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Other Comprehensive Income (Components of OCI) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Unrealized gains and losses on available for sale debt securities:
Net unrealized (losses) gains arising during the period	$ (578)	$ 3,594	$ 20,733	$ 27,291
Reclassification adjustment for gains included in net income	0	0	0	0
Total	(578)	3,594	20,733	27,291
Unrealized losses on derivatives (cash flow hedges)	1,186	188	(8,242)	(1,119)
Amortization related to post-retirement obligations	115	48	322	78
Total other comprehensive income	723	3,830	12,813	26,250
Unrealized gains and losses on available for sale debt securities:
Net unrealized (losses) gains arising during the period	150	(980)	(5,345)	(7,437)
Reclassification adjustment for gains included in net income	0	0	0	0
Total	150	(980)	(5,345)	(7,437)
Unrealized losses on derivatives (cash flow hedges)	(306)	(51)	2,125	306
Amortization related to post-retirement obligations	(30)	(13)	(83)	(21)
Total other comprehensive income	(186)	(1,044)	(3,303)	(7,152)
Unrealized gains and losses on available for sale debt securities:
Net unrealized (losses) gains arising during the period	(428)	2,614	15,388	19,854
Reclassification adjustment for gains included in net income	0	0	0	0
Total	(428)	2,614	15,388	19,854
Unrealized gains on derivatives (cash flow hedges)	880	137	(6,117)	(813)
Amortization related to post-retirement obligations	85	35	239	57
Total other comprehensive income	$ 537	$ 2,786	$ 9,510	$ 19,098

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Amount, before adjustment, of tax expense (benefit) for unrealized holding gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Excludes tax expense (benefit) for unrealized gain (loss) on investment in debt security measured at amortized cost (held-to-maturity) from transfer to available-for-sale.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e640-108580

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669646-108580

+ Details

Name:	us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration