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Investment Securities - Investment Securities' Gross Unrealized Losses and Fair Value by Investment Category and Length of Time that Individual Securities Have Continuous Unrealized Loss Position (Details) $ in Thousands | Mar. 31, 2020 USD ($) Security | Dec. 31, 2019 USD ($) Security
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Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Number of securities in unrealized loss positions, less than twelve months | Security | 43 | 17
Number of securities in unrealized loss positions, twelve months or more | Security | 2 | 3
Number of securities in unrealized loss positions | Security | 45 | 20
Less than twelve months Fair Value | $ 61,188 | $ 31,395
Twelve months or more Fair Value | 811 | 1,330
Total Fair Value | 61,999 | 32,725
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Less than twelve months Unrealized Losses | (4,417) | (226)
Twelve months or more Unrealized Losses | (40) | (7)
Total Unrealized Losses | $ (4,457) | $ (233)
US Treasury, Agencies and GSEs [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Number of securities in unrealized loss positions, less than twelve months | Security | 1 | 4
Number of securities in unrealized loss positions, twelve months or more | Security | 0 | 0
Number of securities in unrealized loss positions | Security | 1 | 4
Less than twelve months Fair Value | $ 4,952 | $ 16,820
Twelve months or more Fair Value | 0 | 0
Total Fair Value | 4,952 | 16,820
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Less than twelve months Unrealized Losses | (25) | (30)
Twelve months or more Unrealized Losses | 0 | 0
Total Unrealized Losses | $ (25) | $ (30)
State and Political Subdivisions [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Number of securities in unrealized loss positions, less than twelve months | Security | 5 |
Number of securities in unrealized loss positions, twelve months or more | Security | 0 |
Number of securities in unrealized loss positions | Security | 5 |
Less than twelve months Fair Value | $ 5,390 |
Twelve months or more Fair Value | 0 |
Total Fair Value | 5,390 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Less than twelve months Unrealized Losses | (515) |
Twelve months or more Unrealized Losses | 0 |
Total Unrealized Losses | $ (515) |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Number of securities in unrealized loss positions, less than twelve months | Security | 2 | 1
Number of securities in unrealized loss positions, twelve months or more | Security | 0 | 0
Number of securities in unrealized loss positions | Security | 2 | 1
Less than twelve months Fair Value | $ 3,046 | $ 3,027
Twelve months or more Fair Value | 0 | 0
Total Fair Value | 3,046 | 3,027
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Less than twelve months Unrealized Losses | (81) | (4)
Twelve months or more Unrealized Losses | 0 | 0
Total Unrealized Losses | $ (81) | $ (4)
Corporate [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Number of securities in unrealized loss positions, less than twelve months | Security | 8 | 1
Number of securities in unrealized loss positions, twelve months or more | Security | 0 | 0
Number of securities in unrealized loss positions | Security | 8 | 1
Less than twelve months Fair Value | $ 5,143 | $ 786
Twelve months or more Fair Value | 0 | 0
Total Fair Value | 5,143 | 786
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Less than twelve months Unrealized Losses | (337) | (23)
Twelve months or more Unrealized Losses | 0 | 0
Total Unrealized Losses | $ (337) | $ (23)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Number of securities in unrealized loss positions, less than twelve months | Security | 12 | 2
Number of securities in unrealized loss positions, twelve months or more | Security | 0 | 0
Number of securities in unrealized loss positions | Security | 12 | 2
Less than twelve months Fair Value | $ 12,236 | $ 2,974
Twelve months or more Fair Value | 0 | 0
Total Fair Value | 12,236 | 2,974
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Less than twelve months Unrealized Losses | (1,012) | (29)
Twelve months or more Unrealized Losses | 0 | 0
Total Unrealized Losses | $ (1,012) | $ (29)
Asset Backed Securities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Number of securities in unrealized loss positions, less than twelve months | Security | 11 | 3
Number of securities in unrealized loss positions, twelve months or more | Security | 1 | 1
Number of securities in unrealized loss positions | Security | 12 | 4
Less than twelve months Fair Value | $ 12,027 | $ 5,211
Twelve months or more Fair Value | 367 | 594
Total Fair Value | 12,394 | 5,805
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Less than twelve months Unrealized Losses | (1,797) | (7)
Twelve months or more Unrealized Losses | (14) | (12)
Total Unrealized Losses | $ (1,811) | $ (19)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Number of securities in unrealized loss positions, less than twelve months | Security | 12 | 6
Number of securities in unrealized loss positions, twelve months or more | Security | 0 | 0
Number of securities in unrealized loss positions | Security | 12 | 6
Less than twelve months Fair Value | $ 22,048 | $ 11,091
Twelve months or more Fair Value | 0 | 0
Total Fair Value | 22,048 | 11,091
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Less than twelve months Unrealized Losses | (1,992) | (115)
Twelve months or more Unrealized Losses | 0 | 0
Total Unrealized Losses | $ (1,992) | $ (115)
Residential Mortgage-Backed - US Agency [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Number of securities in unrealized loss positions, less than twelve months | Security | 7 | 10
Number of securities in unrealized loss positions, twelve months or more | Security | 1 | 4
Number of securities in unrealized loss positions | Security | 8 | 14
Less than twelve months Fair Value | $ 7,989 | $ 10,709
Twelve months or more Fair Value | 1,483 | 2,543
Total Fair Value | 9,472 | 13,252
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Less than twelve months Unrealized Losses | (133) | (77)
Twelve months or more Unrealized Losses | (6) | (11)
Total Unrealized Losses | $ (139) | $ (88)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Number of securities in unrealized loss positions, less than twelve months | Security | 3 | 0
Number of securities in unrealized loss positions, twelve months or more | Security | 0 | 1
Number of securities in unrealized loss positions | Security | 3 | 1
Less than twelve months Fair Value | $ 4,021 | $ 0
Twelve months or more Fair Value | 0 | 198
Total Fair Value | 4,021 | 198
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Less than twelve months Unrealized Losses | (66) | 0
Twelve months or more Unrealized Losses | 0 | (3)
Total Unrealized Losses | $ (66) | $ (3)
Collateralized Mortgage Obligations - US Agency [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Number of securities in unrealized loss positions, less than twelve months | Security | 11 | 10
Number of securities in unrealized loss positions, twelve months or more | Security | 8 | 10
Number of securities in unrealized loss positions | Security | 19 | 20
Less than twelve months Fair Value | $ 18,524 | $ 15,791
Twelve months or more Fair Value | 7,132 | 10,034
Total Fair Value | 25,656 | 25,825
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Less than twelve months Unrealized Losses | (212) | (67)
Twelve months or more Unrealized Losses | (593) | (503)
Total Unrealized Losses | $ (805) | $ (570)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Number of securities in unrealized loss positions, less than twelve months | Security | 3 | 2
Number of securities in unrealized loss positions, twelve months or more | Security | 0 | 0
Number of securities in unrealized loss positions | Security | 3 | 2
Less than twelve months Fair Value | $ 5,623 | $ 4,907
Twelve months or more Fair Value | 0 | 0
Total Fair Value | 5,623 | 4,907
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Less than twelve months Unrealized Losses | (177) | (29)
Twelve months or more Unrealized Losses | 0 | 0
Total Unrealized Losses | $ (177) | $ (29)
Collateralized Mortgage Obligations - Private Label [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Number of securities in unrealized loss positions, less than twelve months | Security | 9 | 2
Number of securities in unrealized loss positions, twelve months or more | Security | 4 | 5
Number of securities in unrealized loss positions | Security | 13 | 7
Less than twelve months Fair Value | $ 9,434 | $ 3,818
Twelve months or more Fair Value | 4,339 | 3,959
Total Fair Value | 13,773 | 7,777
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Less than twelve months Unrealized Losses | (477) | (7)
Twelve months or more Unrealized Losses | (355) | (36)
Total Unrealized Losses | $ (832) | $ (43)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Number of securities in unrealized loss positions, less than twelve months | Security | 11 | 6
Number of securities in unrealized loss positions, twelve months or more | Security | 2 | 2
Number of securities in unrealized loss positions | Security | 13 | 8
Less than twelve months Fair Value | $ 14,214 | $ 9,396
Twelve months or more Fair Value | 811 | 1,132
Total Fair Value | 15,025 | 10,528
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Less than twelve months Unrealized Losses | (1,089) | (49)
Twelve months or more Unrealized Losses | (40) | (4)
Total Unrealized Losses | $ (1,129) | $ (53)
Debt Securities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Number of securities in unrealized loss positions, less than twelve months | Security | 52 | 30
Number of securities in unrealized loss positions, twelve months or more | Security | 14 | 20
Number of securities in unrealized loss positions | Security | 66 | 50
Less than twelve months Fair Value | $ 63,459 | $ 53,135
Twelve months or more Fair Value | 13,321 | 17,130
Total Fair Value | 76,780 | 70,265
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Less than twelve months Unrealized Losses | (3,496) | (211)
Twelve months or more Unrealized Losses | (968) | (562)
Total Unrealized Losses | $ (4,464) | $ (773)

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