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Investments - Carrying value and estimated fair value (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
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Schedule of Available-for-sale Securities |  |
Amortized Cost | $ 524,829 |
Available-for-sale debt securities | 522,943 | $ 470,746
Amortized Cost | 524,829 | 466,747
Gross Unrealized Gains | 9,904 | 8,688
Gross Unrealized Losses | (11,790) | (4,689)
Available-for-sale securities | 522,943 | 470,746
U.S. Government agencies |  |
Schedule of Available-for-sale Securities |  |
Amortized Cost | 43,550 | 14,740
Gross Unrealized Gains | 28 | 12
Gross Unrealized Losses | (366) | (258)
Available-for-sale debt securities | 43,212 | 14,494
Obligations of states and political subdivisions |  |
Schedule of Available-for-sale Securities |  |
Amortized Cost | 200,677 | 89,574
Gross Unrealized Gains | 6,393 | 2,965
Gross Unrealized Losses | (1,816) | (1,428)
Available-for-sale debt securities | 205,254 | 91,111
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations |  |
Schedule of Available-for-sale Securities |  |
Amortized Cost | 205,987 | 198,125
Gross Unrealized Gains | 2,804 | 1,409
Gross Unrealized Losses | (6,486) | (2,815)
Available-for-sale debt securities | 202,305 | 196,719
Private label mortgage and asset backed securities |  |
Schedule of Available-for-sale Securities |  |
Amortized Cost | 65,615 | 155,308
Gross Unrealized Gains | 679 | 4,223
Gross Unrealized Losses | (2,371) | (153)
Available-for-sale debt securities | 63,923 | 159,378
Corporate debt securities |  |
Schedule of Available-for-sale Securities |  |
Amortized Cost | 9,000 | 9,000
Gross Unrealized Gains | 0 | 79
Gross Unrealized Losses | (751) | (35)
Available-for-sale debt securities | $ 8,249 | $ 9,044

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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=82897076&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=82897076&loc=d3e27161-111563 + Details
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