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Investment Securities - Securities Temporarily Impaired (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Fair Value (Estimated) (Less than 12 months)	$ 264,229	$ 99,070	$ 22,519
Unrealized Losses (Less than 12 months)	(9,830)	(1,062)	(372)
Fair Value (Estimated) (12 months or more)	3,744	3,878	7,424
Unrealized Losses (12 months or more)	(130)	(88)	(169)
Fair Value (Estimated)	267,973	102,948	29,943
Unrealized Losses	(9,960)	(1,150)	(541)
U.S. Government-sponsored agencies
Debt Securities, Available-for-sale [Line Items]
Fair Value (Estimated) (Less than 12 months)	51,894	30,212
Unrealized Losses (Less than 12 months)	(3,601)	(333)
Fair Value (Estimated) (12 months or more)	0	0
Unrealized Losses (12 months or more)	0	0
Fair Value (Estimated)	51,894	30,212
Unrealized Losses	(3,601)	(333)
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Fair Value (Estimated) (Less than 12 months)	180,138	65,505	2,963
Unrealized Losses (Less than 12 months)	(5,335)	(724)	(27)
Fair Value (Estimated) (12 months or more)	3,744	3,878	7,424
Unrealized Losses (12 months or more)	(130)	(88)	(169)
Fair Value (Estimated)	183,882	69,383	10,387
Unrealized Losses	(5,465)	(812)	(196)
State and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Fair Value (Estimated) (Less than 12 months)	28,783	855	19,556
Unrealized Losses (Less than 12 months)	(808)	(3)	(345)
Fair Value (Estimated) (12 months or more)	0	0	0
Unrealized Losses (12 months or more)	0	0	0
Fair Value (Estimated)	28,783	855	19,556
Unrealized Losses	(808)	(3)	$ (345)
Corporate securities
Debt Securities, Available-for-sale [Line Items]
Fair Value (Estimated) (Less than 12 months)	3,414	2,498
Unrealized Losses (Less than 12 months)	(86)	(2)
Fair Value (Estimated) (12 months or more)	0	0
Unrealized Losses (12 months or more)	0	0
Fair Value (Estimated)	3,414	2,498
Unrealized Losses	$ (86)	$ (2)

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