Supplemental Comprehensive Income Disclosures Supplemental Comprehensive Income Disclosures (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption			$ 0
Balance at beginning of period	$ (11,341)	$ (6,173)	(7,027)
Other comprehensive income before reclassification adjustment	17,033	2,456	3,979
Amounts reclassified from accumulated other comprehensive income (loss)	(17)	(6,394)	(3,199)
Net gain	(96)	114	74
Net other comprehensive income during the period	16,920	(3,824)	854
Balance at end of period	5,579	(11,341)	(6,173)
Securities Available for Sale
Accumulated Other Comprehensive Income [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption			(1,328)
Balance at beginning of period		(6,166)	(7,455)
Other comprehensive income before reclassification adjustment	16,294	2,198	4,565
Amounts reclassified from accumulated other comprehensive income (loss)	(17)	(6,401)	(3,276)
Net other comprehensive income during the period	16,277	(4,203)	1,289
Balance at end of period	4,580		(6,166)
AOCI, Derivative Qualifying as Hedge, Excluded Component, Parent [Member]
Accumulated Other Comprehensive Income [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption			(64)
Balance at beginning of period		(306)	203
Other comprehensive income before reclassification adjustment	739	258	(586)
Amounts reclassified from accumulated other comprehensive income (loss)	0	7	77
Net other comprehensive income during the period	739	265	(509)
Balance at end of period	634		(306)
Post-Retirement Obligation
Accumulated Other Comprehensive Income [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption			48
Balance at beginning of period		299	225
Net gain	(96)	114	74
Net other comprehensive income during the period	(96)	114	74
Balance at end of period	365		299
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)
Net other comprehensive income during the period	16,920	(3,824)	854
Previously Reported [Member]
Accumulated Other Comprehensive Income [Line Items]
Balance at beginning of period	(11,341)
Balance at end of period		(11,341)
Previously Reported [Member] | Securities Available for Sale
Accumulated Other Comprehensive Income [Line Items]
Balance at beginning of period	(11,697)
Balance at end of period		(11,697)
Previously Reported [Member] | AOCI, Derivative Qualifying as Hedge, Excluded Component, Parent [Member]
Accumulated Other Comprehensive Income [Line Items]
Balance at beginning of period	(105)
Balance at end of period		(105)
Previously Reported [Member] | Post-Retirement Obligation
Accumulated Other Comprehensive Income [Line Items]
Balance at beginning of period	$ 461
Balance at end of period		461
Accounting Standards Update 2018-02 [Member]
Accumulated Other Comprehensive Income [Line Items]
Balance at beginning of period		(7,517)
Balance at end of period			(7,517)
Accounting Standards Update 2018-02 [Member] | Securities Available for Sale
Accumulated Other Comprehensive Income [Line Items]
Balance at beginning of period		(7,494)
Balance at end 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)
Balance at end of period			(370)
Accounting Standards Update 2018-02 [Member] | Post-Retirement Obligation
Accumulated Other Comprehensive Income [Line Items]
Balance at beginning of period		$ 347
Balance at end of period			$ 347