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Securities Securities - Unrealized Losses (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Investment securities, continuous unrealized loss position [Abstract]
Investments with an Unrealized Loss of less than 12 months, Fair Value	$ 407,150	$ 781,054
Investments with an Unrealized Loss of less than 12 months, Unrealized Losses	4,277	7,851
Investments with an Unrealized Loss of 12 months or longer, Fair Value	464,283	516,267
Investments with an Unrealized Loss of 12 months or longer, Unrealized Losses	13,560	9,934
Total Investments with an Unrealized Loss, Fair Value	871,433	1,297,321
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	17,837	17,785
US Treasury Securities
Investment 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
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	0	14
U.S. Government Agency Securities
Investment securities, continuous unrealized loss position [Abstract]
Investments with an Unrealized Loss of less than 12 months, Fair Value	9,962	1,222
Investments with an Unrealized Loss of less than 12 months, Unrealized Losses	38	1
Investments with an Unrealized Loss of 12 months or longer, Fair Value	6,091	30,892
Investments with an Unrealized Loss of 12 months or longer, Unrealized Losses	22	709
Total Investments with an Unrealized Loss, Fair Value	16,053	32,114
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	60	710
Mortgage-backed Agency Securities
Investment securities, continuous unrealized loss position [Abstract]
Investments with an Unrealized Loss of less than 12 months, Fair Value	165,696	458,881
Investments with an Unrealized Loss of less than 12 months, Unrealized Losses	1,772	5,102
Investments with an Unrealized Loss of 12 months or longer, Fair Value	35,997	163,767
Investments with an Unrealized Loss of 12 months or longer, Unrealized Losses	555	2,674
Total Investments with an Unrealized Loss, Fair Value	201,693	622,648
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	2,327	7,776
State and Municipal Securities
Investment securities, continuous unrealized loss position [Abstract]
Investments with an Unrealized Loss of less than 12 months, Fair Value	175,115	204,958
Investments with an Unrealized Loss of less than 12 months, Unrealized Losses	2,220	1,938
Investments with an Unrealized Loss of 12 months or longer, Fair Value	345,435	244,884
Investments with an Unrealized Loss of 12 months or longer, Unrealized Losses	10,264	5,311
Total Investments with an Unrealized Loss, Fair Value	520,550	449,842
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	12,484	7,249
Asset-backed Securities
Investment securities, continuous unrealized loss position [Abstract]
Investments with an Unrealized Loss of less than 12 months, Fair Value	46,399	75,488
Investments with an Unrealized Loss of less than 12 months, Unrealized Losses	207	796
Investments with an Unrealized Loss of 12 months or longer, Fair Value	52,840	59,816
Investments with an Unrealized Loss of 12 months or longer, Unrealized Losses	450	497
Total Investments with an Unrealized Loss, Fair Value	99,239	135,304
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	657	1,293
Corporate Notes
Investment securities, continuous unrealized loss position [Abstract]
Investments with an Unrealized Loss of less than 12 months, Fair Value	9,978	0
Investments with an Unrealized Loss of less than 12 months, Unrealized Losses	40	0
Investments with an Unrealized Loss of 12 months or longer, Fair Value	23,920	16,908
Investments with an Unrealized Loss of 12 months or longer, Unrealized Losses	2,269	743
Total Investments with an Unrealized Loss, Fair Value	33,898	16,908
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 2,309	$ 743

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- Definition

Investment Securities, Continuous Unrealized Loss Position both available-for-sale and held-to-maturity.

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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=121645371&loc=d3e27337-111563

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