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Derivative Financial Instruments (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024 USD ($) derivative	Jun. 30, 2023 USD ($) derivative	Jun. 30, 2024 USD ($) derivative	Jun. 30, 2023 USD ($) derivative	Dec. 31, 2023 USD ($)
Notional amount, Assets	$ 2,068,017		$ 2,068,017		$ 1,619,026
Short term advances and brokered CD's	775,800		775,800		826,800
Customer [Member]
Derivative instruments					360,500
Bank [Member]
Derivative instruments	393,200		393,200		360,500
Customer and Bank [Member]
Derivative instruments	786,300		786,300		721,000
Cash Flow Hedging [Member]
Amount reclassified from accumulated other comprehensive loss to interest expense	$ 6,400	$ 6,900	13,300	$ 11,200
Amount to be reclassified from the accumulated comprehensive income (loss) into earnings			$ 19,800
Number of derivative contracts terminated	0	0	7	0
Net gain			$ 1,700
Income recognized	$ 200	$ 1,100	1,000	$ 2,500
Gain (loss) on termination of swaps			1,700
Not Designated as Hedging Instrument [Member]
Notional amount, Assets	786,300		786,300		722,000
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]
Notional amount, Assets	775,800		775,800		825,800
Designated as Hedging Instrument [Member] | Fair Value Hedging [Member]
Amount of hedged item	899,100		899,100		902,500
Interest Rate Swap [Member]
Notional amount, Assets	899,100		899,100		902,500
Interest Rate Swap [Member] | Customer [Member]
Derivative instruments	393,200		393,200
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member]
Notional amount, Assets	393,169		393,169		361,486
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]
Notional amount, Assets	775,750		775,750		555,000
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Fair Value Hedging [Member]
Notional amount, Assets	899,098		899,098		702,540
Portfolio Layer Hedges on Closed Portfolio of Securities Available for Sale [Member] | Designated as Hedging Instrument [Member]
Notional amount, Assets	264,878		264,878		283,195
Notional amount	200,000		200,000		200,000
Portfolio Layer Hedges on Closed Portfolio of Loans [Member] | Designated as Hedging Instrument [Member]
Notional amount, Assets	2,505,187		2,505,187		2,590,087
Notional amount	$ 500,000		$ 500,000		$ 500,000

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- Definition

The amount of gain loss on termination of swaps.

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Amount of gain (loss) from amortization of derivatives income.

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The number of derivative contracts terminated during the period.

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The amount of short term advances and brokered certificate of deposit.

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Amount of hedged item in hedging relationship. Excludes hedged asset or liability.

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Nominal or face amount used to calculate payments on the derivative asset.

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The estimated value of gains (losses), net anticipated to be transferred in the future from accumulated other comprehensive income into earnings.

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Nominal or face amount used to calculate payment on derivative.

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Fair value as of the balance sheet date of interest rate derivative assets, net of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized on the balance sheet.

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Amount before tax of reclassification adjustments of other comprehensive income (loss).

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