Investment Securities Gross Unrealized Losses and Fair Values of Investments by Category and Length of Time in a Continuous Unrealized Loss Position (Details)	Jun. 30, 2019 USD ($) Security	Dec. 31, 2018 USD ($) Security
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 34,694,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (195,000)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions \| Security	297
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 560,423,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	(12,448,000)
Debt Securities, Available-for-sale, Unrealized Loss Position	595,117,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ (12,643,000)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions \| Security	7
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value		$ 20,601,000
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		(93,000)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value		0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		0
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value		20,601,000
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss		$ (93,000)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions \| Security		6
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions \| Security		0
U.S. Government-Sponsored Agency Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions \| Security		1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions		1
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		$ 4,961,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		(31,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		5,770,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		(108,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		10,731,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		$ (139,000)
State and Municipal Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 15,714,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (44,000)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions \| Security	4	38
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 17,403,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	(41,000)
Debt Securities, Available-for-sale, Unrealized Loss Position	33,117,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ (85,000)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	3	33
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		$ 72,950,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		(1,292,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		83,770,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		(4,174,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		156,720,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		(5,466,000)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value		20,601,000
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		(93,000)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value		0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		0
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value		20,601,000
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss		$ (93,000)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions \| Security		6
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions \| Security		0
Corporate Debt Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 7,054,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (8,000)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions \| Security	14	14
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 25,988,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	(2,313,000)
Debt Securities, Available-for-sale, Unrealized Loss Position	33,042,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ (2,321,000)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	3	8
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		$ 24,419,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		(227,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		25,642,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		(3,126,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		50,061,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		$ (3,353,000)
Collateralized Mortgage Obligations [Member]
Schedule of Investments [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, Number of Positions \| Security	39	89
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 110,517,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	(2,126,000)
Debt Securities, Available-for-sale, Unrealized Loss Position	110,517,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ (2,126,000)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	0	39
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		$ 136,563,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		(1,050,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		388,173,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		(10,922,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		524,736,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		$ (11,972,000)
Residential Mortgage Backed Securities [Member]
Schedule of Investments [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, Number of Positions \| Security	61	110
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 285,675,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	(3,914,000)
Debt Securities, Available-for-sale, Unrealized Loss Position	285,675,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ (3,914,000)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	0	17
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		$ 18,220,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		(222,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		402,779,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		(14,990,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		420,999,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		$ (15,212,000)
Commercial Mortgage Backed Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 11,926,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (143,000)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions \| Security	2	25
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 17,475,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	(9,000)
Debt Securities, Available-for-sale, Unrealized Loss Position	29,401,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ (152,000)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	1	1
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		$ 9,778,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		(35,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		197,326,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		(3,038,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		207,104,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		$ (3,073,000)
Auction Rate Securities [Member]
Schedule of Investments [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, Number of Positions \| Security	177	177
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 103,365,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	(4,045,000)
Debt Securities, Available-for-sale, Unrealized Loss Position	103,365,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ (4,045,000)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		$ 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		102,994,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		(4,416,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		102,994,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		$ (4,416,000)
Debt Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions \| Security		454
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions		99
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		$ 266,891,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		(2,857,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		1,206,454,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		(40,774,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		1,473,345,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		$ (43,631,000)

Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions

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