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Investment Securities (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
Marketable Securities [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | $ 399,360 | $ 345,580
Available-for-sale Securities, Gross Unrealized Gain | 10,193 | 14,554
Available-for-sale Securities, Gross Unrealized Loss | 3,705 | 268
Available-for-sale Securities | 405,848 | 359,866
US Treasury Securities [Member] |  |
Marketable Securities [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 15,715 | 1,501
Available-for-sale Securities, Gross Unrealized Gain |  | 1
Available-for-sale Securities, Gross Unrealized Loss | 704 | 0
Available-for-sale Securities | 15,011 | 1,502
US Government-sponsored Enterprises Debt Securities [Member] |  |
Marketable Securities [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 999 | 996
Available-for-sale Securities, Gross Unrealized Gain | 3 | 10
Available-for-sale Securities, Gross Unrealized Loss | 0 | 0
Available-for-sale Securities | 1,002 | 1,006
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Marketable Securities [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 257,874 | 222,739
Available-for-sale Securities, Gross Unrealized Gain | 4,899 | 7,375
Available-for-sale Securities, Gross Unrealized Loss | 1,867 | 185
Available-for-sale Securities | 260,906 | 229,929
Small Business Administration pools [Member] |  |
Marketable Securities [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 37,115 | 34,577
Available-for-sale Securities, Gross Unrealized Gain | 685 | 928
Available-for-sale Securities, Gross Unrealized Loss | 18 | 7
Available-for-sale Securities | 37,782 | 35,498
US States and Political Subdivisions Debt Securities [Member] |  |
Marketable Securities [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 84,383 | 82,495
Available-for-sale Securities, Gross Unrealized Gain | 4,554 | 6,184
Available-for-sale Securities, Gross Unrealized Loss | 1,116 | 76
Available-for-sale Securities | 87,821 | 88,603
Corporate and other securities [Member] |  |
Marketable Securities [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 3,274 | 3,272
Available-for-sale Securities, Gross Unrealized Gain | 52 | 56
Available-for-sale Securities, Gross Unrealized Loss | 0 | 0
Available-for-sale Securities | $ 3,326 | $ 3,328

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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References No definition available. + Details
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