Accumulated Other Comprehensive Income (Loss) - Changes in components of AOCI (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Accumulated Other Comprehensive Income (Loss)
Balance at the beginning of the period	$ 47,589
Other comprehensive (loss) income, net of tax	(48,620)	$ 8,748
Balance at the end of the period	(1,031)
Benefit Plans
Accumulated Other Comprehensive Income (Loss)
Balance at the beginning of the period	(151)	(149)
Balance at the end of the period	(151)	(149)
Unrealized Gains and Losses on Securities Available for Sale
Accumulated Other Comprehensive Income (Loss)
Balance at the beginning of the period	47,740	11,922
Other comprehensive income (loss) before reclassifications	(48,620)	31,551
Other comprehensive (loss) income, net of tax	(48,620)	31,551
Balance at the end of the period	(880)	43,473
Gains and Losses on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss)
Balance at the beginning of the period		(10,756)
Other comprehensive income (loss) before reclassifications		(22,240)
Amounts reclassified from accumulated other comprehensive income		(563)
Other comprehensive (loss) income, net of tax		(22,803)
Balance at the end of the period		(33,559)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss)
Balance at the beginning of the period	47,589	1,017
Other comprehensive income (loss) before reclassifications	(48,620)	9,311
Amounts reclassified from accumulated other comprehensive income		(563)
Other comprehensive (loss) income, net of tax	(48,620)	8,748
Balance at the end of the period	$ (1,031)	$ 9,765

- Definition

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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