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Securities - Available-for-sale Securities in Continuous Loss Position (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Available-for-sale, fair value, less than 12 months	$ 8,915	$ 41,734
Available-for-sale, gross unrealized losses, less than 12 months	(29)	(542)
Available-for-sale, fair value, 12 months or greater	106,687	89,289
Available-for-sale, gross unrealized losses, 12 months or greater	(2,264)	(2,428)
Securities available for sale	115,602	131,023
Available-for-sale, gross unrealized losses, total	(2,293)	(2,970)
U.S. Government-sponsored enterprises (GSEs) [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale, fair value, less than 12 months	0	14,763
Available-for-sale, gross unrealized losses, less than 12 months	0	(237)
Available-for-sale, fair value, 12 months or greater	28,807	13,728
Available-for-sale, gross unrealized losses, 12 months or greater	(299)	(389)
Securities available for sale	28,807	28,491
Available-for-sale, gross unrealized losses, total	(299)	(626)
Municipal securities [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale, fair value, less than 12 months	0	16,455
Available-for-sale, gross unrealized losses, less than 12 months	0	(150)
Available-for-sale, fair value, 12 months or greater	4,059	4,767
Available-for-sale, gross unrealized losses, 12 months or greater	(838)	(213)
Securities available for sale	4,059	21,222
Available-for-sale, gross unrealized losses, total	(838)	(363)
Other debt securities [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale, fair value, less than 12 months	0	0
Available-for-sale, gross unrealized losses, less than 12 months	0	0
Available-for-sale, fair value, 12 months or greater	935	910
Available-for-sale, gross unrealized losses, 12 months or greater	(43)	(67)
Securities available for sale	935	910
Available-for-sale, gross unrealized losses, total	(43)	(67)
Mortgage-backed securities (GSEs) [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale, fair value, less than 12 months	8,915	10,516
Available-for-sale, gross unrealized losses, less than 12 months	(29)	(155)
Available-for-sale, fair value, 12 months or greater	72,886	69,884
Available-for-sale, gross unrealized losses, 12 months or greater	(1,084)	(1,759)
Securities available for sale	81,801	80,400
Available-for-sale, gross unrealized losses, total	$ (1,113)	$ (1,914)

X

- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563

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Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563

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+ References

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position.

+ References

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Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position.

+ References

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-Publisher FASB
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-Paragraph 6
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