Other Comprehensive (Loss) Income (Components of OCI) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Unrealized gains and losses on available for sale debt securities:
Net unrealized (losses) gains arising during the period	$ (20,178)	$ (62,477)	$ 7,641	$ (178,558)
Reclassification adjustment for gains included in net income	0	(58)	0	(58)
Total	(20,178)	(62,535)	7,641	(178,616)
Unrealized gains and losses on derivatives (cash flow hedges):
Net unrealized gains (losses) arising during the period	5,002	3,110	4,219	16,703
Reclassification adjustment for (gains) losses included in net income	(4,124)	(162)	(8,343)	504
Total	878	2,948	(4,124)	17,207
Amortization related to post-retirement obligations	(358)	(322)	(727)	(700)
Total other comprehensive (loss) income	(19,658)	(59,909)	2,790	(162,109)
Unrealized gains and losses on available for sale debt securities:
Net unrealized (losses) gains arising during the period	5,452	16,744	(1,503)	47,854
Reclassification adjustment for gains included in net income	0	16	0	16
Total	5,452	16,760	(1,503)	47,870
Unrealized gains and losses on derivatives (cash flow hedges):
Net unrealized gains (losses) arising during the period	(1,352)	(834)	(1,186)	(4,476)
Reclassification adjustment for (gains) losses included in net income	1,114	44	2,254	(135)
Total	(238)	(790)	1,068	(4,611)
Amortization related to post-retirement obligations	97	86	197	188
Total other comprehensive income (loss)	5,311	16,056	(238)	43,447
Unrealized gains and losses on available for sale debt securities:
Net unrealized gains (losses) arising during the period	(14,726)	(45,733)	6,138	(130,704)
Reclassification adjustment for gains included in net income	0	(42)	0	(42)
Total	(14,726)	(45,775)	6,138	(130,746)
Unrealized gains and losses on derivatives (cash flow hedges):
Net unrealized gains (losses) arising during the period	3,650	2,276	3,033	12,227
Reclassification adjustment for (gains) losses included in net income	(3,010)	(118)	(6,089)	369
Total	640	2,158	(3,056)	12,596
Amortization related to post-retirement obligations	(261)	(236)	(530)	(512)
Total other comprehensive income (loss)	$ (14,347)	$ (43,853)	$ 2,552	$ (118,662)

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