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Securities- Unrealized Losses (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Available-for-sale securities, continuous unrealized loss position [Abstract]
Investments with an unrealized loss of less than 12 months, fair value	$ 1,882,672	$ 1,017,346
Investments with an unrealized loss of less than 12 months, unrealized losses	38,834	9,021
Investments with an unrealized loss of 12 months or longer, fair value	438,993	361,724
Investments with an unrealized loss of 12 months or longer, unrealized losses	18,121	8,526
Total investments with an unrealized loss, fair value	2,321,665	1,379,070
Total investments with an unrealized loss, unrealized losses	56,955	17,547
U.S. Treasury securities
Available-for-sale securities, continuous unrealized loss position [Abstract]
Investments with an unrealized loss of less than 12 months, fair value	30,780	29,948
Investments with an unrealized loss of less than 12 months, unrealized losses	26	60
Investments with an unrealized loss of 12 months or longer, fair value	0	0
Investments with an unrealized loss of 12 months or longer, unrealized losses	0	0
Total investments with an unrealized loss, fair value	30,780	29,948
Total investments with an unrealized loss, unrealized losses	26	60
U.S. government agency securities
Available-for-sale securities, continuous unrealized loss position [Abstract]
Investments with an unrealized loss of less than 12 months, fair value	134,322	173,677
Investments with an unrealized loss of less than 12 months, unrealized losses	3,308	1,766
Investments with an unrealized loss of 12 months or longer, fair value	27,480	0
Investments with an unrealized loss of 12 months or longer, unrealized losses	678	0
Total investments with an unrealized loss, fair value	161,802	173,677
Total investments with an unrealized loss, unrealized losses	3,986	1,766
Mortgage-backed securities
Available-for-sale securities, continuous unrealized loss position [Abstract]
Investments with an unrealized loss of less than 12 months, fair value	720,677	607,408
Investments with an unrealized loss of less than 12 months, unrealized losses	19,811	5,042
Investments with an unrealized loss of 12 months or longer, fair value	339,377	285,561
Investments with an unrealized loss of 12 months or longer, unrealized losses	14,331	7,082
Total investments with an unrealized loss, fair value	1,060,054	892,969
Total investments with an unrealized loss, unrealized losses	34,142	12,124
State and municipal securities
Available-for-sale securities, continuous unrealized loss position [Abstract]
Investments with an unrealized loss of less than 12 months, fair value	860,821	115,403
Investments with an unrealized loss of less than 12 months, unrealized losses	14,143	1,408
Investments with an unrealized loss of 12 months or longer, fair value	62,029	50,083
Investments with an unrealized loss of 12 months or longer, unrealized losses	2,979	1,226
Total investments with an unrealized loss, fair value	922,850	165,486
Total investments with an unrealized loss, unrealized losses	17,122	2,634
Asset-backed securities
Available-for-sale securities, continuous unrealized loss position [Abstract]
Investments with an unrealized loss of less than 12 months, fair value	102,604	68,742
Investments with an unrealized loss of less than 12 months, unrealized losses	583	198
Investments with an unrealized loss of 12 months or longer, fair value	5,636	14,136
Investments with an unrealized loss of 12 months or longer, unrealized losses	6	118
Total investments with an unrealized loss, fair value	108,240	82,878
Total investments with an unrealized loss, unrealized losses	589	316
Corporate notes
Available-for-sale securities, continuous unrealized loss position [Abstract]
Investments with an unrealized loss of less than 12 months, fair value	33,468	22,168
Investments with an unrealized loss of less than 12 months, unrealized losses	963	547
Investments with an unrealized loss of 12 months or longer, fair value	4,471	11,944
Investments with an unrealized loss of 12 months or longer, unrealized losses	127	100
Total investments with an unrealized loss, fair value	37,939	34,112
Total investments with an unrealized loss, unrealized losses	$ 1,090	$ 647

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Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer.

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Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563

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