Securities - Schedule of Unrealized Loss and Fair Value on Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Jan. 01, 2020	Dec. 31, 2019
Fair Value
Less Than 12 Months	$ 174,885		$ 312,988
12 Months or Longer	108,966		214,951
Total	283,851		527,939
Unrealized Losses
Less Than 12 Months	(2,266)		(2,041)
12 Months or Longer	(3,822)		(2,506)
Total	(6,088)		(4,547)
U.S. Treasury securities and obligations of U.S. government agencies
Fair Value
Less Than 12 Months	269		758
12 Months or Longer	0		0
Total	269		758
Unrealized Losses
Less Than 12 Months	(1)		(4)
12 Months or Longer	0		0
Total	(1)		(4)
Mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities
Fair Value
Less Than 12 Months	65,273		220,057
12 Months or Longer	357		104,184
Total	65,630		324,241
Unrealized Losses
Less Than 12 Months	(74)		(1,461)
12 Months or Longer	(16)		(1,923)
Total	(90)		(3,384)
Private mortgage-backed securities and collateralized mortgage obligations
Fair Value
Less Than 12 Months	24,532		2,978
12 Months or Longer	0		0
Total	24,532		2,978
Unrealized Losses
Less Than 12 Months	(550)		(5)
12 Months or Longer	0		0
Total	(550)		(5)
Collateralized loan obligations
Fair Value
Less Than 12 Months	84,299		88,680
12 Months or Longer	108,609		110,767
Total	192,908		199,447
Unrealized Losses
Less Than 12 Months	(1,638)		(570)
12 Months or Longer	(3,806)		(583)
Total	(5,444)	$ (1,200)	(1,153)
Obligations of state and political subdivisions
Fair Value
Less Than 12 Months	512		515
12 Months or Longer	0		0
Total	512		515
Unrealized Losses
Less Than 12 Months	(3)		(1)
12 Months or Longer	0		0
Total	$ (3)		$ (1)