Accumulated Other Comprehensive (Loss) Income - Components of Accumulated Other Comprehensive (Loss) Income, Net of Taxes (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019	Dec. 31, 2018
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Beginning balance		$ (21,730)
Other comprehensive (loss) income		(4,135)	$ 4,095
Ending balance		(25,628)
Net Unrealized Holding (Losses) Gains on Available-for-Sale Investment Securities [Member]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Beginning balance		(3,231)	(11,221)
Other comprehensive (loss) income		(4,000)	4,044
Ending balance		(6,994)	(7,177)
Net Unrealized Holding (Losses) Gains on Available-for-Sale Investment Securities [Member] | Accounting Standards Update 2016-13
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Cumulative effect of new accounting principle in period of adoption	[1]			$ 237
Net Unrealized Holding (Losses) Gains on Available-for-Sale Investment Securities [Member] | Accounting Standards Update 2017-12
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Cumulative effect of new accounting principle in period of adoption					$ 0
Net Change Related to Derivatives Used for Cash Flow Hedge [Member]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Beginning balance		(185)	81
Other comprehensive (loss) income		(370)	(145)
Ending balance		(555)	19
Net Change Related to Derivatives Used for Cash Flow Hedge [Member] | Accounting Standards Update 2016-13
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Cumulative effect of new accounting principle in period of adoption	[1]			0
Net Change Related to Derivatives Used for Cash Flow Hedge [Member] | Accounting Standards Update 2017-12
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Cumulative effect of new accounting principle in period of adoption					83
Net Change Related to Defined Benefit Pension Plan [Member]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Beginning balance		(18,314)	(17,276)
Other comprehensive (loss) income		235	196
Ending balance		(18,079)	(17,080)
Net Change Related to Defined Benefit Pension Plan [Member] | Accounting Standards Update 2016-13
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Cumulative effect of new accounting principle in period of adoption	[1]			0
Net Change Related to Defined Benefit Pension Plan [Member] | Accounting Standards Update 2017-12
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Cumulative effect of new accounting principle in period of adoption					0
Accumulated Other Comprehensive (Loss) Income [Member]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Beginning balance		(21,730)	(28,416)
Other comprehensive (loss) income		(4,135)	4,095
Ending balance		$ (25,628)	$ (24,238)
Accumulated Other Comprehensive (Loss) Income [Member] | Accounting Standards Update 2016-13
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Cumulative effect of new accounting principle in period of adoption	[1]			$ 237
Accumulated Other Comprehensive (Loss) Income [Member] | Accounting Standards Update 2017-12
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Cumulative effect of new accounting principle in period of adoption					$ 83

[1] (1) See Note 1, "Summary of Significant Accounting Policies - Accounting Pronouncements Adopted in 2020" for additional information.