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Investment Securities - Temporarily Impaired Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Fair Value (Estimated) (Less than 12 months)	$ 22,519	$ 77,148	$ 28,783
Unrealized Losses (Less than 12 months)	(372)	(588)	(147)
Fair Value (Estimated) (12 months or more)	7,424	19,000	267,315
Unrealized Losses (12 months or more)	(169)	(498)	(5,448)
Fair Value (Estimated)	29,943	96,148	296,098
Unrealized Losses	(541)	(1,086)	(5,595)
U.S. Government-sponsored agencies
Debt Securities, Available-for-sale [Line Items]
Fair Value (Estimated) (Less than 12 months)		12,372	0
Unrealized Losses (Less than 12 months)		(128)	0
Fair Value (Estimated) (12 months or more)		0	10,875
Unrealized Losses (12 months or more)		0	(280)
Fair Value (Estimated)		12,372	10,875
Unrealized Losses		(128)	(280)
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Fair Value (Estimated) (Less than 12 months)	2,963	54,244	24,525
Unrealized Losses (Less than 12 months)	(27)	(359)	(138)
Fair Value (Estimated) (12 months or more)	7,424	18,696	198,272
Unrealized Losses (12 months or more)	(169)	(490)	(3,248)
Fair Value (Estimated)	10,387	72,940	222,797
Unrealized Losses	(196)	(849)	(3,386)
State and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Fair Value (Estimated) (Less than 12 months)	19,556	10,532	1,264
Unrealized Losses (Less than 12 months)	(345)	(101)	(3)
Fair Value (Estimated) (12 months or more)	0	304	58,168
Unrealized Losses (12 months or more)	0	(8)	(1,920)
Fair Value (Estimated)	19,556	10,836	59,432
Unrealized Losses	$ (345)	$ (109)	(1,923)
Corporate securities
Debt Securities, Available-for-sale [Line Items]
Fair Value (Estimated) (Less than 12 months)			2,994
Unrealized Losses (Less than 12 months)			(6)
Fair Value (Estimated) (12 months or more)			0
Unrealized Losses (12 months or more)			0
Fair Value (Estimated)			2,994
Unrealized Losses			$ (6)

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