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Investment Securities - Carrying value and estimated fair value (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Schedule of Available-for-sale Securities |  |
Debt Securities, Amortized Cost | $ 689,001 | $ 466,747
Available-for-sale investment securities, Amortized cost | 689,001 | 466,747
Available-for-sale debt securities | 710,092 | 470,746
Available-for-sale investment securities | 710,092 | 470,746
Available-for-sale Securities, Gross Unrealized Gains | 23,371 | 8,688
Available-for-sale Securities, Gross Unrealized Losses | (2,280) | (4,689)
U.S. Government agencies |  |
Schedule of Available-for-sale Securities |  |
Debt Securities, Amortized Cost | 651 | 14,740
Available-for-sale debt securities | 680 | 14,494
Available-for-sale Securities, Gross Unrealized Gains | 29 | 12
Available-for-sale Securities, Gross Unrealized Losses | 0 | (258)
Obligations of states and political subdivisions |  |
Schedule of Available-for-sale Securities |  |
Debt Securities, Amortized Cost | 361,734 | 89,574
Available-for-sale debt securities | 379,565 | 91,111
Available-for-sale Securities, Gross Unrealized Gains | 18,170 | 2,965
Available-for-sale Securities, Gross Unrealized Losses | (339) | (1,428)
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations |  |
Schedule of Available-for-sale Securities |  |
Debt Securities, Amortized Cost | 214,203 | 198,125
Available-for-sale debt securities | 216,298 | 196,719
Available-for-sale Securities, Gross Unrealized Gains | 3,575 | 1,409
Available-for-sale Securities, Gross Unrealized Losses | (1,480) | (2,815)
Private label residential mortgage and asset backed securities |  |
Schedule of Available-for-sale Securities |  |
Debt Securities, Amortized Cost | 82,413 | 155,308
Available-for-sale debt securities | 83,508 | 159,378
Available-for-sale Securities, Gross Unrealized Gains | 1,337 | 4,223
Available-for-sale Securities, Gross Unrealized Losses | (242) | (153)
Corporate Debt Securities [Member] |  |
Schedule of Available-for-sale Securities |  |
Debt Securities, Amortized Cost | 30,000 | 9,000
Available-for-sale debt securities | 30,041 | 9,044
Available-for-sale Securities, Gross Unrealized Gains | 260 | 79
Available-for-sale Securities, Gross Unrealized Losses | $ (219) | $ (35)

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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=121645371&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=121645371&loc=d3e27161-111563 + Details
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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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