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Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Time certificates of deposit least amount | $ 100,000 | $ 100,000
Held to Maturity, Fair Value, Total | 820,430,000 | 752,177,000
Debt Securities, Available-for-sale, Amortized Cost | $ 593,167,000 | $ 395,453,000
Preferred Stock, par value | $ 0.01 | $ 0.01
Preferred Stock, Shares Authorized | 1,000,000 | 1,000,000
Preferred Stock, shares outstanding | 0 | 0
Common Stock, par value | $ 0.01 | $ 0.01
Common Stock, shares authorized | 75,000,000 | 75,000,000
Common Stock, Shares, Outstanding | 33,024,882 | 32,965,692
Common Stock, unvested restricted Stock awards | 144,790 | 135,205
Shares Held in Rabbi Trust | 83,629 | 84,126
Common Stock Outstanding |  |
Common Stock, Shares, Outstanding | 33,024,882 | 32,965,692
Subordinated Debt [Member] |  |
Unamortized Debt Issuance Expense | $ 280,000 | $ 304,000
Long-term Debt [Member] |  |
Unamortized Debt Issuance Expense | $ 26,000 | $ 40,000

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- Definition Amortized cost of 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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121558606&loc=SL82898722-210454 + Details
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- Definition Fair value of 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 (aa) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121645371&loc=SL120269820-111563 + Details
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