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Investments - Schedule of Unrealized Loss on Investments (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, fair value	$ 160,889	$ 110,081
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	600	2,548
12 months or more, fair value	55,333	492,727
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	660	12,610
Total, fair value	216,222	602,808
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	1,260	15,158
Obligations of U.S. Government-sponsored enterprises
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, fair value		19,622
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		322
12 months or more, fair value		78,876
Securities Available for Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses		1,106
Total, fair value		98,498
Securities Available for Sale Continuous Unrealized Loss Position, Total Aggregate Losses		1,428
Obligations of states and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, fair value	36,066	3,102
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	248	15
12 months or more, fair value	0	14,156
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	182
Total, fair value	36,066	17,258
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	248	197
Agency mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, fair value	124,823	87,357
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	352	2,211
12 months or more, fair value	55,333	389,770
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	660	11,285
Total, fair value	180,156	477,127
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 1,012	13,496
US Treasury Bill Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, fair value		0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		0
12 months or more, fair value		9,925
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		37
Total, fair value		9,925
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		$ 37

X

- Definition

Amount of the excess of amortized cost basis over fair value of securities that have been in a loss position for twelve months or longer for securities which are categorized neither as held-to-maturity nor trading securities.

+ References

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Amount of the excess of amortized cost basis over fair value of securities in a loss position and categorized neither as held-to-maturity nor trading securities.

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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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- 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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