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Investment Securities - Temporarily Impaired Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019
Debt Securities, Available-for-sale [Line Items]
Fair Value (Estimated) (Less than 12 months)	$ 115,834	$ 77,148	$ 35,322
Unrealized Losses (Less than 12 months)	(1,243)	(588)	(275)
Fair Value (Estimated) (12 months or more)	4,216	19,000	22,875
Unrealized Losses (12 months or more)	(114)	(498)	(479)
Fair Value (Estimated)	120,050	96,148	58,197
Unrealized Losses	(1,357)	(1,086)	(754)
U.S. Government-sponsored agencies
Debt Securities, Available-for-sale [Line Items]
Fair Value (Estimated) (Less than 12 months)	16,817	12,372
Unrealized Losses (Less than 12 months)	(228)	(128)
Fair Value (Estimated) (12 months or more)	0	0
Unrealized Losses (12 months or more)	0	0
Fair Value (Estimated)	16,817	12,372
Unrealized Losses	(228)	(128)
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Fair Value (Estimated) (Less than 12 months)	79,816	54,244	30,249
Unrealized Losses (Less than 12 months)	(654)	(359)	(233)
Fair Value (Estimated) (12 months or more)	4,216	18,696	22,569
Unrealized Losses (12 months or more)	(114)	(490)	(473)
Fair Value (Estimated)	84,032	72,940	52,818
Unrealized Losses	(768)	(849)	(706)
State and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Fair Value (Estimated) (Less than 12 months)	19,201	10,532	5,073
Unrealized Losses (Less than 12 months)	(361)	(101)	(42)
Fair Value (Estimated) (12 months or more)	0	304	306
Unrealized Losses (12 months or more)	0	(8)	(6)
Fair Value (Estimated)	19,201	10,836	5,379
Unrealized Losses	$ (361)	$ (109)	$ (48)

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