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Securities- Unrealized Losses (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Available-for-sale securities, continuous unrealized loss position [Abstract]
Investments with an unrealized loss of less than 12 months, fair value	$ 345,221	$ 781,054
Investments with an unrealized loss of less than 12 months, unrealized losses	6,979	7,851
Investments with an unrealized loss of 12 months or longer, fair value	619,882	516,267
Investments with an unrealized loss of 12 months or longer, unrealized losses	33,712	9,934
Total investments with an unrealized loss, fair value	965,103	1,297,321
Total investments with an unrealized loss, unrealized losses	40,691	17,785
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	40,505
Investments with an unrealized loss of less than 12 months, unrealized losses	0	14
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	0	40,505
Total investments with an unrealized loss, unrealized losses	0	14
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	0	1,222
Investments with an unrealized loss of less than 12 months, unrealized losses	0	1
Investments with an unrealized loss of 12 months or longer, fair value	6,507	30,892
Investments with an unrealized loss of 12 months or longer, unrealized losses	32	709
Total investments with an unrealized loss, fair value	6,507	32,114
Total investments with an unrealized loss, unrealized losses	32	710
Mortgage-backed securities
Available-for-sale securities, continuous unrealized loss position [Abstract]
Investments with an unrealized loss of less than 12 months, fair value	59,233	458,881
Investments with an unrealized loss of less than 12 months, unrealized losses	614	5,102
Investments with an unrealized loss of 12 months or longer, fair value	43,978	163,767
Investments with an unrealized loss of 12 months or longer, unrealized losses	773	2,674
Total investments with an unrealized loss, fair value	103,211	622,648
Total investments with an unrealized loss, unrealized losses	1,387	7,776
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	182,186	204,958
Investments with an unrealized loss of less than 12 months, unrealized losses	3,557	1,938
Investments with an unrealized loss of 12 months or longer, fair value	496,371	244,884
Investments with an unrealized loss of 12 months or longer, unrealized losses	28,448	5,311
Total investments with an unrealized loss, fair value	678,557	449,842
Total investments with an unrealized loss, unrealized losses	32,005	7,249
Asset-backed securities
Available-for-sale securities, continuous unrealized loss position [Abstract]
Investments with an unrealized loss of less than 12 months, fair value	59,994	75,488
Investments with an unrealized loss of less than 12 months, unrealized losses	1,260	796
Investments with an unrealized loss of 12 months or longer, fair value	54,376	59,816
Investments with an unrealized loss of 12 months or longer, unrealized losses	1,350	497
Total investments with an unrealized loss, fair value	114,370	135,304
Total investments with an unrealized loss, unrealized losses	2,610	1,293
Corporate notes
Available-for-sale securities, continuous unrealized loss position [Abstract]
Investments with an unrealized loss of less than 12 months, fair value	43,808	0
Investments with an unrealized loss of less than 12 months, unrealized losses	1,548	0
Investments with an unrealized loss of 12 months or longer, fair value	18,650	16,908
Investments with an unrealized loss of 12 months or longer, unrealized losses	3,109	743
Total investments with an unrealized loss, fair value	62,458	16,908
Total investments with an unrealized loss, unrealized losses	$ 4,657	$ 743

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+ 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=121645371&loc=d3e27337-111563

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