Instruments [Member] | Other Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Liability derivatives |  | 311
Derivatives Not Designated as Hedging Instruments [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross notional amount | 849,973 | 873,566
Derivatives Not Designated as Hedging Instruments [Member] | Other Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives | 16,714 | 20,120
Derivatives Not Designated as Hedging Instruments [Member] | Other Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Liability derivatives | 15,619 | 19,924
Cash Flow Hedge of Interest Rate Risk [Member] | Derivatives Designated as Hedging Instruments [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross notional amount | 50,000 | 50,000
Cash Flow Hedge of Interest Rate Risk [Member] | Derivatives Designated as Hedging Instruments [Member] | Other Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives | 1,677 |
Cash Flow Hedge of Interest Rate Risk [Member] | Derivatives Designated as Hedging Instruments [Member] | Other Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Liability derivatives |  | 311
Cash Flow Hedge of Interest Rate Risk [Member] | Derivatives Not Designated as Hedging Instruments [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross notional amount |  | 100,000
Interest Rate Swap [Member] | Derivatives Not Designated as Hedging Instruments [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross notional amount | 706,115 | 631,907
Interest Rate Swap [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Other Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives | 16,176 | 19,626
Interest Rate Swap [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Other Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Liability derivatives | 15,580 | 19,837
Credit Contract [Member] | Derivatives Not Designated as Hedging Instruments [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross notional amount | 115,833 | 113,434
Credit Contract [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Other Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives | 12 | 23
Credit Contract [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Other Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Liability derivatives | 39 | 86
Mortgage Banking [Member] | Derivatives Not Designated as Hedging Instruments [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross notional amount | 28,025 | 28,225
Mortgage Banking [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Other Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives | $ 526 | 471
Mortgage Banking [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Other Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Liability derivatives |  | $ 1

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