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Securities Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
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Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract] |  |  |
Amortized cost |  | $ 194,282,000 | $ 20,762,000
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain |  | 152,000 | 114,000
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss |  | 1,303,000 | 46,000
Fair Value | [1] | 193,131,000 | 20,830,000
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract] |  |  |
Due in one year or less |  | 325,000 |
Due in one year to five years |  | 5,710,000 |
Due in five to ten years |  | 7,980,000 |
Due after ten years |  | 180,267,000 |
Mortgage-backed securities |  | 0 |
Asset-backed securities |  | 0 |
Amortized cost |  | 194,282,000 | 20,762,000
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract] |  |  |
Due in one year or less |  | 326,000 |
Due in one year to five years |  | 5,700,000 |
Due in five to ten years |  | 7,935,000 |
Due after ten years |  | 179,170,000 |
Mortgage-backed securities |  | 0 |
Asset-backed securities |  | 0 |
Fair Value | [1] | 193,131,000 | 20,830,000
State And Municipal Securities |  |  |
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract] |  |  |
Amortized cost |  | 194,282,000 | 20,762,000
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain |  | 152,000 | 114,000
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss |  | 1,303,000 | 46,000
Fair Value |  | 193,131,000 | 20,830,000
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract] |  |  |
Amortized cost |  | 194,282,000 | 20,762,000
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract] |  |  |
Fair Value |  | $ 193,131,000 | $ 20,830,000
[1] | Estimated fair values are consistent with an exit-price concept. The assumptions used to estimate the fair values are intended to approximate those that a market-participant would realize in a hypothetical orderly transaction.

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- Definition Amount of investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26610-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 + Details
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- Definition Amount of accumulated unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 + Details
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