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Investment Securities - Narrative (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 USD ($) position | Dec. 31, 2020 USD ($) position | Dec. 31, 2019 USD ($)
Debt Securities, Available-for-sale [Line Items] |  |  |
Loss upon acquisition of interest-only GNMA securities | $ 0 | $ 0 | $ 7,476
Proceeds from Sale of Debt Securities, Available-for-sale | 689,856 | 387,810 | 97,555
Net proceeds from sales of (purchases of) FHLB, Federal Reserve Bank, and other restricted stock | 6,784 | 12,846 | 5,471
Proceeds from sales of foreign subsidiaries | 3,765 | 0 | 0
Loss on sale of foreign subsidiaries | 2,840 | 0 | 0
Unrealized gain (loss) on investment securities | 2,720 | 1,447 | 1,299
Realized gains from sale of AFS debt securities | $ 31,400 | $ 20,100 | 1,000
Number of available for sale debt securities in an unrealized loss position less than 12 months (position) | position | 115 |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions 12 Months or More | position | 2 |  |
Number of available for sale debt securities in an unrealized loss position 12 months or more (position) | position | 117 | 16 |
Pledged investment securities fair value | $ 11,300 | $ 18,800 |
Unrealized gain (loss) on investment securities | $ 2,720 | 1,447 | 1,299
Interest-only GNMA securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Loss upon acquisition of interest-only GNMA securities |  |  | 7,500
Interest-only GNMA securities |  |  | $ 16,300
Proceeds from Sale of Debt Securities, Available-for-sale |  | 15,400 |
Debt securities, realized gain |  | $ 1,000 |

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- Definition Amount of realized gain 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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27357-111563 + Details
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