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Derivative Instruments and Hedging Activities (Fair Values of Derivative Instruments on the Balance Sheet) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Derivatives, Fair Value [Line Items]
Asset derivatives	$ 16,139	$ 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	1,112
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	863,210	873,566
Derivatives Not Designated as Hedging Instruments [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Asset derivatives	15,027	20,120
Derivatives Not Designated as Hedging Instruments [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Liability derivatives	14,664	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	1,112
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	726,910	631,907
Interest Rate Swap [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Asset derivatives	14,653	19,626
Interest Rate Swap [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Liability derivatives	14,658	19,837
Credit Contract [Member] | Derivatives Not Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Gross notional amount	109,552	113,434
Credit Contract [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Asset derivatives	0	23
Credit Contract [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Liability derivatives	1	86
Mortgage Banking [Member] | Derivatives Not Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Gross notional amount	26,748	28,225
Mortgage Banking [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Asset derivatives	374	471
Mortgage Banking [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Liability derivatives	$ 5	$ 1

X

- Definition

Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

+ References

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X

- Definition

Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

+ References

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- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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