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Securities - Amortized cost and fair value by contractual maturity (Details) - USD ($) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Amortized Cost |  |  |  |
Due after five years through ten years |  | $ 140,439,000 |  |
Due after ten years |  | 1,679,462,000 |  |
Total |  | 1,819,901,000 | $ 955,542,000 |
Fair Value |  |  |  |
Due after five years through ten years |  | 135,931,000 |  |
Due after ten years |  | 1,642,133,000 |  |
Fair Value |  | 1,778,064,000 | 957,183,000 |
Amortized Cost |  |  |  |
Due in one year or less |  | 7,263,000 |  |
Due after one year through five years |  | 132,157,000 |  |
Due after five years through ten years |  | 920,768,000 |  |
Due after ten years |  | 4,161,108,000 |  |
Amortized Cost |  | 5,221,296,000 | 3,268,037,000 |
Fair Value |  |  |  |
Due in one year or less |  | 7,296,000 |  |
Due after one year through five years |  | 133,418,000 |  |
Due after five years through ten years |  | 919,669,000 |  |
Due after ten years |  | 4,133,095,000 |  |
Fair Value |  | 5,193,478,000 | 3,330,672,000 |
Information with respect to sales of available-for-sale securities |  |  |  |
Sale proceeds |  | 151,314,000 | 100,754,000 | $ 242,733,000
Gross realized gains |  | 750,000 | 662,000 | 6,030,000
Gross realized losses |  | (648,000) | (612,000) | (3,319,000)
Net realized gain |  | 102,000 | 50,000 | 2,711,000
Information with respect to sales of held-to-maturity |  |  |  |
Proceeds from sales of investment securities held to maturity |  | $ 0 | $ 0 | 0
VISA Class B Shares |  |  |  |
Information with respect to sales of available-for-sale securities |  |  |  |
Net realized gain | $ 5,400,000 |  |  | $ 2,700,000

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