Investment Securities - Realized Gains and Losses (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]
Gross gains, sale transactions	$ 1,769	$ 0	$ 271
Gross losses, sale transactions	(3,881)	(25)	(58)
Gains on sale transactions, net	(2,112)	(25)	213
Gross gains, maturities and other securities transactions	42	43	615
Gross losses, maturities and other securities transactions	(272)	(38)	(51)
Gains (losses) on maturities and other securities transactions, net	(230)	5	564
(Losses) gains on securities transactions, net	$ (2,342)	$ (20)	$ 777

Amount of unrealized and realized gain (loss) on investment in debt and equity securities.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
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-Subparagraph (SX 210.5-03(9)(a))
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The net realized gain (loss) on investments sold during the period, not including gains (losses) on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, which, for cash flow reporting, is a component of proceeds from investing activities.

+ References

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-Publisher FASB
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-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
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The difference between the carrying value and the sale price of an investment. A gain would be recognized when the sale price of the investment is greater than the carrying value of the investment. This element refers to the Gain included in earnings and not to the cash proceeds of the sale.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(3)(a))
-URI http://asc.fasb.org/extlink&oid=114873790&loc=SL114874131-224263

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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-Section 45
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-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

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-URI http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260

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- References

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The difference between the carrying value and the sale price of an investment. A loss would be recognized when the sale price of the investment is less than the carrying value of the investment. This element refers to the Loss included in earnings and not to the cash proceeds of the sale.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
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-Subparagraph (SX 210.5-03(b)(9)(a))
-URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227

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-URI http://asc.fasb.org/extlink&oid=114873790&loc=SL114874131-224263

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Gains (losses) on maturities and other securities transactions

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No definition available.

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Gross gains realized from maturities and other securities transactions not separately or otherwise categorized as trading, available-for-sale, or held-to-maturity.

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Gross losses realized from maturities and other securities transactions not separately or otherwise categorized as trading, available-for-sale, or held-to-maturity.

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