Accumulated Other Comprehensive Income (Loss) - Changes in components of AOCI (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Accumulated Other Comprehensive Income (Loss)
Balance at the beginning of the period			$ 47,589
Net comprehensive income (loss)	$ 25,167	$ 2,974	(23,453)	$ 11,722
Balance at the end of the period	24,136		24,136
Benefit Plans
Accumulated Other Comprehensive Income (Loss)
Balance at the beginning of the period	(151)	(149)	(151)	(149)
Balance at the end of the period	(151)	(149)	(151)	(149)
Gains and Losses on Available for Sale Securities
Accumulated Other Comprehensive Income (Loss)
Balance at the beginning of the period	(880)	43,473	47,740	11,922
Other comprehensive income (loss) before reclassifications	25,194	4,842	(23,426)	36,393
Amounts reclassified from accumulated other comprehensive income	(27)		(27)
Net comprehensive income (loss)	25,167	4,842	(23,453)	36,393
Balance at the end of the period	24,287	48,315	24,287	48,315
Gains and Losses on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss)
Balance at the beginning of the period		(33,559)		(10,756)
Other comprehensive income (loss) before reclassifications		(3,400)		(26,766)
Amounts reclassified from accumulated other comprehensive income		1,532		2,095
Net comprehensive income (loss)		(1,868)		(24,671)
Balance at the end of the period		(35,427)		(35,427)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss)
Balance at the beginning of the period	(1,031)	9,765	47,589	1,017
Other comprehensive income (loss) before reclassifications	25,194	1,442	(23,426)	9,627
Amounts reclassified from accumulated other comprehensive income	(27)	1,532	(27)	2,095
Net comprehensive income (loss)	25,167	2,974	(23,453)	11,722
Balance at the end of the period	$ 24,136	$ 12,739	$ 24,136	$ 12,739

- 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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