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Investment Securities - Securities Temporarily Impaired (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 152,859
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(2,845)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	240,871
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(10,271)
Debt Securities, Available-for-sale, Unrealized Loss Position	393,730
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(13,116)
Less than 12 months, Fair Value		$ 148,611
Less than 12 months, Unrealized Losses		(2,100)
12 months or more, Fair Value		144,394
12 months or more, Unrealized Losses		(3,843)
Fair Value		293,005
Unrealized Losses		(5,943)
U.S. Government-sponsored agencies
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	10,683
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(472)
Debt Securities, Available-for-sale, Unrealized Loss Position	10,683
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(472)
Less than 12 months, Fair Value		7,161
Less than 12 months, Unrealized Losses		(94)
12 months or more, Fair Value		3,814
12 months or more, Unrealized Losses		(86)
Fair Value		10,975
Unrealized Losses		(180)
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	76,050
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(1,061)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	185,136
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(5,926)
Debt Securities, Available-for-sale, Unrealized Loss Position	261,186
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(6,987)
Less than 12 months, Fair Value		132,025
Less than 12 months, Unrealized Losses		(1,857)
12 months or more, Fair Value		101,707
12 months or more, Unrealized Losses		(2,693)
Fair Value		233,732
Unrealized Losses		(4,550)
State and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	76,809
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(1,784)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	45,052
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(3,873)
Debt Securities, Available-for-sale, Unrealized Loss Position	121,861
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ (5,657)
Less than 12 months, Fair Value		9,425
Less than 12 months, Unrealized Losses		(149)
12 months or more, Fair Value		38,864
12 months or more, Unrealized Losses		(1,061)
Fair Value		48,289
Unrealized Losses		(1,210)
Other equity securities
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Fair Value		0
Less than 12 months, Unrealized Losses		0
12 months or more, Fair Value		9
12 months or more, Unrealized Losses		(3)
Fair Value		9
Unrealized Losses		$ (3)

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