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Investment Securities (Amortized Cost and Fair Value of Investment Securities) (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
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Schedule of Held-to-maturity Securities And Available-for-sale Securities [Line Items] |  |
Amortized cost: Total available-for-sale debt securities | $ 195,313 | $ 180,557
Gross unrealized gains: Available-for-sale debt securities | 8,671 | 4,698
Gross unrealized losses: Available-for-sale debt securities |  | (138)
Fair value: Available-for-sale debt securities | 203,984 | 185,117
Agency - GSE [Member] |  |
Schedule of Held-to-maturity Securities And Available-for-sale Securities [Line Items] |  |
Amortized cost: Total available-for-sale debt securities | 5,945 | 5,941
Gross unrealized gains: Available-for-sale debt securities | 411 | 218
Fair value: Available-for-sale debt securities | 6,356 | 6,159
Obligations Of States And Political Subdivisions [Member] |  |
Schedule of Held-to-maturity Securities And Available-for-sale Securities [Line Items] |  |
Amortized cost: Total available-for-sale debt securities | 52,813 | 51,857
Gross unrealized gains: Available-for-sale debt securities | 3,441 | 2,871
Gross unrealized losses: Available-for-sale debt securities |  | (10)
Fair value: Available-for-sale debt securities | 56,254 | 54,718
MBS - GSE Residential [Member] |  |
Schedule of Held-to-maturity Securities And Available-for-sale Securities [Line Items] |  |
Amortized cost: Total available-for-sale debt securities | 136,555 | 122,759
Gross unrealized gains: Available-for-sale debt securities | 4,819 | 1,609
Gross unrealized losses: Available-for-sale debt securities |  | (128)
Fair value: Available-for-sale debt securities | $ 141,374 | $ 124,240

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
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