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Investment Securities (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Marketable Securities [Line Items] |  |  |
Amortized Cost |  | $ 345,580 | $ 283,648
Available-for-sale Securities, Gross Unrealized Gain | $ 124,300 | 14,554 | 4,153
Gross Unrealized Losses |  | 268 | 1,001
Available-for-sale Securities |  | 359,866 | 286,800
US Treasury Securities [Member] |  |  |
Marketable Securities [Line Items] |  |  |
Amortized Cost |  | 1,501 | 7,190
Available-for-sale Securities, Gross Unrealized Gain |  | 1 | 16
Gross Unrealized Losses |  | 0 | 3
Available-for-sale Securities |  | 1,502 | 7,203
US Government-sponsored Enterprises Debt Securities [Member] |  |  |
Marketable Securities [Line Items] |  |  |
Amortized Cost |  | 996 | 984
Available-for-sale Securities, Gross Unrealized Gain |  | 10 | 17
Gross Unrealized Losses |  | 0 | 0
Available-for-sale Securities |  | 1,006 | 1,001
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |  |
Marketable Securities [Line Items] |  |  |
Amortized Cost |  | 222,739 | 182,736
Available-for-sale Securities, Gross Unrealized Gain |  | 7,375 | 1,490
Gross Unrealized Losses |  | 185 | 640
Available-for-sale Securities |  | 229,929 | 183,586
Small Business Administration pools [Member] |  |  |
Marketable Securities [Line Items] |  |  |
Amortized Cost |  | 34,577 | 45,301
Available-for-sale Securities, Gross Unrealized Gain |  | 928 | 259
Gross Unrealized Losses |  | 7 | 217
Available-for-sale Securities |  | 35,498 | 45,343
US States and Political Subdivisions Debt Securities [Member] |  |  |
Marketable Securities [Line Items] |  |  |
Amortized Cost |  | 82,495 | 47,418
Available-for-sale Securities, Gross Unrealized Gain |  | 6,184 | 2,371
Gross Unrealized Losses |  | 76 | 141
Available-for-sale Securities |  | 88,603 | 49,648
Corporate and other securities [Member] |  |  |
Marketable Securities [Line Items] |  |  |
Amortized Cost |  | 3,272 | 19
Available-for-sale Securities, Gross Unrealized Gain |  | 56 | 0
Gross Unrealized Losses |  | 0 | 0
Available-for-sale Securities |  | $ 3,328 | $ 19

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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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