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Investment Securities - Temporarily Impaired Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018
Debt Securities, Available-for-sale [Line Items]
Fair Value (Estimated) (Less than 12 months)	$ 35,322	$ 152,859	$ 267,597
Unrealized Losses (Less than 12 months)	(275)	(2,845)	(7,835)
Fair Value (Estimated) (12 months or more)	22,875	240,871	189,876
Unrealized Losses (12 months or more)	(479)	(10,271)	(12,273)
Fair Value (Estimated)	58,197	393,730	457,473
Unrealized Losses	(754)	(13,116)	(20,108)
U.S. Government-sponsored agencies
Debt Securities, Available-for-sale [Line Items]
Fair Value (Estimated) (Less than 12 months)		0	7,753
Unrealized Losses (Less than 12 months)		0	(247)
Fair Value (Estimated) (12 months or more)		10,683	7,614
Unrealized Losses (12 months or more)		(472)	(541)
Fair Value (Estimated)		10,683	15,367
Unrealized Losses		(472)	(788)
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Fair Value (Estimated) (Less than 12 months)	30,249	76,050	154,611
Unrealized Losses (Less than 12 months)	(233)	(1,061)	(4,333)
Fair Value (Estimated) (12 months or more)	22,569	185,136	143,771
Unrealized Losses (12 months or more)	(473)	(5,926)	(7,427)
Fair Value (Estimated)	52,818	261,186	298,382
Unrealized Losses	(706)	(6,987)	(11,760)
State and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Fair Value (Estimated) (Less than 12 months)	5,073	76,809	105,233
Unrealized Losses (Less than 12 months)	(42)	(1,784)	(3,255)
Fair Value (Estimated) (12 months or more)	306	45,052	38,491
Unrealized Losses (12 months or more)	(6)	(3,873)	(4,305)
Fair Value (Estimated)	5,379	121,861	143,724
Unrealized Losses	$ (48)	$ (5,657)	$ (7,560)

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