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Investment Securities - Securities Temporarily Impaired (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020
Debt Securities, Available-for-sale [Line Items]
Fair Value (Estimated) (Less than 12 months)	$ 298,520	$ 99,070	$ 115,834
Unrealized Losses (Less than 12 months)	(6,986)	(1,062)	(1,243)
Fair Value (Estimated) (12 months or more)	33,511	3,878	4,216
Unrealized Losses (12 months or more)	(1,469)	(88)	(114)
Fair Value (Estimated)	332,031	102,948	120,050
Unrealized Losses	(8,455)	(1,150)	(1,357)
U.S. Government-sponsored agencies
Debt Securities, Available-for-sale [Line Items]
Fair Value (Estimated) (Less than 12 months)	37,054	30,212	16,817
Unrealized Losses (Less than 12 months)	(1,396)	(333)	(228)
Fair Value (Estimated) (12 months or more)	16,174	0	0
Unrealized Losses (12 months or more)	(871)	0	0
Fair Value (Estimated)	53,228	30,212	16,817
Unrealized Losses	(2,267)	(333)	(228)
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Fair Value (Estimated) (Less than 12 months)	207,951	65,505	79,816
Unrealized Losses (Less than 12 months)	(4,207)	(724)	(654)
Fair Value (Estimated) (12 months or more)	17,337	3,878	4,216
Unrealized Losses (12 months or more)	(598)	(88)	(114)
Fair Value (Estimated)	225,288	69,383	84,032
Unrealized Losses	(4,805)	(812)	(768)
State and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Fair Value (Estimated) (Less than 12 months)	50,050	855	19,201
Unrealized Losses (Less than 12 months)	(1,348)	(3)	(361)
Fair Value (Estimated) (12 months or more)	0	0	0
Unrealized Losses (12 months or more)	0	0	0
Fair Value (Estimated)	50,050	855	19,201
Unrealized Losses	(1,348)	(3)	$ (361)
Corporate securities
Debt Securities, Available-for-sale [Line Items]
Fair Value (Estimated) (Less than 12 months)	3,465	2,498
Unrealized Losses (Less than 12 months)	(35)	(2)
Fair Value (Estimated) (12 months or more)	0	0
Unrealized Losses (12 months or more)	0	0
Fair Value (Estimated)	3,465	2,498
Unrealized Losses	$ (35)	$ (2)

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