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Gross unrealized losses and fair value by length of time that the individual available-for-sale securities have been in a continuous unrealized loss position are as follows: (Details) $ in Thousands	Sep. 30, 2019 USD ($)	Dec. 31, 2018 USD ($)
Marketable Securities [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	131	221
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 89,961	$ 139,671
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	419	1,116
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	176,281	387,672
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	1,704	10,700
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	266,242	527,343
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 2,123	$ 11,816
US Government Agencies Debt Securities [Member]
Marketable Securities [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	32	58
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 36,162	$ 72,679
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	132	533
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	59,843	144,636
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	574	3,500
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	96,005	217,315
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 706	$ 4,033
Residential Mortgage Backed Securities [Member]
Marketable Securities [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	98	151
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 53,769	$ 61,199
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	287	527
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	116,438	225,995
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	1,130	6,766
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	170,207	287,194
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 1,417	$ 7,293
US States and Political Subdivisions Debt Securities [Member]
Marketable Securities [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	1	11
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 30	$ 4,299
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		50
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		17,041
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		434
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	30	21,340
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		$ 484
Corporate Debt Securities [Member]
Marketable Securities [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions		1
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		$ 1,494
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		6
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		1,494
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		$ 6

X

- 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

No definition available.

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- Definition

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=118939692&loc=d3e27337-111563

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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 less than twelve months.

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- Definition

Number of investment positions in available-for-sale investments in a continuous unrealized loss position for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (b)(3)
-URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27290-111563

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