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Investment Securities - Narrative (Details)
$ in Thousands
 12 Months Ended
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