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Investments - Carrying value and estimated fair value (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Apr. 01, 2022 | Dec. 31, 2021
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Schedule of Available-for-sale Securities |  |  |
Debt securities, amortized cost | $ 790,492 |  | $ 1,098,373
Gross Unrealized Gains | 226 |  | 20,373
Gross Unrealized Losses | (80,237) |  | (9,538)
Available-for-sale debt securities | 710,481 |  | 1,109,208
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date | 305,902 |  | 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 27 |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (21,667) | $ (25,300) |
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value | 284,262 |  |
U.S. Government agencies |  |  |
Schedule of Available-for-sale Securities |  |  |
Debt securities, amortized cost | 352 |  | 373
Gross Unrealized Gains | 0 |  | 6
Gross Unrealized Losses | (19) |  | 0
Available-for-sale debt securities | 333 |  | 379
U.S. Treasury securities |  |  |
Schedule of Available-for-sale Securities |  |  |
Debt securities, amortized cost | 9,989 |  | 9,988
Gross Unrealized Gains | 0 |  | 0
Gross Unrealized Losses | (1,058) |  | (63)
Available-for-sale debt securities | 8,931 |  | 9,925
Obligations of states and political subdivisions |  |  |
Schedule of Available-for-sale Securities |  |  |
Debt securities, amortized cost | 220,750 |  | 512,952
Gross Unrealized Gains | 39 |  | 16,703
Gross Unrealized Losses | (27,360) |  | (3,188)
Available-for-sale debt securities | 193,429 |  | 526,467
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date | 191,951 |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 26 |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (16,663) |  |
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value | 175,314 |  |
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations |  |  |
Schedule of Available-for-sale Securities |  |  |
Debt securities, amortized cost | 128,996 |  | 213,471
Gross Unrealized Gains | 19 |  | 2,245
Gross Unrealized Losses | (6,563) |  | (1,277)
Available-for-sale debt securities | 122,452 |  | 214,439
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date | 10,269 |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (752) |  |
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value | 9,517 |  |
Private label mortgage and asset backed securities |  |  |
Schedule of Available-for-sale Securities |  |  |
Debt securities, amortized cost | 430,405 |  | 317,089
Gross Unrealized Gains | 168 |  | 824
Gross Unrealized Losses | (45,237) |  | (4,693)
Available-for-sale debt securities | 385,336 |  | 313,220
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date | 57,750 |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (3,319) |  |
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value | 54,431 |  |
Corporate debt securities |  |  |
Schedule of Available-for-sale Securities |  |  |
Debt securities, amortized cost |  |  | 44,500
Gross Unrealized Gains |  |  | 595
Gross Unrealized Losses |  |  | (317)
Available-for-sale debt securities |  |  | $ 44,778
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date | 45,932 |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 1 |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (933) |  |
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value | $ 45,000 |  |

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