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Investment Securities - Temporarily Impaired Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018
Debt Securities, Available-for-sale [Line Items]
Fair Value (Estimated) (Less than 12 months)	$ 5,148	$ 152,859	$ 280,229
Unrealized Losses (Less than 12 months)	(9)	(2,845)	(7,761)
Fair Value (Estimated) (12 months or more)	79,595	240,871	132,575
Unrealized Losses (12 months or more)	(1,277)	(10,271)	(6,993)
Fair Value (Estimated)	84,743	393,730	412,804
Unrealized Losses	(1,286)	(13,116)	(14,754)
U.S. Government-sponsored agencies
Debt Securities, Available-for-sale [Line Items]
Fair Value (Estimated) (Less than 12 months)		0	6,882
Unrealized Losses (Less than 12 months)		0	(373)
Fair Value (Estimated) (12 months or more)		10,683	3,689
Unrealized Losses (12 months or more)		(472)	(211)
Fair Value (Estimated)		10,683	10,571
Unrealized Losses		(472)	(584)
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Fair Value (Estimated) (Less than 12 months)	4,150	76,050	202,673
Unrealized Losses (Less than 12 months)	0	(1,061)	(5,660)
Fair Value (Estimated) (12 months or more)	49,270	185,136	91,977
Unrealized Losses (12 months or more)	(790)	(5,926)	(3,757)
Fair Value (Estimated)	53,420	261,186	294,650
Unrealized Losses	(790)	(6,987)	(9,417)
State and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Fair Value (Estimated) (Less than 12 months)	998	76,809	70,674
Unrealized Losses (Less than 12 months)	(9)	(1,784)	(1,728)
Fair Value (Estimated) (12 months or more)	30,325	45,052	36,909
Unrealized Losses (12 months or more)	(487)	(3,873)	(3,025)
Fair Value (Estimated)	31,323	121,861	107,583
Unrealized Losses	$ (496)	$ (5,657)	$ (4,753)

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