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Investments - Carrying value and estimated fair value (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Schedule of Available-for-sale Securities |  |
Amortized Cost | $ 1,231,730 | $ 1,098,373
Gross Unrealized Gains | 2,385 | 20,373
Gross Unrealized Losses | (72,359) | (9,538)
Available-for-sale debt securities | 1,161,756 | 1,109,208
U.S. Government agencies |  |
Schedule of Available-for-sale Securities |  |
Amortized Cost | 356 | 373
Gross Unrealized Gains | 0 | 6
Gross Unrealized Losses | (12) | 0
Available-for-sale debt securities | 344 | 379
U.S. Treasury securities |  |
Schedule of Available-for-sale Securities |  |
Amortized Cost | 9,988 | 9,988
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (730) | (63)
Available-for-sale debt securities | 9,258 | 9,925
Obligations of states and political subdivisions |  |
Schedule of Available-for-sale Securities |  |
Amortized Cost | 438,990 | 512,952
Gross Unrealized Gains | 1,543 | 16,703
Gross Unrealized Losses | (31,404) | (3,188)
Available-for-sale debt securities | 409,129 | 526,467
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations |  |
Schedule of Available-for-sale Securities |  |
Amortized Cost | 226,466 | 213,471
Gross Unrealized Gains | 329 | 2,245
Gross Unrealized Losses | (5,491) | (1,277)
Available-for-sale debt securities | 221,304 | 214,439
Private label mortgage and asset backed securities |  |
Schedule of Available-for-sale Securities |  |
Amortized Cost | 508,430 | 317,089
Gross Unrealized Gains | 308 | 824
Gross Unrealized Losses | (32,925) | (4,693)
Available-for-sale debt securities | 475,813 | 313,220
Corporate debt securities |  |
Schedule of Available-for-sale Securities |  |
Amortized Cost | 47,500 | 44,500
Gross Unrealized Gains | 205 | 595
Gross Unrealized Losses | (1,797) | (317)
Available-for-sale debt securities | $ 45,908 | $ 44,778

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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=123581744&loc=d3e27161-111563 + Details
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