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Securities- Unrealized Losses (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Available-for-sale securities, continuous unrealized loss position [Abstract]
Investments with an unrealized loss of less than 12 months, fair value	$ 741,644	$ 407,150
Investments with an unrealized loss of less than 12 months, unrealized losses	8,572	4,277
Investments with an unrealized loss of 12 months or longer, fair value	259,100	464,283
Investments with an unrealized loss of 12 months or longer, unrealized losses	5,429	13,560
Total investments with an unrealized loss, fair value	1,000,744	871,433
Total investments with an unrealized loss, unrealized losses	14,001	17,837
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	59,973	0
Investments with an unrealized loss of less than 12 months, unrealized losses	11	0
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	59,973	0
Total investments with an unrealized loss, unrealized losses	11	0
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	111,928	9,962
Investments with an unrealized loss of less than 12 months, unrealized losses	2,172	38
Investments with an unrealized loss of 12 months or longer, fair value	5,497	6,091
Investments with an unrealized loss of 12 months or longer, unrealized losses	19	22
Total investments with an unrealized loss, fair value	117,425	16,053
Total investments with an unrealized loss, unrealized losses	2,191	60
Mortgage-backed securities
Available-for-sale securities, continuous unrealized loss position [Abstract]
Investments with an unrealized loss of less than 12 months, fair value	361,860	165,696
Investments with an unrealized loss of less than 12 months, unrealized losses	5,059	1,772
Investments with an unrealized loss of 12 months or longer, fair value	54,747	35,997
Investments with an unrealized loss of 12 months or longer, unrealized losses	959	555
Total investments with an unrealized loss, fair value	416,607	201,693
Total investments with an unrealized loss, unrealized losses	6,018	2,327
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	117,715	175,115
Investments with an unrealized loss of less than 12 months, unrealized losses	1,035	2,220
Investments with an unrealized loss of 12 months or longer, fair value	167,184	345,435
Investments with an unrealized loss of 12 months or longer, unrealized losses	2,712	10,264
Total investments with an unrealized loss, fair value	284,899	520,550
Total investments with an unrealized loss, unrealized losses	3,747	12,484
Asset-backed securities
Available-for-sale securities, continuous unrealized loss position [Abstract]
Investments with an unrealized loss of less than 12 months, fair value	85,178	46,399
Investments with an unrealized loss of less than 12 months, unrealized losses	285	207
Investments with an unrealized loss of 12 months or longer, fair value	6,859	52,840
Investments with an unrealized loss of 12 months or longer, unrealized losses	145	450
Total investments with an unrealized loss, fair value	92,037	99,239
Total investments with an unrealized loss, unrealized losses	430	657
Corporate notes
Available-for-sale securities, continuous unrealized loss position [Abstract]
Investments with an unrealized loss of less than 12 months, fair value	4,990	9,978
Investments with an unrealized loss of less than 12 months, unrealized losses	10	40
Investments with an unrealized loss of 12 months or longer, fair value	24,813	23,920
Investments with an unrealized loss of 12 months or longer, unrealized losses	1,594	2,269
Total investments with an unrealized loss, fair value	29,803	33,898
Total investments with an unrealized loss, unrealized losses	$ 1,604	$ 2,309

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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=123581744&loc=d3e27337-111563

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