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Investments - Unrealized losses (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
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Schedule of Available-for-sale Securities |  |
Less than 12 Months, Fair Value | $ 926,452 | $ 496,816
Less than 12 Months, Unrealized Losses | (62,862) | (7,842)
12 Months or More, Fair Value | 115,013 | 75,609
12 Months or More, Unrealized Losses | (9,497) | (1,696)
Total Fair Value | 1,041,465 | 572,425
Total Unrealized Losses | (72,359) | (9,538)
U.S. Government agencies |  |
Schedule of Available-for-sale Securities |  |
Less than 12 Months, Fair Value | 343 |
Less than 12 Months, Unrealized Losses | (12) |
12 Months or More, Fair Value | 0 |
12 Months or More, Unrealized Losses | 0 |
Total Fair Value | 343 |
Total Unrealized Losses | (12) |
Obligations of states and political subdivisions |  |
Schedule of Available-for-sale Securities |  |
Less than 12 Months, Fair Value | 366,394 | 143,336
Less than 12 Months, Unrealized Losses | (27,627) | (2,896)
12 Months or More, Fair Value | 19,762 | 6,336
12 Months or More, Unrealized Losses | (3,777) | (292)
Total Fair Value | 386,156 | 149,672
Total Unrealized Losses | (31,404) | (3,188)
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations |  |
Schedule of Available-for-sale Securities |  |
Less than 12 Months, Fair Value | 119,477 | 91,385
Less than 12 Months, Unrealized Losses | (3,945) | (905)
12 Months or More, Fair Value | 45,880 | 40,365
12 Months or More, Unrealized Losses | (1,546) | (372)
Total Fair Value | 165,357 | 131,750
Total Unrealized Losses | (5,491) | (1,277)
Private label mortgage and asset backed securities |  |
Schedule of Available-for-sale Securities |  |
Less than 12 Months, Fair Value | 394,277 | 230,987
Less than 12 Months, Unrealized Losses | (28,751) | (3,661)
12 Months or More, Fair Value | 49,371 | 28,908
12 Months or More, Unrealized Losses | (4,174) | (1,032)
Total Fair Value | 443,648 | 259,895
Total Unrealized Losses | (32,925) | (4,693)
Corporate debt securities |  |
Schedule of Available-for-sale Securities |  |
Less than 12 Months, Fair Value | 36,703 | 21,183
Less than 12 Months, Unrealized Losses | (1,797) | (317)
12 Months or More, Fair Value | 0 | 0
12 Months or More, Unrealized Losses | 0 | 0
Total Fair Value | 36,703 | 21,183
Total Unrealized Losses | (1,797) | $ (317)
U.S. Treasury securities |  |
Schedule of Available-for-sale Securities |  |
Less than 12 Months, Fair Value | 9,258 |
Less than 12 Months, Unrealized Losses | (730) |
12 Months or More, Fair Value | 0 |
12 Months or More, Unrealized Losses | 0 |
Total Fair Value | 9,258 |
Total Unrealized Losses | $ (730) |

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