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Securities- Unrealized Losses (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Available-for-sale securities, continuous unrealized loss position [Abstract]
Investments with an unrealized loss of less than 12 months, fair value	$ 285,139	$ 1,347,820
Investments with an unrealized loss of less than 12 months, unrealized losses	2,316	26,783
Investments with an unrealized loss of 12 months or longer, fair value	551,403	1,161,369
Investments with an unrealized loss of 12 months or longer, unrealized losses	8,141	32,811
Total investments with an unrealized loss, fair value	836,542	2,509,189
Total investments with an unrealized loss, unrealized losses	10,457	59,594
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	0	30,054
Investments with an unrealized loss of less than 12 months, unrealized losses	0	22
Investments with an unrealized loss of 12 months or longer, fair value	250	246
Investments with an unrealized loss of 12 months or longer, unrealized losses	0	3
Total investments with an unrealized loss, fair value	250	30,300
Total investments with an unrealized loss, unrealized losses	0	25
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	2,064	13,697
Investments with an unrealized loss of less than 12 months, unrealized losses	9	328
Investments with an unrealized loss of 12 months or longer, fair value	35,391	42,539
Investments with an unrealized loss of 12 months or longer, unrealized losses	986	1,018
Total investments with an unrealized loss, fair value	37,455	56,236
Total investments with an unrealized loss, unrealized losses	995	1,346
Mortgage-backed securities
Available-for-sale securities, continuous unrealized loss position [Abstract]
Investments with an unrealized loss of less than 12 months, fair value	84,937	203,299
Investments with an unrealized loss of less than 12 months, unrealized losses	535	2,134
Investments with an unrealized loss of 12 months or longer, fair value	471,224	882,231
Investments with an unrealized loss of 12 months or longer, unrealized losses	5,896	26,500
Total investments with an unrealized loss, fair value	556,161	1,085,530
Total investments with an unrealized loss, unrealized losses	6,431	28,634
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	76,291	805,821
Investments with an unrealized loss of less than 12 months, unrealized losses	489	18,643
Investments with an unrealized loss of 12 months or longer, fair value	11,663	198,610
Investments with an unrealized loss of 12 months or longer, unrealized losses	53	4,078
Total investments with an unrealized loss, fair value	87,954	1,004,431
Total investments with an unrealized loss, unrealized losses	542	22,721
Asset-backed securities
Available-for-sale securities, continuous unrealized loss position [Abstract]
Investments with an unrealized loss of less than 12 months, fair value	104,510	268,677
Investments with an unrealized loss of less than 12 months, unrealized losses	775	4,118
Investments with an unrealized loss of 12 months or longer, fair value	22,373	11,828
Investments with an unrealized loss of 12 months or longer, unrealized losses	201	227
Total investments with an unrealized loss, fair value	126,883	280,505
Total investments with an unrealized loss, unrealized losses	976	4,345
Corporate notes
Available-for-sale securities, continuous unrealized loss position [Abstract]
Investments with an unrealized loss of less than 12 months, fair value	17,337	26,272
Investments with an unrealized loss of less than 12 months, unrealized losses	508	1,538
Investments with an unrealized loss of 12 months or longer, fair value	10,502	25,915
Investments with an unrealized loss of 12 months or longer, unrealized losses	1,005	985
Total investments with an unrealized loss, fair value	27,839	52,187
Total investments with an unrealized loss, unrealized losses	$ 1,513	$ 2,523

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- Definition

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.

+ References

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+ 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=118939692&loc=d3e27337-111563

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