Supplemental Comprehensive Income Disclosures Supplemental Comprehensive Income Disclosures (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income [Line Items]
Balance at beginning of period	$ 5,579	$ (11,341)	$ (6,173)
Cumulative Effect of New Accounting Principle in Period of Adoption	11,199			$ (1,344)
Other comprehensive income before reclassification adjustment	12,256	17,033	2,456
Amounts reclassified from accumulated other comprehensive income (loss)	(55)	(17)	(6,394)
Net gain		(96)	114
Net other comprehensive income during the period	11,654	16,920	(3,824)
Balance at end of period	17,233	5,579	(11,341)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, after Tax	(424)	0	0
Net gain	(123)	(96)	114
Securities Available for Sale
Accumulated Other Comprehensive Income [Line Items]
Balance at beginning of period		(11,697)	(6,166)
Cumulative Effect of New Accounting Principle in Period of Adoption				(1,328)
Other comprehensive income before reclassification adjustment	15,785	16,294	2,198
Amounts reclassified from accumulated other comprehensive income (loss)	(55)	(17)	(6,401)
Net other comprehensive income during the period	15,730	16,277	(4,203)
Balance at end of period	20,310		(11,697)
AOCI, Derivative Qualifying as Hedge, Excluded Component, Parent [Member]
Accumulated Other Comprehensive Income [Line Items]
Balance at beginning of period		(105)	(306)
Cumulative Effect of New Accounting Principle in Period of Adoption				(64)
Other comprehensive income before reclassification adjustment	(3,529)	739	258
Amounts reclassified from accumulated other comprehensive income (loss)	0	0	7
Net other comprehensive income during the period	(3,529)	739	265
Balance at end of period	(2,895)		(105)
Post-Retirement Obligation
Accumulated Other Comprehensive Income [Line Items]
Balance at beginning of period		461	299
Cumulative Effect of New Accounting Principle in Period of Adoption				48
Net gain		(96)	114
Net other comprehensive income during the period	(547)	(96)	114
Balance at end of period	(182)		461
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, after Tax	424
Net gain	(123)
Accumulated Other Comprehensive Income (Loss), net [Member]
Accumulated Other Comprehensive Income [Line Items]
Net other comprehensive income during the period	11,654	16,920	(3,824)
Previously Reported [Member]
Accumulated Other Comprehensive Income [Line Items]
Balance at beginning of period	5,579
Balance at end of period		5,579
Previously Reported [Member] | Securities Available for Sale
Accumulated Other Comprehensive Income [Line Items]
Balance at beginning of period	4,580
Balance at end of period		4,580
Previously Reported [Member] | AOCI, Derivative Qualifying as Hedge, Excluded Component, Parent [Member]
Accumulated Other Comprehensive Income [Line Items]
Balance at beginning of period	634
Balance at end of period		634
Previously Reported [Member] | Post-Retirement Obligation
Accumulated Other Comprehensive Income [Line Items]
Balance at beginning of period	$ 365
Balance at end of period		$ 365
Accounting Standards Update 2018-02 [Member]
Accumulated Other Comprehensive Income [Line Items]
Balance at beginning of period			(7,517)
Cumulative Effect of New Accounting Principle in Period of Adoption				0
Accounting Standards Update 2018-02 [Member] | Securities Available for Sale
Accumulated Other Comprehensive Income [Line Items]
Balance at beginning of period			(7,494)
Accounting Standards Update 2018-02 [Member] | AOCI, Derivative Qualifying as Hedge, Excluded Component, Parent [Member]
Accumulated Other Comprehensive Income [Line Items]
Balance at beginning of period			(370)
Accounting Standards Update 2018-02 [Member] | Post-Retirement Obligation
Accumulated Other Comprehensive Income [Line Items]
Balance at beginning of period			$ 347
Accounting Standards Update 2018-02 [Member] | Accumulated Other Comprehensive Income (Loss), net [Member]
Accumulated Other Comprehensive Income [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption				$ (1,344)