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Accumulated Other Comprehensive Income (Loss) - Change in AOCI Components Net of Tax (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at Beginning of Period	$ 1,360,221	$ 1,374,507	$ 1,327,929	$ 1,286,832	$ 1,374,507	$ 1,286,832
Total Other Comprehensive Income (Loss)	319	(49,609)	8,104	41,933	(49,290)	50,037
Balance at End of Period	1,583,531	1,360,221	1,352,082	1,327,929	1,583,531	1,352,082
Unrealized Gains and Losses on Net Investment Securities | Available-for-sale Securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at Beginning of Period	1,352	51,495	49,870	8,359	51,495	8,359
Other Comprehensive Income (Loss) Before Reclassifications	2,281		7,641		(47,862)	49,208
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(2,683)		0		(2,683)	(56)
Total Other Comprehensive Income (Loss)	(402)		7,641		(50,545)	49,152
Balance at End of Period	950	1,352	57,511	49,870	950	57,511
Unrealized Gains and Losses on Net Investment Securities | Held-to-maturity Securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at Beginning of Period	(330)	(423)	(667)	(715)	(423)	(715)
Other Comprehensive Income (Loss) Before Reclassifications	0		0		0	0
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	279		89		372	137
Total Other Comprehensive Income (Loss)	279		89		372	137
Balance at End of Period	(51)	(330)	(578)	(667)	(51)	(578)
Defined Benefit Plans
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at Beginning of Period	(42,809)	(43,250)	(38,382)	(38,756)	(43,250)	(38,756)
Other Comprehensive Income (Loss) Before Reclassifications	0		0		0	0
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	442		374		883	748
Total Other Comprehensive Income (Loss)	442		374		883	748
Balance at End of Period	(42,367)	(42,809)	(38,008)	(38,382)	(42,367)	(38,008)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at Beginning of Period	(41,787)	7,822	10,821	(31,112)	7,822	(31,112)
Other Comprehensive Income (Loss) Before Reclassifications	2,281		7,641		(47,862)	49,208
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(1,962)		463		(1,428)	829
Total Other Comprehensive Income (Loss)	319	(49,609)	8,104	41,933	(49,290)	50,037
Balance at End of Period	$ (41,468)	$ (41,787)	$ 18,925	$ 10,821	$ (41,468)	$ 18,925

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