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Securities Securities - Unrealized Losses (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Schedule of Investment Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 59,594,000	$ 17,547,000
Investment securities, continuous unrealized loss position [Abstract]
Investments with an Unrealized Loss of less than 12 months, Fair Value	1,347,820,000	1,017,346,000
Investments with an Unrealized Loss of less than 12 months, Unrealized Losses	26,783,000	9,021,000
Investments with an Unrealized Loss of 12 months or longer, Fair Value	1,161,369,000	361,724,000
Investments with an Unrealized Loss of 12 months or longer, Unrealized Losses	32,811,000	8,526,000
Total Investments with an Unrealized Loss, Fair Value	2,509,189,000	1,379,070,000
US Treasury Securities
Schedule of Investment Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	25,000	60,000
Investment securities, continuous unrealized loss position [Abstract]
Investments with an Unrealized Loss of less than 12 months, Fair Value	30,054,000	29,948,000
Investments with an Unrealized Loss of less than 12 months, Unrealized Losses	22,000	60,000
Investments with an Unrealized Loss of 12 months or longer, Fair Value	246,000	0
Investments with an Unrealized Loss of 12 months or longer, Unrealized Losses	3,000	0
Total Investments with an Unrealized Loss, Fair Value	30,300,000	29,948,000
U.S. Government Agency Securities
Schedule of Investment Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	1,346,000	1,766,000
Investment securities, continuous unrealized loss position [Abstract]
Investments with an Unrealized Loss of less than 12 months, Fair Value	13,697,000	173,677,000
Investments with an Unrealized Loss of less than 12 months, Unrealized Losses	328,000	1,766,000
Investments with an Unrealized Loss of 12 months or longer, Fair Value	42,539,000	0
Investments with an Unrealized Loss of 12 months or longer, Unrealized Losses	1,018,000	0
Total Investments with an Unrealized Loss, Fair Value	56,236,000	173,677,000
Mortgage-backed Agency Securities
Schedule of Investment Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	28,634,000	12,124,000
Investment securities, continuous unrealized loss position [Abstract]
Investments with an Unrealized Loss of less than 12 months, Fair Value	203,299,000	607,408,000
Investments with an Unrealized Loss of less than 12 months, Unrealized Losses	2,134,000	5,042,000
Investments with an Unrealized Loss of 12 months or longer, Fair Value	882,231,000	285,561,000
Investments with an Unrealized Loss of 12 months or longer, Unrealized Losses	26,500,000	7,082,000
Total Investments with an Unrealized Loss, Fair Value	1,085,530,000	892,969,000
State and Municipal Securities
Schedule of Investment Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	22,721,000	2,634,000
Investment securities, continuous unrealized loss position [Abstract]
Investments with an Unrealized Loss of less than 12 months, Fair Value	805,821,000	115,403,000
Investments with an Unrealized Loss of less than 12 months, Unrealized Losses	18,643,000	1,408,000
Investments with an Unrealized Loss of 12 months or longer, Fair Value	198,610,000	50,083,000
Investments with an Unrealized Loss of 12 months or longer, Unrealized Losses	4,078,000	1,226,000
Total Investments with an Unrealized Loss, Fair Value	1,004,431,000	165,486,000
Asset-backed Securities
Schedule of Investment Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	4,345,000	316,000
Investment securities, continuous unrealized loss position [Abstract]
Investments with an Unrealized Loss of less than 12 months, Fair Value	268,677,000	68,742,000
Investments with an Unrealized Loss of less than 12 months, Unrealized Losses	4,118,000	198,000
Investments with an Unrealized Loss of 12 months or longer, Fair Value	11,828,000	14,136,000
Investments with an Unrealized Loss of 12 months or longer, Unrealized Losses	227,000	118,000
Total Investments with an Unrealized Loss, Fair Value	280,505,000	82,878,000
Corporate Notes
Schedule of Investment Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	2,523,000	647,000
Investment securities, continuous unrealized loss position [Abstract]
Investments with an Unrealized Loss of less than 12 months, Fair Value	26,272,000	22,168,000
Investments with an Unrealized Loss of less than 12 months, Unrealized Losses	1,538,000	547,000
Investments with an Unrealized Loss of 12 months or longer, Fair Value	25,915,000	11,944,000
Investments with an Unrealized Loss of 12 months or longer, Unrealized Losses	985,000	100,000
Total Investments with an Unrealized Loss, Fair Value	$ 52,187,000	$ 34,112,000

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
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